#subductionzone — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #subductionzone, aggregated by home.social.
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Seismic study reveals hidden #megathrust #earthquake risk off #BritishColumbia
by Francesco Fiondella, Earth Institute at Columbia University
July 21, 2025"A new study published in Science Advances has revealed the first detailed images of a newly developing #SubductionZone off the coast of British Columbia's Haida Gwaii archipelago.
"The international team of researchers collected the data for this study during a 2021 cruise by the Lamont-Doherty Earth Observatory's research vessel, the Marcus G. Langseth. They used a 15-kilometer-long underwater cable equipped with thousands of underwater microphones, called hydrophones, in the area off northern British Columbia to map the deep structure of Earth's subsurface.
"Their data confirmed that the #QueenCharlotteFaultSystem can generate powerful megathrust earthquakes, which are capable of producing strong shaking and #tsunamis.
"Megathrusts are found in areas where one tectonic plate dives beneath another, in this case the Pacific plate being pushed under the North American plate. This area is known for generating powerful tremors. In fact, the Queen Charlotte fault system represents the greatest seismic hazard in Canada, producing the country's largest recorded earthquake in 1949 and a notable earthquake in 2012 that created a tsunami.
" 'This region is actively becoming a subduction zone, so understanding the fault structure here tells us about the early stages of subduction zone development,' says lead author Collin Brandl, a postdoctoral research scientist at the Lamont-Doherty Earth Observatory, part of the Columbia Climate School.
" 'Our study provides the first direct observations of the Haida Gwaii thrust, the 'megathrust' of this system, which can help improve hazard analysis in the region, better preparing residents for future earthquakes and tsunamis.' "
Source:
https://phys.org/news/2025-07-seismic-reveals-hidden-megathrust-earthquake.html -
Seismic study reveals hidden #megathrust #earthquake risk off #BritishColumbia
by Francesco Fiondella, Earth Institute at Columbia University
July 21, 2025"A new study published in Science Advances has revealed the first detailed images of a newly developing #SubductionZone off the coast of British Columbia's Haida Gwaii archipelago.
"The international team of researchers collected the data for this study during a 2021 cruise by the Lamont-Doherty Earth Observatory's research vessel, the Marcus G. Langseth. They used a 15-kilometer-long underwater cable equipped with thousands of underwater microphones, called hydrophones, in the area off northern British Columbia to map the deep structure of Earth's subsurface.
"Their data confirmed that the #QueenCharlotteFaultSystem can generate powerful megathrust earthquakes, which are capable of producing strong shaking and #tsunamis.
"Megathrusts are found in areas where one tectonic plate dives beneath another, in this case the Pacific plate being pushed under the North American plate. This area is known for generating powerful tremors. In fact, the Queen Charlotte fault system represents the greatest seismic hazard in Canada, producing the country's largest recorded earthquake in 1949 and a notable earthquake in 2012 that created a tsunami.
" 'This region is actively becoming a subduction zone, so understanding the fault structure here tells us about the early stages of subduction zone development,' says lead author Collin Brandl, a postdoctoral research scientist at the Lamont-Doherty Earth Observatory, part of the Columbia Climate School.
" 'Our study provides the first direct observations of the Haida Gwaii thrust, the 'megathrust' of this system, which can help improve hazard analysis in the region, better preparing residents for future earthquakes and tsunamis.' "
Source:
https://phys.org/news/2025-07-seismic-reveals-hidden-megathrust-earthquake.html -
Seismic study reveals hidden #megathrust #earthquake risk off #BritishColumbia
by Francesco Fiondella, Earth Institute at Columbia University
July 21, 2025"A new study published in Science Advances has revealed the first detailed images of a newly developing #SubductionZone off the coast of British Columbia's Haida Gwaii archipelago.
"The international team of researchers collected the data for this study during a 2021 cruise by the Lamont-Doherty Earth Observatory's research vessel, the Marcus G. Langseth. They used a 15-kilometer-long underwater cable equipped with thousands of underwater microphones, called hydrophones, in the area off northern British Columbia to map the deep structure of Earth's subsurface.
"Their data confirmed that the #QueenCharlotteFaultSystem can generate powerful megathrust earthquakes, which are capable of producing strong shaking and #tsunamis.
"Megathrusts are found in areas where one tectonic plate dives beneath another, in this case the Pacific plate being pushed under the North American plate. This area is known for generating powerful tremors. In fact, the Queen Charlotte fault system represents the greatest seismic hazard in Canada, producing the country's largest recorded earthquake in 1949 and a notable earthquake in 2012 that created a tsunami.
" 'This region is actively becoming a subduction zone, so understanding the fault structure here tells us about the early stages of subduction zone development,' says lead author Collin Brandl, a postdoctoral research scientist at the Lamont-Doherty Earth Observatory, part of the Columbia Climate School.
" 'Our study provides the first direct observations of the Haida Gwaii thrust, the 'megathrust' of this system, which can help improve hazard analysis in the region, better preparing residents for future earthquakes and tsunamis.' "
Source:
https://phys.org/news/2025-07-seismic-reveals-hidden-megathrust-earthquake.html -
Seismic study reveals hidden #megathrust #earthquake risk off #BritishColumbia
by Francesco Fiondella, Earth Institute at Columbia University
July 21, 2025"A new study published in Science Advances has revealed the first detailed images of a newly developing #SubductionZone off the coast of British Columbia's Haida Gwaii archipelago.
"The international team of researchers collected the data for this study during a 2021 cruise by the Lamont-Doherty Earth Observatory's research vessel, the Marcus G. Langseth. They used a 15-kilometer-long underwater cable equipped with thousands of underwater microphones, called hydrophones, in the area off northern British Columbia to map the deep structure of Earth's subsurface.
