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

The Difference Between Alarming And Catastrophic - Cascadia Megafault Has One Especially Deadly Section, New Map Reveals
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https://www.livescience.com/planet-earth/geology/the-difference-between-alarming-and-catastrophic-cascadia-megafault-has-1-especially-deadly-section-new-map-reveals <-- shared technical article
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https://news.climate.columbia.edu/2024/06/08/cascadia-subduction-zone-one-of-earths-top-hazards-comes-into-sharper-focus/ <-- shared technical statement
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https://doi.org/10.1126/sciadv.adl3198 <-- shared paper
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#GIS #spatial #mapping #engineeringgeology #risk #hazard #megathrust #fault #faulting #earthquake #PNW #PacificNorthwest #CascadiaSubductionZone #remotesensing #naturalhazard #mitigation #model #modeling #geophysics #seismology #tsunami #displacement #buildingcodes #engineering #construction #warningsystems #plates #platetectonics #spatialanalysis #geometry

Cascadia Subduction Zone, One Of Earth's Top Hazards, Comes Into Sharper Focus
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https://phys.org/news/2024-06-cascadia-subduction-zone-earth-hazards.html <-- shared technical article
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https://doi.org/10.1126/sciadv.adl3198 <-- shared paper
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#GIS #spatial #mapping #PNW #USA #PacificNorthwest #BritishColumbia #Washington #Oregon #NoCal #Seattle #BC #CascadiaSubductionZone #CSZ #megathrust #earthquake #earthquakes #fault #faulting #risk #hazard #geology #structuralgeology #engineeringgeology #remotesensing #survey #geophysics #tsunami #buildingcodes #warningsystems #coast #coastal #tectonics #plates #model #modeling

Really was not expecting to hear the name #Shimanto (AKA #KochiPrefecture) in a lecture about the #Cascadia / #JuanDeFuca fault.

The Shimanto Mountains were mentioned as an analog of our own #OlympicMountains - both are non-volcanic, near a #megathrust #SubductionZone (#NankaiTrough for Japan: major #earthquake every 100-200 years), and contain remnants of paleomegathrust (new fave word) fault lines thanks to historic and ongoing subduction.

As terrifying as it can be, I love #geology so much.

Large-Scale Submarine Landslides In The Barberton Greenstone Belt, Southern Africa—Evidence For Subduction And Great Earthquakes In The Paleoarchean
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https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G51997.1/635654/Large-scale-submarine-landslides-in-the-Barberton <-- shared paper (PDF only)
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#GIS #spatial #mapping #structuralgeology #SouthAfrica #NewZealand #tectonics #subduction #BarbertonGreenstoneBelt #geologicmapping #geology #earthquakes #paleoarchean #stratigraphy #marine #sedimentation #submarinelandslide #hikurangi #megathrust #superposition

Shallow Slow Slip Events Identified Offshore The Osa Peninsula In Southern Costa Rica From GNSS Time Series [geologic faults / tectonics]
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https://doi.org/10.1029/2023GL104771 <-- shared paper
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#GIS #spatial #mapping #GPS #survey #GNSS #costarica #earthquake #faults #faulting #tectonics #shallowslowslipevent #SSE #shallowslowslip #slowslip #geodetic #spatialanalysis #spatiotemporal #osa #OsaPeninsula #station #platetectonics #geology #megathrust #MiddleAmericanTrench #centralamerica #platemotion #model #modeling

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

Work at the #PebbleHill #reservoir began in the fall of 2021 to prepare for #NaturalDisasters in the future.
Metro #Vancouver has been steadily #upgrading its reservoirs since the '90s to ensure it can provide #water to the region following the "#BigOne " — a #megathrust #earthquake expected to hit the #BCcoast someday.
https://www.cbc.ca/amp/1.6783105

I am totally astounded by what I read when I compare these two texts: Maria Graham's description of the coastal #uplift due to the 1822 #Valparaiso #earthquake, versus Charles Darwin's text on very similar phenomena related to the 1835 #Concepción earthquake.

Read carefully, paying attention to the expressions used. It's like if #Darwin borrowed Maria Graham's words, but also her interpretation about the accumulation of earthquakes raising the coast on the long term.
Any comment ?

Both 1822 and 1835 earthquakes happened in Central #Chile on the #subduction #megathrust between Nazca and South America #tectonic_plates. Darwin's description, based on Fitz Roy (Beagle's captain) observations, is considered as seminal.

Thanks @haq for pointing me to the work by Maria Graham.

A magnitude Mw6.9 #earthquake offshore south-central #Sumatra.

Mechanism and location suggest rupture on the shallow part of the #subduction #megathrust close to the trench (on the very shallow dipping fault plane). However, modelled depth of ~19km, if true, seems little too deep given the closeness with the trench (USGS gives same depth and mechanism). This means that we cannot exclude a rupture on the steep fault plane within the oceanic plate.

Map with source time function from Geoscope IPGP
http://geoscope.ipgp.fr/index.php/en/catalog/earthquake-description?seis=us7000iqpn
Larger map with epicenter of this event in red from USGS (both not yet on fediverse it seems)