I was online this afternoon here in Arcata, and pretty simultaneously heard an explosive sound and felt a force pass beneath my chair, and some shaking. Then another wave of shaking, not a lot but enough to visibly wobble and shake my computer screen.
I headed for the usual US gov site to see what happened but it was shut down--the shutdown.
Other sites were operating though and it's officially now a 4.9 earthquake about thirty miles off the coast between Eureka and Trinidad. It was felt throughout the area, even into southern Humboldt. Some people felt objects and themselves lifted off the ground, saw trees swaying, but so far no damage or injuries reported on the local sites. The HSU seismograph is reproduced above.
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