"Their data confirmed that the #QueenCharlotteFaultSystem can generate powerful megathrust earthquakes, which are capable of producing strong shaking and #tsunamis.
"Megathrusts are found in areas where one tectonic plate dives beneath another, in this case the Pacific plate being pushed under the North American plate. This area is known for generating powerful tremors. In fact, the Queen Charlotte fault system represents the greatest seismic hazard in Canada, producing the country's largest recorded earthquake in 1949 and a notable earthquake in 2012 that created a tsunami.
" 'This region is actively becoming a subduction zone, so understanding the fault structure here tells us about the early stages of subduction zone development,' says lead author Collin Brandl, a postdoctoral research scientist at the Lamont-Doherty Earth Observatory, part of the Columbia Climate School.
" 'Our study provides the first direct observations of the Haida Gwaii thrust, the 'megathrust' of this system, which can help improve hazard analysis in the region, better preparing residents for future earthquakes and tsunamis.' "
Source:
https://phys.org/news/2025-07-seismic-reveals-hidden-megathrust-earthquake.html -
Seismic study reveals hidden #megathrust #earthquake risk off #BritishColumbia
by Francesco Fiondella, Earth Institute at Columbia University
July 21, 2025"A new study published in Science Advances has revealed the first detailed images of a newly developing #SubductionZone off the coast of British Columbia's Haida Gwaii archipelago.
"The international team of researchers collected the data for this study during a 2021 cruise by the Lamont-Doherty Earth Observatory's research vessel, the Marcus G. Langseth. They used a 15-kilometer-long underwater cable equipped with thousands of underwater microphones, called hydrophones, in the area off northern British Columbia to map the deep structure of Earth's subsurface.
"Their data confirmed that the #QueenCharlotteFaultSystem can generate powerful megathrust earthquakes, which are capable of producing strong shaking and #tsunamis.
"Megathrusts are found in areas where one tectonic plate dives beneath another, in this case the Pacific plate being pushed under the North American plate. This area is known for generating powerful tremors. In fact, the Queen Charlotte fault system represents the greatest seismic hazard in Canada, producing the country's largest recorded earthquake in 1949 and a notable earthquake in 2012 that created a tsunami.
" 'This region is actively becoming a subduction zone, so understanding the fault structure here tells us about the early stages of subduction zone development,' says lead author Collin Brandl, a postdoctoral research scientist at the Lamont-Doherty Earth Observatory, part of the Columbia Climate School.
" 'Our study provides the first direct observations of the Haida Gwaii thrust, the 'megathrust' of this system, which can help improve hazard analysis in the region, better preparing residents for future earthquakes and tsunamis.' "
Source:
https://phys.org/news/2025-07-seismic-reveals-hidden-megathrust-earthquake.html -
#Cascadia #SubductionZone #earthquakes
"When an earthquake rips along the Cascadia Subduction Zone fault, much of the U.S. West Coast could shake violently for five minutes, and tsunami waves as tall as 100 feet could barrel toward shore. But that’s just the start of the expected horrors.
Even if coastal towns in Northern California, Oregon and Washington withstand that seismic onslaught, new research suggests, floodwaters could seep into many of these vulnerable communities for good. That’s because entire coastal shorelines are expected to drop by as much as 6½ feet when the earthquake strikes, according to new research published Monday in the Proceedings of the National Academy of Sciences."
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Unexpected And Unexplained Structures Found Deep Below The Pacific Ocean
There are zones where the seismic waves move in different ways, suggesting structures that are colder or have a different composition than the surrounding molten rock.
It is unclear what these structures are. If they were anywhere else, they could be portions of #tectonicplates that have sunk in a #subductionzone. But the Pacific is one large plate, so there should be no subduction material under it. https://www.iflscience.com/unexpected-and-unexplained-structures-found-deep-below-the-pacific-ocean-77545 -
Thermodynamic Model Identifies How Gold Reaches Earth's Surface
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https://phys.org/news/2024-12-thermodynamic-gold-earth-surface.html <-- shared technical article
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https://doi.org/10.1073/pnas.2404731121 <-- shared paper
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#geology #structuralgeology #mantle #crust #tectonics #platetectonics #gold #preciousmetals #subduction #mantle #crust #sulfur #RingOfFire #volcano #volcanics #magma #model #modeling #trisulfur #pressure #temperature #geochemistry #subductionzone #thermodynamics -
Thermodynamic Model Identifies How Gold Reaches Earth's Surface
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https://phys.org/news/2024-12-thermodynamic-gold-earth-surface.html <-- shared technical article
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https://doi.org/10.1073/pnas.2404731121 <-- shared paper
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#geology #structuralgeology #mantle #crust #tectonics #platetectonics #gold #preciousmetals #subduction #mantle #crust #sulfur #RingOfFire #volcano #volcanics #magma #model #modeling #trisulfur #pressure #temperature #geochemistry #subductionzone #thermodynamics -
Thermodynamic Model Identifies How Gold Reaches Earth's Surface
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https://phys.org/news/2024-12-thermodynamic-gold-earth-surface.html <-- shared technical article
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https://doi.org/10.1073/pnas.2404731121 <-- shared paper
--
#geology #structuralgeology #mantle #crust #tectonics #platetectonics #gold #preciousmetals #subduction #mantle #crust #sulfur #RingOfFire #volcano #volcanics #magma #model #modeling #trisulfur #pressure #temperature #geochemistry #subductionzone #thermodynamics -
Thermodynamic Model Identifies How Gold Reaches Earth's Surface
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https://phys.org/news/2024-12-thermodynamic-gold-earth-surface.html <-- shared technical article
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https://doi.org/10.1073/pnas.2404731121 <-- shared paper
--
#geology #structuralgeology #mantle #crust #tectonics #platetectonics #gold #preciousmetals #subduction #mantle #crust #sulfur #RingOfFire #volcano #volcanics #magma #model #modeling #trisulfur #pressure #temperature #geochemistry #subductionzone #thermodynamics -
Thermodynamic Model Identifies How Gold Reaches Earth's Surface
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https://phys.org/news/2024-12-thermodynamic-gold-earth-surface.html <-- shared technical article
--
https://doi.org/10.1073/pnas.2404731121 <-- shared paper
--
#geology #structuralgeology #mantle #crust #tectonics #platetectonics #gold #preciousmetals #subduction #mantle #crust #sulfur #RingOfFire #volcano #volcanics #magma #model #modeling #trisulfur #pressure #temperature #geochemistry #subductionzone #thermodynamics -
#Geologists Uncover Mysterious Hidden #SubductionZone Beneath #Pacific, Offering A Glimpse into Earth's Ancient Interior
This discovery reveals a hidden chapter of Earth’s history that reshapes our understanding of the planet’s inner workings. This hidden tectonic boundary, buried over 250 million years ago, challenges prevailing theories about Earth’s interior structure and offers insights into how the planet’s surface has evolved over millennia.
