https://www.europesays.com/ie/709996/ A Strange Heat “Anomaly” Deep Inside Mars Has Scientists Searching for Answers #CerberusFossae #Éire #ElysiumPlanitia #IE #insight #Ireland #MantleConvection #Mars #MarsGeology #MarsInterior #MarsMantle #marsquakes #MartianCrustalDichotomy #nasa #PlanetaryGeology #PlanetaryScience #Science #TidalTomography
#mantleconvection — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #mantleconvection, aggregated by home.social.
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A Strange Heat “Anomaly” Deep Inside Mars Has Scientists Searching for Answers
Artistic rendering of Mars interior. Credit: NASA/Theophilus Britt Griswold Contrary to Earth, present-day Mars has little to no…
#NewsBeep #News #Science #CA #Canada #CerberusFossae #ElysiumPlanitia #insight #mantleconvection #mars #Marsgeology #Marsinterior #Marsmantle #marsquakes #Martiancrustaldichotomy #NASA #planetarygeology #planetaryscience #tidaltomography
https://www.newsbeep.com/ca/912787/ -
https://www.europesays.com/ie/639592/ Scientists discover remnants of Theia, the planet that collided with Earth 4.5 billion years ago #Caltech #CoreMantleBoundary #EarthInterior #EarthMantle #Éire #geophysics #GiantImpactHypothesis #IE #Ireland #LargeLowVelocityProvinces #LLVPs #LunarOrigin #MantleConvection #MoonFormation #NewDiscoveries #PlanetaryFormation #PlanetaryScience #QianYuan #Research #Science #SeismicWaves #Space #SpaceNews #Theia
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Scientists discover remnants of Theia, the planet that collided with Earth 4.5 billion years ago
Two continent-…
#NewsBeep #News #US #USA #UnitedStates #UnitedStatesOfAmerica #Science #caltech #core-mantleboundary #Earthinterior #Earthmantle #Geophysics #giantimpacthypothesis #largelow-velocityprovinces #LLVPs #lunarorigin #mantleconvection #moonformation #NewDiscoveries #planetaryformation #PlanetaryScience #QianYuan #Research #seismicwaves #SpaceNews #Theia
https://www.newsbeep.com/us/815051/ -
Convection Inside the Mantle
Most of what we know about Earth’s interior comes from observing how seismic waves–mostly from earthquakes–bounce around. As our observations have gotten better–more seisometers, better imaging techniques–scientists have identified two large anomalies sitting near the bottom of the mantle. Known as large low-velocity provinces, or LLVPs, these zones take up continent-sized areas beneath parts of Africa and the Pacific.
Seismic waves show lower speeds in large, continent-sized zones that sit beneath Africa and the Pacific. These large low-velocity provinces (LLVPs) are outlined in red.The LLVPs are hot, which would normally make them buoyant, but their stationary nature suggests they are made up of extremely dense material. Narrow plumes of hot material make their way up from the LLVPs to form volcanic hotspots like those that made the Hawaiian and Galapagos Islands. Balancing that upward convection is the downward convection of former tectonic material carried into the mantle at subduction zones.
What the LLVPs are made of remains an active research question. One suggestion is that they contain remnants of Theia, the planet thought to have impacted the proto-Earth to form our Moon. (Image credits: E. Garnero and C. Richardson; see also Physics Today)
Illustration showing convection in the Earth’s inner mantle. Former tectonic material subducts downward in dark blue zones. The large low-velocity provinces (LLVPs) are shown in orange. Hot-spot volcanic activity is seen at the surface (black triangles) above narrow plumes that lift material from the LLVPs toward the surface. #buoyancy #convection #fluidDynamics #geophysics #mantleConvection #physics #science #seismicWaves -
Geophysicists solve the mystery of a 75-year-old ‘gravity hole’ in the Indian Ocean
South of India, the ocean surface slumps into one of Earth’s strangest depressions, a gravity hole so deep…
#NewsBeep #News #US #USA #UnitedStates #UnitedStatesOfAmerica #Science #Africansuperplume #deepEarth #Earthmantle #geoidanomaly #Geophysics #gravityanomaly #GreenGoodNews #IndianOcean #IndianOceanGeoidLow #mantleconvection #NewDiscoveries #Research #TectonicPlates
https://www.newsbeep.com/us/657867/ -
Scientists reveal why gravity is weaker beneath Antarctica than elsewhere on Earth
Gravity feels steady. You drop a set of keys, and they fall the same way every time. That…
#NewsBeep #News #Science #Antarctica #CA #Canada #Earthinterior #earthscience #Earthquakes #geoid #gravity #mantleconvection #research #RossSea #ScientificReports #SeaLevel #truepolarwander
https://www.newsbeep.com/ca/481505/ -
A New Mantle Viscosity Shift
The rough picture of Earth’s interior — a crust, mantle, and core — is well-known, but the details of its inner structure are more difficult to pin down. A recent study analyzed seismic wave data with a machine learning algorithm to identify regions of the mantle where waves slowed down. These shifts in seismic wave speed occur in areas where the mantle’s viscosity changes; a higher viscosity makes waves travel slower.
The team found seismic wave speed shifts at depths of 400 and 650 kilometers, corresponding to known viscosity changes. But they found shifts at 1050 and 1500 kilometers, as well — the first time anyone has shown a global viscosity shift at those depths. Their analysis suggests a higher viscosity in this mid-mantle transition zone, which could affect how tectonic plates, which rely on these slow mantle flows, move. (Image credit: NASA; research credit: K. O’Farrell and Y. Wang; via Eos)
#fluidDynamics #geophysics #mantleConvection #physics #planetaryScience #science #viscosity
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On January 14, 1890, British geologist Arthur Holmes was born. Holmes pioneered the use of radiometric dating of minerals and was the first earth scientist to grasp the mechanical and thermal implications of mantle convection, which led eventually to the acceptance of plate tectonics.
http://scihi.org/arthur-holmes-age-earth/
#geology #physics #platetectonics #mantleconvection #historyofscience #otd