Mastodawn

💧🌏 Greg Cocks Sep 28, 2023

Tree Rings Reveal A New Kind Of Earthquake Threat To The Pacific Northwest
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https://phys.org/news/2023-09-tree-reveal-kind-earthquake-threat.html <-- shared technical article
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https://doi.org/10.1126/sciadv.adh4973 <-- shared paper
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[as someone who has dove many, many times in the PNW, I am not sure I want that collection task ~wink~ ]
#GIS #spatial #mapping #PNW #earthquake #fault #faulting #paleoseismology #PacificNorthwest #treering #dating #relativedating #shallowfaults #model #modeling #naturalhazard #engineeringgeology #seismicevent #PugetSound #treeringdating #hazard #riskhazard #hazardmodel #regionalhazard #threat

Tree rings reveal a new kind of earthquake threat to the Pacific Northwest

In February, a 7.8-magnitude earthquake shook the Turkey-Syria border, followed by one nearly as large nine hours later. Shallow faults less than 18 miles beneath the surface buckled and ruptured, causing violent focused quakes that leveled thousands of buildings and killed tens of thousands.

Phys.org

BrownsBay Apr 17, 2023

A couple weeks ago, I was walking along a beach at Camano Island. The beach is below some bluffs of advance outwash sand and capped by till. There's more to that story, maybe later. There were a few cool rocks that had dropped to the beach from the bluffs, probably out of the till. Here's one rock that perfectly illustrates relative age dating and the principle of cross-cutting relationships. Basic geology 101, right? #geology #rocks #agedating #crosscuttingrelationships #relativedating