https://thedebrief.org/geologists-uncover-mysterious-hidden-subduction-zone-beneath-pacific-offering-a-glimpse-into-earths-ancient-interior/ -
The West Coast Is at Risk: New Megathrust Fault Research Indicates That the Next Big Earthquake Could Be Imminent
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Randomness Of Megathrust Earthquakes Implied By Rapid Stress Recovery After The Japan Earthquake
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https://doi.org/10.1038/ngeo2343 <-- shared (2015) paper
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#GIS #spatial #mapping #model #modeling #earthquake #japan #subduction #subductionzone #geology #risk #hazard #engineeringgeology #structuralgeology #subsurface #3dmodel #spatialanalysis #spatiotemporal #megathrust #japanese #Tohoku #Tohoku2011 #tectonics #platetectonics #plates #stress #stressrelease #rupture #quake -
Randomness Of Megathrust Earthquakes Implied By Rapid Stress Recovery After The Japan Earthquake
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https://doi.org/10.1038/ngeo2343 <-- shared (2015) paper
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#GIS #spatial #mapping #model #modeling #earthquake #japan #subduction #subductionzone #geology #risk #hazard #engineeringgeology #structuralgeology #subsurface #3dmodel #spatialanalysis #spatiotemporal #megathrust #japanese #Tohoku #Tohoku2011 #tectonics #platetectonics #plates #stress #stressrelease #rupture #quake -
Randomness Of Megathrust Earthquakes Implied By Rapid Stress Recovery After The Japan Earthquake
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https://doi.org/10.1038/ngeo2343 <-- shared (2015) paper
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#GIS #spatial #mapping #model #modeling #earthquake #japan #subduction #subductionzone #geology #risk #hazard #engineeringgeology #structuralgeology #subsurface #3dmodel #spatialanalysis #spatiotemporal #megathrust #japanese #Tohoku #Tohoku2011 #tectonics #platetectonics #plates #stress #stressrelease #rupture #quake -
Randomness Of Megathrust Earthquakes Implied By Rapid Stress Recovery After The Japan Earthquake
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https://doi.org/10.1038/ngeo2343 <-- shared (2015) paper
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#GIS #spatial #mapping #model #modeling #earthquake #japan #subduction #subductionzone #geology #risk #hazard #engineeringgeology #structuralgeology #subsurface #3dmodel #spatialanalysis #spatiotemporal #megathrust #japanese #Tohoku #Tohoku2011 #tectonics #platetectonics #plates #stress #stressrelease #rupture #quake -
Randomness Of Megathrust Earthquakes Implied By Rapid Stress Recovery After The Japan Earthquake
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https://doi.org/10.1038/ngeo2343 <-- shared (2015) paper
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#GIS #spatial #mapping #model #modeling #earthquake #japan #subduction #subductionzone #geology #risk #hazard #engineeringgeology #structuralgeology #subsurface #3dmodel #spatialanalysis #spatiotemporal #megathrust #japanese #Tohoku #Tohoku2011 #tectonics #platetectonics #plates #stress #stressrelease #rupture #quake -
What causes onshore faults to slip in subduction zones?
Well, it turns out that the commonly held reason does not apply to the faults located in northern Cascadia.
Read Harrichhausen et al. to find out why: https://seismica.library.mcgill.ca/article/view/1177
#cascadia #SubductionZone #Seismology #earthquakescience #peerreviewed #DiamondOpenAccess #earthquake #OpenAccess #OpenScience
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The publications for the Cascadia Subduction Zone special issue are starting to come out, check them out here:
https://seismica.library.mcgill.ca/issue/view/91Don’t miss out on contributing to this Seismica special issue!
Scope, topics, publication types, and conditions:
https://seismica.library.mcgill.ca/announcement/view/17#cascadia #SubductionZone #OpenAccess #DiamondOpenAccess #peerreviewed #Seismology #earthquake #EarthquakeScience
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Is there any evidence of Slow Slip Events in the southern Peru-northern Chile subduction zone?
Yes, Jara et al. find tiny events hidden in the geodetic noise. Read more to see how they detected and characterized them:
https://seismica.library.mcgill.ca/article/view/980#Chile #Peru #Seismology #EarthquakeScience #SubductionZone #SlowSlip #peerreviewed #DiamondOpenAccess #Earthquake #OpenAccess #OpenScience
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Is there any evidence of Slow Slip Events in the southern Peru-northern Chile subduction zone?
