Analysis is needed to determine how important these factors actually are for this event. But it is good news!.

Several factors contribute: sparse population at risk, little vulnerable infrastructure, yes - but also possibly the nature of some (not all!) offshore megathrust quakes directing seismic energy away from land, and the position of the Kuril Trench relative to other coastlines.

The M8.8 off Kamchatka appears to be the largest earthquake ever recorded that apparently didn't kill anyone. That's really remarkable, if true.

It's a VERY large earthquake, possibly/probably among the 10 largest ever recorded. A clear subduction megathrust event. And another M>8.5 event with a notable foreshock (the recent M7.4 in same location), like Tohoku 2011. Tsunami warnings/watches should be taken seriously.

We are seeking an External Engagement Lead for the Pacific Northwest Seismic Network! PNSN is the trusted authority on earthquakes and related topics in the PNW. Help us shape earthquake preparedness, advocacy for resilience, and understanding of earthquakes all across Cascadia.

RT @USGSVolcanoes: An earthquake swarm began at Mt. Rainier, WA, at 1:29 am PDT on July 8. Map shows current swarm (orange) with all earthq….

Other work by our group in Ledeczi et al. 2024 (also in @WeAreSeismica) shows that other, more distal splay faults in the outer wedge are instead likely to slip with the megathrust. Taken together, it means the most likely sources of tsunamigenic slip may need reexamination. 4/4

Some regions off Vancouver Island and Grays Harbor WA do show signs of a potentially-active megasplay fault. These locations are more likely to see slip and tsunamigenic displacement from this feature. 3/4.

Careful seismic interpretation led by Madeleine Lucas shows a that the lower slope break is not underlain by an active fault system in most locations - either buried by 100s of m of undeformed sediment, or missing entirely. 2/4.

PNW states use future subduction quake/tsunami scenarios to assess risk to the coast. The most-used scenario today involves a hypothetical massive splay fault extending all the way north to south - which we have shown is mostly non-existent. 1/4

Did an interview with @abbyacone of Q13 TV today on the 45th anniversary of the 1980 MS Helens eruption. We talked about PNSN/USGS monitoring of Cascade volcanoes today: how far we've come . and the real threat of funding cuts. We need a robust @USGS !

Now refined to magnitude 3.2, a little late evening shake for Vashon and surroundings. I didn’t feel it myself, at home in Seattle.

RT @PNSN1: Take a deeper look at the M4.5 Orcas Island earthquake that occurred early Monday morning on the PNSN Blog. It triggered ShakeAl….

We had a strongly felt magnitude 4.5 earthquake at Orcas Island, WA at 5:02 am PST. Not immediately associated with a specific fault, at 16 km (10 miles) depth. Numerous small aftershocks, none felt so far, are ongoing. @PNSN1 is working on more details about the event.

RT @PNSN1: We had an earthquake! M4.5 5:02AM PST in the San Juan Islands area. @USGS_ShakeAlert alerted via Google and @MyShakeApp. This i….

RT @PNSN1: Today marks 24 years since the Nisqually earthquake shook the Puget Sound, causing at least 400 injuries and nearly $4 billion i….

Megathrust anniversary: Exactly 325 years tonight, the Cascadia subduction zone had it's last massive mag 9-class earthquake that launched an enormous Pacific-wide tsunami. We know this how?

RT @PNSN1: PRELIM Earthquake: M3.6, 7.4 km ENE from Fall City, WA at 2025/01/20 13:35 PST ..Did You Feel It?: https….

Casey Moore was my PhD advisor and great friend who we lost way too soon, back in 2020. This brings tears to my eyes.

RT @USGS_ShakeAlert: Good morning Redwood Coast, CA. Did you feel the magnitude 7 earthquake about 40 miles northwest of Ferndale? See: htt….