Mastodawn

Slab Tearing Along A Subducted Oceanic Plate Joint Beneath The Alaska Peninsula
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https://doi.org/10.1038/s41561-025-01749-6 <-- shared paper
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#fault #faulting #subduction #slab #oceanic #plate #trench #Alaska #USA #geophysics #seismic #seismology #remotesensing #tomography #model #modeling #seismicity #volcano #vulcanism #Aniakchak #asthenosphere #geology #structuralgeology #mantle

💧🌏 Greg Cocks Aug 30

Implications Of Earthquakes Triggered By Massive Injection Of Produced Water In Saline Aquifers For Large-Scale Geologic Storage Of CO2
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https://doi.org/10.1016/j.ijggc.2025.104447 <-- shared paper
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#largescale #CO2 #storage #inducedseismicity #seismicity #carboncapture #geology #decarbonization #climatechange #globalwarming #subsurface #scCO2 #earthquake #model #modeling #injectiom #oilandgas #reservoir #volume #Oklahoma #Texas #USA #magnitude #pressure #lubrication #sediment #structure

Jascha Polet Apr 23, 2025

Map of historical seismicity near today’s M6.2 #earthquake in western Turkey.
This event may have occurred on the Marmara fault segment of the North Anatolian Fault, thought to present a significant hazard to Istanbul.
#geoscience #geology #seismicity #turkey #istanbul #fault

Giuseppe Michieli Mar 13, 2025

#Naples residents camp #outdoors after overnight #quake https://www.bbc.com/news/articles/cgkm8dxky82o

Many people in and around the Italian city spend the night on the streets and in their cars, fearing aftershocks.

#megavolcanoes #volcanoes #seismicity

Naples residents camp outdoors after overnight quake

Many people in and around the Italian city spend the night on the streets and in their cars, fearing aftershocks.

💧🌏 Greg Cocks Feb 12, 2025

Escalation Of Caldera Unrest Indicated By Increasing Emission Of Isotopically Light Sulfur
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https://doi.org/10.1038/s41561-024-01632-w <-- shared paper
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#GIS #spatial #mapping #geology #structuralgeology #volcano #vulcanism #caldera #numerical #model #modeling #eruption #risk #hazard #seismicity #deformation #gases #engineeringgeology #physicochemical #monitoring #CampiFlegrei #Italy #sulfur #fumaroles #hydrothermal #magma #dataanalysis #global

Jascha Polet Feb 9, 2025

I made a quick #map of historical #seismicity for the region of today’s M7.6 #earthquake near the Cayman Islands. This left lateral strike slip event occurred on a #fault system that produced a few similar events in size & mechanism in the last decade.
(Good to see that USGS NEIC is still online!)
#geoscience #geology #tectonics

💧🌏 Greg Cocks Jan 29, 2025

Large Magma Bodies Found Beneath Dormant Volcanoes, Surprising Scientists
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https://phys.org/news/2025-01-large-magma-bodies-beneath-dormant.html <-- shared technical article
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https://doi.org/10.1038/s41561-024-01630-y <-- shared paper
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#GIS #spatial #mapping #remotesensing #seismology #seismic #teleseismic #magma #volcano #vulcanism #geophysics #geophysical #geology #structuralgeology #crust #hotspot #PNW #PacificNorthwest #MountRainer #MountSaintHelens #eruption #dormant #Cascades #CascadeRange #spatialanalysis #spatiotemporal #MountHood #ThreeSisters #Oregon #Washington #California #NewberryVolcano #CraterLake #MountShasta #LassenPeak #partialmelt #model #modeling #seismicity #earthquake #risk #hazard #active #threat #monitoring #engineeringgeology #EarlyWarningSystem

Large magma bodies found beneath dormant volcanoes, surprising scientists

New Cornell University led-research challenges the long-standing belief that active volcanoes have large magma bodies that are expelled during eruptions and then dissipate over time as the volcanoes become dormant.

Phys.org

💧🌏 Greg Cocks Jan 24, 2025

Deep Beneath California's Sierra Nevada, Earth's Lithosphere May Be Peeling Away
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https://phys.org/news/2025-01-deep-beneath-california-sierra-nevada.html <-- shared technical article
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https://doi.org/10.1029/2024GL111290 <-- shared paper
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#GIS #spatial #mapping #geology #lithosphere #California #SierraNevada #continentalcrust #crust #mantle #foundering #remotesensing #geophysics #geophysical #earthquake #spatialanalysis #spatiotemporal #structuralgeology #earthquake #seismic #seismology #Moho #platetectonics #tectonics #shearzone #faults #faulting #seismicity #model #modeling #3dmodel

Deep beneath California's Sierra Nevada, Earth's lithosphere may be peeling away

The processes that form continental crust from the denser basaltic rocks of the upper mantle may make the lower lithosphere denser than the underlying mantle. One theory holds that the lower lithosphere splits away and sinks into the mantle in a process called foundering. Conclusive evidence of foundering, however, has been hard to come by.

Phys.org

💧🌏 Greg Cocks Nov 17, 2024

The 2023 US 50-State National Seismic Hazard Model - Overview And Implications
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https://www.usgs.gov/programs/earthquake-hazards/science/2023-national-seismic-hazard-model-whats-shaking <-- USGS technical article
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https://doi.org/10.1177/87552930231215428 <-- shared paper
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#GIS #spatial #mapping #earthquake #seismichazard #risk #hazard #shakemap #cost #economics #geology #engineeringgeology #hazardmodel #model #modeling #seismicity #faultruptures #groundmotions #probabilistic #probability #geostatistics #engineering #planning #management #mitigation #NSHM #forecast #infrastructure #publicsafety #hazardassessment #fault #faulting #structuralgeology #intensity #mercalli #buildingcode #design #publicpolicy #shakemap #engineeringrisk #future
@USGS @FEMA

The 2023 National Seismic Hazard Model – What's Shaking? | U.S. Geological Survey

No one can predict earthquakes. But existing faults and past earthquakes give us information about future earthquakes, and geology tells us how the ground shakes during an earthquake.

WeAreSeismica Oct 2, 2024

Do large surface creep events link to deeper earthquakes?

Huang et al.'s research on the Calaveras Fault suggests that structural controls are more important than surface creep transients in driving seismicity.

#Calaveras #fault #seismicity #Seismology #EarthquakeScience #peerreviewed #DiamondOpenAccess #Earthquake #OpenAccess #OpenScience

Microseismicity at the Time of a Large Creep Event on the Calaveras Fault is Unresponsive to Stress Changes

The potential relationship between surface creep and deeper geological processes is unclear, even on one of the world’s best-studied faults. From June to August 2021, a large creep event with surface slip of more than 16 mm was recorded on the Calaveras fault in California, part of the San Andreas fault system. This event initially appeared to be accompanied by along-fault migration of seismicity, suggesting it penetrated to depth. Other studies have suggested that surface creep events are likely a shallow feature, unrelated to deep seismicity. To provide more detail on the relationship between earthquakes, surface creep, and potential aseismic slip at seismogenic depth, we tripled the number of earthquakes in the Northern California Earthquake Catalog in the region of the creep event for all of 2021. This was accomplished by implementing earthquake detection techniques based on both template matching (EQCorrscan) and AI-based automatic earthquake phase picking (PhaseNet). After manual inspection, the detected earthquakes were first located using Hypoinverse and subsequently relocated via GrowClust. Our enhanced catalog indicates that the spatiotemporal pattern of earthquakes here is not strongly influenced by the creep event and is better explained by structural heterogeneity than transient stress changes, indicating a decoupling of seismicity rate and surficial creep on this major fault.

Seismica