Yes, Jara et al. find tiny events hidden in the geodetic noise. Read more to see how they detected and characterized them:
https://seismica.library.mcgill.ca/article/view/980#Chile #Peru #Seismology #EarthquakeScience #SubductionZone #SlowSlip #peerreviewed #DiamondOpenAccess #Earthquake #OpenAccess #OpenScience
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Is there any evidence of Slow Slip Events in the southern Peru-northern Chile subduction zone?
Yes, Jara et al. find tiny events hidden in the geodetic noise. Read more to see how they detected and characterized them:
https://seismica.library.mcgill.ca/article/view/980#Chile #Peru #Seismology #EarthquakeScience #SubductionZone #SlowSlip #peerreviewed #DiamondOpenAccess #Earthquake #OpenAccess #OpenScience
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Is there any evidence of Slow Slip Events in the southern Peru-northern Chile subduction zone?
Yes, Jara et al. find tiny events hidden in the geodetic noise. Read more to see how they detected and characterized them:
https://seismica.library.mcgill.ca/article/view/980#Chile #Peru #Seismology #EarthquakeScience #SubductionZone #SlowSlip #peerreviewed #DiamondOpenAccess #Earthquake #OpenAccess #OpenScience
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Is there any evidence of Slow Slip Events in the southern Peru-northern Chile subduction zone?
Yes, Jara et al. find tiny events hidden in the geodetic noise. Read more to see how they detected and characterized them:
https://seismica.library.mcgill.ca/article/view/980#Chile #Peru #Seismology #EarthquakeScience #SubductionZone #SlowSlip #peerreviewed #DiamondOpenAccess #Earthquake #OpenAccess #OpenScience
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Hikurangi Subduction Zone - The Burning Question About NZ’s Biggest Quake-Maker
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https://www.nzherald.co.nz/nz/hikurangi-subduction-zone-the-burning-question-about-nzs-biggest-quake-maker/TPYTCPZLIVF3XPGHB4DUP6U2NM/ <-- shared media article
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https://doi.org/10.1029/2023GL103696 <-- shared paper
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#GIS #spatial #mapping #NewZealand #remotesensing #geophysics #earthquake #faulting #subduction #platetectonics #risk #hazard #Gisborne #EastCape #Raukumara #stress #testing #sampling #Hikurangi #margin #geology #structuralgeology #model #modeling #permeability #porosity #testing #mudrocks #accretionaryprism #slowslipearthquakes #SSE #mantle #subductionzone #mechanics #stressrelief #pressurevalve -
Hikurangi Subduction Zone - The Burning Question About NZ’s Biggest Quake-Maker
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https://www.nzherald.co.nz/nz/hikurangi-subduction-zone-the-burning-question-about-nzs-biggest-quake-maker/TPYTCPZLIVF3XPGHB4DUP6U2NM/ <-- shared media article
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https://doi.org/10.1029/2023GL103696 <-- shared paper
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#GIS #spatial #mapping #NewZealand #remotesensing #geophysics #earthquake #faulting #subduction #platetectonics #risk #hazard #Gisborne #EastCape #Raukumara #stress #testing #sampling #Hikurangi #margin #geology #structuralgeology #model #modeling #permeability #porosity #testing #mudrocks #accretionaryprism #slowslipearthquakes #SSE #mantle #subductionzone #mechanics #stressrelief #pressurevalve -
Hikurangi Subduction Zone - The Burning Question About NZ’s Biggest Quake-Maker
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https://www.nzherald.co.nz/nz/hikurangi-subduction-zone-the-burning-question-about-nzs-biggest-quake-maker/TPYTCPZLIVF3XPGHB4DUP6U2NM/ <-- shared media article
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https://doi.org/10.1029/2023GL103696 <-- shared paper
--
#GIS #spatial #mapping #NewZealand #remotesensing #geophysics #earthquake #faulting #subduction #platetectonics #risk #hazard #Gisborne #EastCape #Raukumara #stress #testing #sampling #Hikurangi #margin #geology #structuralgeology #model #modeling #permeability #porosity #testing #mudrocks #accretionaryprism #slowslipearthquakes #SSE #mantle #subductionzone #mechanics #stressrelief #pressurevalve -
Hikurangi Subduction Zone - The Burning Question About NZ’s Biggest Quake-Maker
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https://www.nzherald.co.nz/nz/hikurangi-subduction-zone-the-burning-question-about-nzs-biggest-quake-maker/TPYTCPZLIVF3XPGHB4DUP6U2NM/ <-- shared media article
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https://doi.org/10.1029/2023GL103696 <-- shared paper
--
#GIS #spatial #mapping #NewZealand #remotesensing #geophysics #earthquake #faulting #subduction #platetectonics #risk #hazard #Gisborne #EastCape #Raukumara #stress #testing #sampling #Hikurangi #margin #geology #structuralgeology #model #modeling #permeability #porosity #testing #mudrocks #accretionaryprism #slowslipearthquakes #SSE #mantle #subductionzone #mechanics #stressrelief #pressurevalve -
Hikurangi Subduction Zone - The Burning Question About NZ’s Biggest Quake-Maker
--
https://www.nzherald.co.nz/nz/hikurangi-subduction-zone-the-burning-question-about-nzs-biggest-quake-maker/TPYTCPZLIVF3XPGHB4DUP6U2NM/ <-- shared media article
--
https://doi.org/10.1029/2023GL103696 <-- shared paper
--
#GIS #spatial #mapping #NewZealand #remotesensing #geophysics #earthquake #faulting #subduction #platetectonics #risk #hazard #Gisborne #EastCape #Raukumara #stress #testing #sampling #Hikurangi #margin #geology #structuralgeology #model #modeling #permeability #porosity #testing #mudrocks #accretionaryprism #slowslipearthquakes #SSE #mantle #subductionzone #mechanics #stressrelief #pressurevalve -
