Mastodawn

The Cascadia Subduction Zone Isn’t Shutting Down – But It’s More Complicated Than We Thought
--
https://theconversation.com/the-cascadia-subduction-zone-isnt-shutting-down-but-its-more-complicated-than-we-thought-279730 <-- shared technical article
--
https://doi.org/10.1126/sciadv.ady8347 <-- shared paper
--
#SciComm #ScienceCommunication #Earthquakes #engineeringgeology #geology #risk #hazard #fault #faulting #Vancouver #VancouverIsland #BritishColumbia #Seattle #OlympicPeninsula #PugetSound #WashingtonState #PNW #PacificNorthwest #NorthAmerica #plateboundary #subduction #platetectonics #spatialanalysis #spatiotemporal #seismicity #seismic #geophysics #offshore #remotesensing #Cascadia #CascadiaSubductionZone #mechanics #lithosphere##

💧🌏 Greg Cocks Apr 14

Subduction Retrieval [XKCD]
--
https://xkcd.com/3218/
--
“PSA: Please stay out of the Pacific Ocean today. Someone lost their wedding ring in a subduction zone and USGS is pulling the plate back up to retrieve it…
Aww, the oceanic crust and the continental crust are getting married!...”
#PSA #geology #platetectonics #subduction #margins #XKCD #fedservice #publicservice #RingOfFire #weddingring #humor #humour #PacificOcean
#USGS #XKCD

CBC Top Stories Mar 1

The ‘Big One’ just got more complicated
Scientists have discovered a massive tear in the tectonic plate off the coast of Vancouver Island. This "rip" suggests that the northern end of the Cascadia Subduction Zone is actually starting to shut down. The CBC’s Johanna Wagstaffe investigates what this discovery might mean for the "Big One" off the coast of Vancouver Island.
#discovery #tectonic #cascadia #subduction #VancouverIsland
https://www.cbc.ca/player/play/9.7107713?cmp=rss

💧🌏 Greg Cocks Feb 19

Timing And Style Of Tectonic Assembly And Exhumation Of The Mchugh Complex Within The Chugach-Kodiak Accretionary Wedge, Alaska
--
https://doi.org/10.1029/2025TC009004 <-- shared paper
--
https://discoveryalert.com.au/chugach-prince-william-terrain-geology-alaska-2025 <-- shared technical article
--
[this paper is WAY over my head in terms of the nuance of structural geology, but still fascinating; further, I have to say: these are TRULY gorgeous, well-designed & presented, and useful geologic maps, cross-sections, annotated photographs and other visualisations (I am jealous of that level of skill, in the BEST of ways!)]
#geology #structuralgeology #fieldwork #geologic #mapping #KenaiPeninsula #McHughComplex #tectonics #underplating #faulting #subduction #erosion #Exhumation #ChugachKodiak #AccretionaryWedge #Alaska #coast #coastal #mineralogy #transects #crosssections #model #modeling #sampling #spectroscopy #accretionary #accretionarymargin #plateboundary #trench #interpretation #peneplanation #forearc

💧🌏 Greg Cocks Jan 28

Slab Tearing Along A Subducted Oceanic Plate Joint Beneath The Alaska Peninsula
--
https://doi.org/10.1038/s41561-025-01749-6 <-- shared paper
--
#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 Nov 15

Mid-Proterozoic Expansion Of Passive Margins And Reduction In Volcanic Outgassing Supported Marine Oxygenation And Eukaryogenesis
--
https://doi.org/10.1016/j.epsl.2025.119683 <-- shared paper
--
https://zenodo.org/records/17353904 <-- supplementary data
--
#proterozoic #platetectonics #tectonics #deepcarboncycle #eukaryogenesis #evolutionoflife #life #evolution #geology #geologichistory #pangea #supercontinent #diversification #volcanic #offgassing #marine #thermodynamics #model #modeling #spatialanalysis #spatiotemporal #nuna #subduction #structuralgeology #CO2 #carbondioxide #climate #eukaryotic #BoringBillion #rodinia #oceanbasins #marinechemistry #outgassing #global #earth

Show thread

Knowledge Zone Nov 15

A #Subduction zone is a geological area where two tectonic plates collide, and one plate sinks or "subducts" beneath the other and is forced into the Earth's mantle.

This process is a result of density differences between the two plates and can trigger powerful #Earthquakes, volcanic eruptions, and #Tsunamis.

https://knowledgezone.co.in/kbits/69159c75eeb3621d436d25db

Bill Minarik Oct 16, 2025

Rare blue yoderite replacing kyanite (-talc + quartz). Only found in two places on Earth (Tanzania and Zimbabwe), yoderite forms at high pressure in hot subduction zones from rocks rich in in Mg and Al, poor in alkalis and Ca, in the presence of water and oxidized ferric iron (±Mn).

Named after Hat Yoder of the Geophysical Lab, CIW.

#ThinSectionThursday #Yoderite #Kyanite #Whiteschist #Subduction #CarnegieInstitutionWashington #Tanzania #Zimbabwe

💧🌏 Greg Cocks Oct 15, 2025

Unravelling The Dance Of Earthquakes - Evidence Of Partial Synchronization Of The Northern San Andreas Fault And Cascadia Megathrust
--
https://doi.org/10.1130/GES02857.1 <-- shared paper
--
“Previous paleoseismic work has suggested a possible stress triggering relationship between the Cascadia subduction zone and the northern San Andreas fault based on similar event timings. Turbidite successions correlated to both systems may support this hypothesis. Historic earthquakes in 1980 and 1992 in the Cascadia subduction zone and the 1906 earthquake on the northern San Andreas fault left turbidite records that are temporally well constrained by bomb-carbon−supported age-depth models..."
#geology #USWest #Seattle #Washington #California #earthquake #engineeringeology #fault #faulting #SanAndreas #Cascadiasubductionzone #linked #Cascadia #research #sediment #sedimentology #Turbidite #paleoseismology #historic #spatial #spatialanalysis #spatiotemporal #model #modeling #stress #subduction #dating #radiocarbon #Holocene