Topographic Regime Controls The Response Of Erosion To Large Earthquakes [New Zealand]
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https://doi.org/10.1130/G54785.1 <-- shared paper
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[as an engineering geologist in a past professional life – and being born, raised and going to university for geology here - this was a super interesting study especially]
H/T @Geological Society of America
🏔️ How can the same earthquake reshape neighboring mountain landscapes in very different ways? The answer may lie in the topography.
New research [link above]… examines how mountain landscapes responded to the great A.D. 1717 Alpine Fault earthquake in New Zealand, revealing that factors including slope steepness, hillslope-to-channel connectivity, and sediment transport capacity can strongly influence the depth and style of post-earthquake erosion.
Researchers compared sediment records from Lake Mapourika and Lake Paringa, two nearby catchments with similar climate, vegetation, geology, and tectonic setting. Using carbon and nitrogen isotopes, molecular biomarkers, and geomorphic analyses, they reconstructed where eroded material came from and how those sources changed following the earthquake.
Despite their similarities, the landscapes responded very differently. In the steeper Mapourika catchment, deep erosion and bedrock landsliding already dominated before the earthquake, so the event dramatically increased sediment delivery without fundamentally changing the style of erosion. At Paringa, however, erosion shifted from predominantly shallow surface soils toward deeper material following the earthquake.
The findings show that pre-existing topography helps determine whether a major earthquake primarily strips away shallow soils or mobilizes deeper soil and bedrock - with implications for sediment transport, landscape evolution, and the movement of organic carbon through tectonically active mountain systems…”
#earthquakes #geomorphology #NewZealand #alpinefault #erosion #massmovement #geology #fault #faulting #tectonics #uplift #engineeringgeology #mountain #elevation #slope #steepness #hillslope #water #hydrology #sediment #riverine #fluvial #vegetation #climate #soils #factors #parameters #hydrogeomorphology #landscape #landcover #topography #geomorphometry #dating #research #carboncycle #timescale #spatialanalysis #spatiotemporal #lacustrine #landslide #debrisflow #ecology
#earthquakes — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #earthquakes, aggregated by home.social.
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58 earthquakes hit Iran in a week
TEHRAN – A total of 58 earthquakes have been recorded across the country in a week from September…
#EuropeSays #Headlines #News #Europe #Europa #EU #Tehran #Earthquakes #Iran #theInstituteofGeophysicsoftheUniversityofTehran
https://www.europesays.com/iran/319495/