The 60th Anniversary Of The M9.2 Alaska Earthquake And Tsunami Of March 27, 1964
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https://earthquake.usgs.gov/earthquakes/events/alaska1964/ <-- USGS page with details
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https://pubs.usgs.gov/fs/2014/3018/ <-- USGS publication, The 1964 Great Alaska Earthquake and Tsunamis—A Modern Perspective and Enduring Legacies
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#GIS #spatial #mapping #risk #hazard #earthquake #Anchorage #Alaska #record #tsunami #damage #anniversary #lossoflife #publicsafety #fault #faulting #geologichazard #naturaldisaster #disaster #naturalahazard #publichealth #publicsafety #disasterresponse #monitoring #model #modeling #massmovement #grounddeformation #engineering #death #damage #propertydamage #subductionzone #structuralgeology #riskmanagement #engineeringdesign #earthscience #GreatAlaskaEarthquake #earthquakepreparedness -
The 60th Anniversary Of The M9.2 Alaska Earthquake And Tsunami Of March 27, 1964
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https://earthquake.usgs.gov/earthquakes/events/alaska1964/ <-- USGS page with details
--
https://pubs.usgs.gov/fs/2014/3018/ <-- USGS publication, The 1964 Great Alaska Earthquake and Tsunamis—A Modern Perspective and Enduring Legacies
--
#GIS #spatial #mapping #risk #hazard #earthquake #Anchorage #Alaska #record #tsunami #damage #anniversary #lossoflife #publicsafety #fault #faulting #geologichazard #naturaldisaster #disaster #naturalahazard #publichealth #publicsafety #disasterresponse #monitoring #model #modeling #massmovement #grounddeformation #engineering #death #damage #propertydamage #subductionzone #structuralgeology #riskmanagement #engineeringdesign #earthscience #GreatAlaskaEarthquake #earthquakepreparedness -
The 60th Anniversary Of The M9.2 Alaska Earthquake And Tsunami Of March 27, 1964
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https://earthquake.usgs.gov/earthquakes/events/alaska1964/ <-- USGS page with details
--
https://pubs.usgs.gov/fs/2014/3018/ <-- USGS publication, The 1964 Great Alaska Earthquake and Tsunamis—A Modern Perspective and Enduring Legacies
--
#GIS #spatial #mapping #risk #hazard #earthquake #Anchorage #Alaska #record #tsunami #damage #anniversary #lossoflife #publicsafety #fault #faulting #geologichazard #naturaldisaster #disaster #naturalahazard #publichealth #publicsafety #disasterresponse #monitoring #model #modeling #massmovement #grounddeformation #engineering #death #damage #propertydamage #subductionzone #structuralgeology #riskmanagement #engineeringdesign #earthscience #GreatAlaskaEarthquake #earthquakepreparedness -
The 60th Anniversary Of The M9.2 Alaska Earthquake And Tsunami Of March 27, 1964
--
https://earthquake.usgs.gov/earthquakes/events/alaska1964/ <-- USGS page with details
--
https://pubs.usgs.gov/fs/2014/3018/ <-- USGS publication, The 1964 Great Alaska Earthquake and Tsunamis—A Modern Perspective and Enduring Legacies
--
#GIS #spatial #mapping #risk #hazard #earthquake #Anchorage #Alaska #record #tsunami #damage #anniversary #lossoflife #publicsafety #fault #faulting #geologichazard #naturaldisaster #disaster #naturalahazard #publichealth #publicsafety #disasterresponse #monitoring #model #modeling #massmovement #grounddeformation #engineering #death #damage #propertydamage #subductionzone #structuralgeology #riskmanagement #engineeringdesign #earthscience #GreatAlaskaEarthquake #earthquakepreparedness -
The 60th Anniversary Of The M9.2 Alaska Earthquake And Tsunami Of March 27, 1964
--
https://earthquake.usgs.gov/earthquakes/events/alaska1964/ <-- USGS page with details
--
https://pubs.usgs.gov/fs/2014/3018/ <-- USGS publication, The 1964 Great Alaska Earthquake and Tsunamis—A Modern Perspective and Enduring Legacies
--
#GIS #spatial #mapping #risk #hazard #earthquake #Anchorage #Alaska #record #tsunami #damage #anniversary #lossoflife #publicsafety #fault #faulting #geologichazard #naturaldisaster #disaster #naturalahazard #publichealth #publicsafety #disasterresponse #monitoring #model #modeling #massmovement #grounddeformation #engineering #death #damage #propertydamage #subductionzone #structuralgeology #riskmanagement #engineeringdesign #earthscience #GreatAlaskaEarthquake #earthquakepreparedness -
Magma And Mountain Building At The Columbia River Gorge
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https://www.earthscope.org/news/magma-and-mountain-building-at-the-columbia-river-gorge/ <-- shared technical article
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https://doi.org/10.1126/sciadv.adj3357 <-- shared paper
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#GIS #spatial #mapping #remotesensing #GPS #geophysics #subductionzone #plateboundary #PNW #Oregon #columbiariver #geology #structuralgeology #model #modeling #vulcanism #volcanic #magma #fieldwork #igneous #platetectonics #uplift #compression #extension #geologicmapping #geologic #orogeny #mountains #mountainbuilding -
Magma And Mountain Building At The Columbia River Gorge
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https://www.earthscope.org/news/magma-and-mountain-building-at-the-columbia-river-gorge/ <-- shared technical article
--
https://doi.org/10.1126/sciadv.adj3357 <-- shared paper
--
#GIS #spatial #mapping #remotesensing #GPS #geophysics #subductionzone #plateboundary #PNW #Oregon #columbiariver #geology #structuralgeology #model #modeling #vulcanism #volcanic #magma #fieldwork #igneous #platetectonics #uplift #compression #extension #geologicmapping #geologic #orogeny #mountains #mountainbuilding -
Magma And Mountain Building At The Columbia River Gorge
