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

#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/

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

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

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

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