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https://www.earthscope.org/news/magma-and-mountain-building-at-the-columbia-river-gorge/ <-- shared technical article
--
https://doi.org/10.1126/sciadv.adj3357 <-- shared paper
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#GIS #spatial #mapping #remotesensing #GPS #geophysics #subductionzone #plateboundary #PNW #Oregon #columbiariver #geology #structuralgeology #model #modeling #vulcanism #volcanic #magma #fieldwork #igneous #platetectonics #uplift #compression #extension #geologicmapping #geologic #orogeny #mountains #mountainbuilding -
Magma And Mountain Building At The Columbia River Gorge
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https://www.earthscope.org/news/magma-and-mountain-building-at-the-columbia-river-gorge/ <-- shared technical article
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https://doi.org/10.1126/sciadv.adj3357 <-- shared paper
--
#GIS #spatial #mapping #remotesensing #GPS #geophysics #subductionzone #plateboundary #PNW #Oregon #columbiariver #geology #structuralgeology #model #modeling #vulcanism #volcanic #magma #fieldwork #igneous #platetectonics #uplift #compression #extension #geologicmapping #geologic #orogeny #mountains #mountainbuilding -
Magma And Mountain Building At The Columbia River Gorge
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https://www.earthscope.org/news/magma-and-mountain-building-at-the-columbia-river-gorge/ <-- shared technical article
--
https://doi.org/10.1126/sciadv.adj3357 <-- shared paper
--
#GIS #spatial #mapping #remotesensing #GPS #geophysics #subductionzone #plateboundary #PNW #Oregon #columbiariver #geology #structuralgeology #model #modeling #vulcanism #volcanic #magma #fieldwork #igneous #platetectonics #uplift #compression #extension #geologicmapping #geologic #orogeny #mountains #mountainbuilding -
Yani-Quiyuch et al. examine aftershocks of the 2022 Mw 6.2 earthquake in Guatemala, revealing these occurred on an intraplate fault between a double seismic zone, and identify normal and inverse focal mechanisms during the seismic sequence.
Read more: https://doi.org/10.26443/seismica.v2i2.691
#Seismology #EarthquakeScience #DiamondOpenAccess #earthquake #OpenAccess #openscience #guatemala #subductionzone
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Geoscientists Discover Massive Undersea Water Reservoir Off New Zealand’s Coast
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https://www.sci.news/othersciences/geophysics/hikurangi-water-reservoir-12323.html <-- shared technical article
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https://doi.org/10.1126/sciadv.adh0150 <-- shared paper
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#GIS #spatial #mapping #remotesensing #geology #structuralgeology #NewZealand #model #modeling #megathrust #fault #faulting #subduction #water #groundwater #Hikurangi #hydrogeology #igneous #vulcanism #volcaniclastic #seamounts #marine #bathymetry #seafloor #volcanicplateau #subductionzone #seismicimaging #seismic #earthquake #slowslip #tectonics #geoscience -
Geoscientists Discover Massive Undersea Water Reservoir Off New Zealand’s Coast
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https://www.sci.news/othersciences/geophysics/hikurangi-water-reservoir-12323.html <-- shared technical article
--
https://doi.org/10.1126/sciadv.adh0150 <-- shared paper
--
#GIS #spatial #mapping #remotesensing #geology #structuralgeology #NewZealand #model #modeling #megathrust #fault #faulting #subduction #water #groundwater #Hikurangi #hydrogeology #igneous #vulcanism #volcaniclastic #seamounts #marine #bathymetry #seafloor #volcanicplateau #subductionzone #seismicimaging #seismic #earthquake #slowslip #tectonics #geoscience -
Geoscientists Discover Massive Undersea Water Reservoir Off New Zealand’s Coast
--
https://www.sci.news/othersciences/geophysics/hikurangi-water-reservoir-12323.html <-- shared technical article
--
https://doi.org/10.1126/sciadv.adh0150 <-- shared paper
--
#GIS #spatial #mapping #remotesensing #geology #structuralgeology #NewZealand #model #modeling #megathrust #fault #faulting #subduction #water #groundwater #Hikurangi #hydrogeology #igneous #vulcanism #volcaniclastic #seamounts #marine #bathymetry #seafloor #volcanicplateau #subductionzone #seismicimaging #seismic #earthquake #slowslip #tectonics #geoscience -
Geoscientists Discover Massive Undersea Water Reservoir Off New Zealand’s Coast
--
https://www.sci.news/othersciences/geophysics/hikurangi-water-reservoir-12323.html <-- shared technical article
--
https://doi.org/10.1126/sciadv.adh0150 <-- shared paper
--
#GIS #spatial #mapping #remotesensing #geology #structuralgeology #NewZealand #model #modeling #megathrust #fault #faulting #subduction #water #groundwater #Hikurangi #hydrogeology #igneous #vulcanism #volcaniclastic #seamounts #marine #bathymetry #seafloor #volcanicplateau #subductionzone #seismicimaging #seismic #earthquake #slowslip #tectonics #geoscience -
Geoscientists Discover Massive Undersea Water Reservoir Off New Zealand’s Coast
--
https://www.sci.news/othersciences/geophysics/hikurangi-water-reservoir-12323.html <-- shared technical article
--
https://doi.org/10.1126/sciadv.adh0150 <-- shared paper
--
#GIS #spatial #mapping #remotesensing #geology #structuralgeology #NewZealand #model #modeling #megathrust #fault #faulting #subduction #water #groundwater #Hikurangi #hydrogeology #igneous #vulcanism #volcaniclastic #seamounts #marine #bathymetry #seafloor #volcanicplateau #subductionzone #seismicimaging #seismic #earthquake #slowslip #tectonics #geoscience -
The Wilson Cycle: Intro
“If the continents have moved, then they have drifted like rafts and formed the ocean floors in their wake. It is to this wake that we should look first.”
~ John Tuzo WilsonCanadian geophysicist and geologist, John Tuzo Wilson, posed the question (and the title of his article in 1966) - ‘Did the Atlantic close and then re-open?’ Spoiler alert - yes. That, and his many contributions to plate tectonics, including the concept of hotspots and transform faults, led to the Wilson Cycle (also known as the Supercontinent Cycle) being named after him.
The Wilson Cycle (WC) refers to the process of continent break-up and ocean-opening followed by subduction, collision, ocean-closing, and continent formation (see the diagram below). This can take tens to hundreds of millons of years (very deep time) to complete.
This quick video provides animation of the WC: https://youtu.be/I_q3sAcuzIY
Step 1 of the WC starts with a tectonically stable continent/craton, eroded down and perhaps scarred by earlier collisions. Rifting (or faulting), crustal thinning, and thermal uplift caused by tectonic stretching of the continent allows the upper mantle (plume) to rise up and fill in. This can lead to earthquakes and volcanic flows. Sometime the plume can die out leading to a failed rift, but when rifting continues, things get quite interesting.
Step 2 The fractures are deep and oriented perpendicular to the extensional direction. As the continent breaks apart, the plume develops convection cells that further the rifting and deepen the basin allowing water in. The mantle material exposed by the rifting is made of much denser (or mafic) material than continental crust (or felsic) and sinks, cools and hardens/crystallizes forming oceanic crust. A new ocean basin is created.
Step 3 The two new continents continue to drift apart; the rift becomes a young spreading ridge, and the new ocean crust sinks further into the mantle as it cools and becomes denser. Sediment is now collecting on the new ocean floors.
Step 4 The Mid Ocean Ridge (MOR) continues to create new ocean crust and the new ocean deepens as the oceanic crust matures and continues to sink into the mantle. The mature oceanic crust is much heavier than the bordering continental crust, and cracks can develop causing the oceanic crust to flex downwards forming a young subduction zone. Part of the oceanic crust is dragged deep into trench and the water-laden oceanic crust melts due to the higher temperatures of the mantle. Volcanic Island arcs are created. The rifted continental crust is now well below the surface of the ocean.
Step 5 Divergence ceases, and convergence begins. The MOR is eventually subducted, or consumed at the ocean basin margin. Associated volcanism and subduction continues, along with collision, narrowing the ocean and causing mountains to form. This is now part of the ocean-closing cycle.
Step 6 As the continents/cratons continue to collide, folding, faulting, and earthquakes occur creating new mountains (think of the Himalayas), while catching up bits of volcanic rock, oceanic crust and sedimentary rock. A new continent is formed.
Step 7 The continent matures and erodes. Rinse and repeat with continents colliding, eventually forming supercontinents, and dispersing again in a much longer and even deeper time.
The Wilson Cycle is somewhat simplified and doesn’t go into all the sorts of tectonic variations of rift zones and diversity of plate tectonics, but it was a landmark starting point and a sign of Wilson’s genius. Later geologists and geophysicists stand on the shoulders of this giant. We’ll dive further into the Wilson Cycle in future posts, and have a look at the rock types created and how geologists piece together the Wilson Cycle in real rocks. It’ll be fun she said :)
#WilsonCycle #JohnTuzoWilson #OceanicCrustFormation #Mantle #Plume #MidOceanRidge #SubductionZone #MountainForming #geology #ScienceMastodon @geology
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The Wilson Cycle: Intro
“If the continents have moved, then they have drifted like rafts and formed the ocean floors in their wake. It is to this wake that we should look first.”
~ John Tuzo WilsonCanadian geophysicist and geologist, John Tuzo Wilson, posed the question (and the title of his article in 1966) - ‘Did the Atlantic close and then re-open?’ Spoiler alert - yes. That, and his many contributions to plate tectonics, including the concept of hotspots and transform faults, led to the Wilson Cycle (also known as the Supercontinent Cycle) being named after him.
The Wilson Cycle (WC) refers to the process of continent break-up and ocean-opening followed by subduction, collision, ocean-closing, and continent formation (see the diagram below). This can take tens to hundreds of millons of years (very deep time) to complete.
This quick video provides animation of the WC: https://youtu.be/I_q3sAcuzIY
Step 1 of the WC starts with a tectonically stable continent/craton, eroded down and perhaps scarred by earlier collisions. Rifting (or faulting), crustal thinning, and thermal uplift caused by tectonic stretching of the continent allows the upper mantle (plume) to rise up and fill in. This can lead to earthquakes and volcanic flows. Sometime the plume can die out leading to a failed rift, but when rifting continues, things get quite interesting.
Step 2 The fractures are deep and oriented perpendicular to the extensional direction. As the continent breaks apart, the plume develops convection cells that further the rifting and deepen the basin allowing water in. The mantle material exposed by the rifting is made of much denser (or mafic) material than continental crust (or felsic) and sinks, cools and hardens/crystallizes forming oceanic crust. A new ocean basin is created.
Step 3 The two new continents continue to drift apart; the rift becomes a young spreading ridge, and the new ocean crust sinks further into the mantle as it cools and becomes denser. Sediment is now collecting on the new ocean floors.
Step 4 The Mid Ocean Ridge (MOR) continues to create new ocean crust and the new ocean deepens as the oceanic crust matures and continues to sink into the mantle. The mature oceanic crust is much heavier than the bordering continental crust, and cracks can develop causing the oceanic crust to flex downwards forming a young subduction zone. Part of the oceanic crust is dragged deep into trench and the water-laden oceanic crust melts due to the higher temperatures of the mantle. Volcanic Island arcs are created. The rifted continental crust is now well below the surface of the ocean.
Step 5 Divergence ceases, and convergence begins. The MOR is eventually subducted, or consumed at the ocean basin margin. Associated volcanism and subduction continues, along with collision, narrowing the ocean and causing mountains to form. This is now part of the ocean-closing cycle.
Step 6 As the continents/cratons continue to collide, folding, faulting, and earthquakes occur creating new mountains (think of the Himalayas), while catching up bits of volcanic rock, oceanic crust and sedimentary rock. A new continent is formed.
Step 7 The continent matures and erodes. Rinse and repeat with continents colliding, eventually forming supercontinents, and dispersing again in a much longer and even deeper time.
The Wilson Cycle is somewhat simplified and doesn’t go into all the sorts of tectonic variations of rift zones and diversity of plate tectonics, but it was a landmark starting point and a sign of Wilson’s genius. Later geologists and geophysicists stand on the shoulders of this giant. We’ll dive further into the Wilson Cycle in future posts, and have a look at the rock types created and how geologists piece together the Wilson Cycle in real rocks. It’ll be fun she said :)
#WilsonCycle #JohnTuzoWilson #OceanicCrustFormation #Mantle #Plume #MidOceanRidge #SubductionZone #MountainForming #geology #ScienceMastodon @geology
-
The Wilson Cycle: Intro
“If the continents have moved, then they have drifted like rafts and formed the ocean floors in their wake. It is to this wake that we should look first.”
~ John Tuzo WilsonCanadian geophysicist and geologist, John Tuzo Wilson, posed the question (and the title of his article in 1966) - ‘Did the Atlantic close and then re-open?’ Spoiler alert - yes. That, and his many contributions to plate tectonics, including the concept of hotspots and transform faults, led to the Wilson Cycle (also known as the Supercontinent Cycle) being named after him.
The Wilson Cycle (WC) refers to the process of continent break-up and ocean-opening followed by subduction, collision, ocean-closing, and continent formation (see the diagram below). This can take tens to hundreds of millons of years (very deep time) to complete.
This quick video provides animation of the WC: https://youtu.be/I_q3sAcuzIY
Step 1 of the WC starts with a tectonically stable continent/craton, eroded down and perhaps scarred by earlier collisions. Rifting (or faulting), crustal thinning, and thermal uplift caused by tectonic stretching of the continent allows the upper mantle (plume) to rise up and fill in. This can lead to earthquakes and volcanic flows. Sometime the plume can die out leading to a failed rift, but when rifting continues, things get quite interesting.
Step 2 The fractures are deep and oriented perpendicular to the extensional direction. As the continent breaks apart, the plume develops convection cells that further the rifting and deepen the basin allowing water in. The mantle material exposed by the rifting is made of much denser (or mafic) material than continental crust (or felsic) and sinks, cools and hardens/crystallizes forming oceanic crust. A new ocean basin is created.
Step 3 The two new continents continue to drift apart; the rift becomes a young spreading ridge, and the new ocean crust sinks further into the mantle as it cools and becomes denser. Sediment is now collecting on the new ocean floors.
Step 4 The Mid Ocean Ridge (MOR) continues to create new ocean crust and the new ocean deepens as the oceanic crust matures and continues to sink into the mantle. The mature oceanic crust is much heavier than the bordering continental crust, and cracks can develop causing the oceanic crust to flex downwards forming a young subduction zone. Part of the oceanic crust is dragged deep into trench and the water-laden oceanic crust melts due to the higher temperatures of the mantle. Volcanic Island arcs are created. The rifted continental crust is now well below the surface of the ocean.
Step 5 Divergence ceases, and convergence begins. The MOR is eventually subducted, or consumed at the ocean basin margin. Associated volcanism and subduction continues, along with collision, narrowing the ocean and causing mountains to form. This is now part of the ocean-closing cycle.
Step 6 As the continents/cratons continue to collide, folding, faulting, and earthquakes occur creating new mountains (think of the Himalayas), while catching up bits of volcanic rock, oceanic crust and sedimentary rock. A new continent is formed.
Step 7 The continent matures and erodes. Rinse and repeat with continents colliding, eventually forming supercontinents, and dispersing again in a much longer and even deeper time.
The Wilson Cycle is somewhat simplified and doesn’t go into all the sorts of tectonic variations of rift zones and diversity of plate tectonics, but it was a landmark starting point and a sign of Wilson’s genius. Later geologists and geophysicists stand on the shoulders of this giant. We’ll dive further into the Wilson Cycle in future posts, and have a look at the rock types created and how geologists piece together the Wilson Cycle in real rocks. It’ll be fun she said :)
#WilsonCycle #JohnTuzoWilson #OceanicCrustFormation #Mantle #Plume #MidOceanRidge #SubductionZone #MountainForming #geology #ScienceMastodon @geology