It looks like northern Japan coastal ports have seen tsunami waves arriving already, but so far just 30-70 cm high. Later-arriving peaks could be higher, but that is good news that the ultimate size will be moderate. I hope so! Damage reports sketchy so far, but also some reason for optimism.

I love this. @pnsn1.bsky.social

Some false reports are circulating that Mt. Rainier is suddenly showing seismic tremor activity — this is not true. The signal being referenced is actually radio interference, most likely due to rime ice buildup on the antenna of one of our seismic stations.

NOAA cut funding for critical parts of the tsunami and earthquake detection system in Alaska, primarily in the Aleutians. I spoke to Wash Post about negative impacts. But, hey, what are the chances of a deadly tsunami being triggered in Alaska? (Gift article, not behind paywall) ⚒️ wapo.st/4qKvavQ

This visualization of Japan’s M6.8 yesterday is phenomenal. Offshore S-net detected it and issued earthquake alert before any land station detection. Numbered circles show JMA intensity (not same as MMI). Offshore is where we need to be in Cascadia as well.

Today's Japan M6.8 is in an interesting spot: the zone of "missing" slip just north of the very large shallow rupture in the 2011 M9.

Quoted supporting our counterparts and friends at the Alaska Earthquake Center. The cost of the U.S. tsunami warning and mitigation effort is really a pittance. None of it has ever been adequately funded in any administration, and now things are worse. ⚒️ www.nbcnews.com/science/tsun...

Geno Suarez hits a Grand Slam to put the Mariners up 6-2 and seal Game 5 of the ALCS! "The City is Shaking!" #SeizeTheMoment

You feel that Seattle?! Check out that Polanco P-Wave! Polanco Game Winning Single, Crawford Scores, MARINERS WIN!! @Mariners are Toronto Bound! @Tmobilepark @FoxSports #SeisTheMoment #SeizeTheMoment

Dubs is ready to #ShakeOut... Are you? We’re just ONE WEEK away from the Great ShakeOut earthquake drill on October 16! Join Dubs in practicing Drop, Cover, and Hold On. Register your participation and explore all the ways you can boost awareness for this event at shakeout.org.

Interesting study! And this animation blending the model with the observed SWOT image is gorgeous.

Tsunami evacuation systems in Kochi City and Kure town, Shikoku Island. The 1946 Nankai Trough earthquake and tsunami swept ashore here, flooding all these areas - only the most recent of many over the past ~1300 years. The vertical evac towers are really impressive.

Yokonami melange, a paleo-megathrust, and so, so much chert, near Kure, Shikoku Island, Japan

We recently spent 2 weeks doing field work in a remote part of Olympic National Park, studying what we think is another part of the 'fossil' subduction plate boundary fault: a paleo-megathrust. The terrain was rugged and challenging, and the rocks were rewarding. Here's a taste. ⚒️

And Steve Malone is still analyzing volcanic earthquakes at PNSN in 2025!

This eruption is an interesting … coincidence?? Seismically triggered eruptions are not really my specialty, but I answered the phone on Sunday morning when @npr.org’s @gbrumfiel.bsky.social called, so here you go: Russian volcano erupts days after monster quake shakes www.npr.org/2025/08/03/n...

Here is @noaa.gov's model of the tsunami propagation from the people at PMEL, initiated with the earthquake location and then calibrated by the DART buoy observations. There is a wealth of great information at their website (link in thread). (1/6) ⚒️ www.youtube.com/watch?v=oOtJ...

Went on CBS Mornings today to talk about the tsunami and how it all unfolded. They had good questions. www.cbsnews.com/video/why-a-...

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. ⚒️

I am glad @evanbush.bsky.social used this quote in this excellent @nbcnews.com story. This is a key message I really wanted to get across in interviews today. Article here: www.nbcnews.com/science/scie...

Wednesday evening, tsunami waves are still sloshing around at Port Angeles, WA ... 18+ hours after they first arrived. Source: @noaa.gov tide gauge website. ⚒️

NEW: A magnitude 8.8 megaquake blasted tsunami waves across the Pacific today. Here's everything you need to know about it, including: -Why it happened -Why it generated a widespread tsunami -Why the timing of this megaquake is a bit weird Me, for NatGeo www.nationalgeographic.com/science/arti...

Another earthquake story from @sciam.bsky.social by the always-excellent @squigglyvolcano.bsky.social explaining why the tsunami from the Russia quake wasn't as huge as the one from the 2011 Japan quake, for example. 🧪

Today's M8.8 (orange circle) and the 1952 M9.0 epicentral locations, separated by only 73 years. I wouldn't have thought that possible! Average recurrence intervals don't tell the full story. ⚒️

This is a VERY large earthquake, possibly/probably among the 10 largest ever recorded. A clear subduction zone megathrust event. And it is another M>8.5 event with a notable foreshock (the recent M7.4 in same location), like Tohoku in 2011.

I'm excited to announce that 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 hazards information all across Cascadia.

The 2025 earthquake swarm is now the largest one ever recorded at Mt. Rainier. It exceeds even the 2009 swarm in cumulative magnitude and event number and rate. >340 quakes located by @pnsn1.bsky.social so far, with 1000s more detected. Still not showing signs of unrest. www.usgs.gov/observatorie...

Here is a good non-technical article explaining what is going on at Mt. Rainier today. Biggest swarm since 2009; not rising to the level of "unrest" and not concerning at this point. But very interesting and a sign that Rainier is absolutely an active volcano! ⚒️ www.seattletimes.com/seattle-news...

On 7/8/25, the USGS & PNSN detected a swarm of earthquakes at Mount Rainier starting at 1:29AM PDT. Currently, there is no indication that the level of activity is cause for concern, alert level & color code for Mount Rainier remain at GREEN/NORMAL. CVO Statement: volcanoes.usgs.gov/hans-public/...

Good news, I guess, but the fact that this is a real story about the government of the United States of America is absolutely bonkers.

Absolutely speechless as this press conference basically ignores that NSF is already working, living, loving this building. www.youtube.com/watch?v=Zdct...

I want to be super clear here: the main subduction fault (the “megathrust”) definitely exists! This article is about a different fault that branches (“splays”) off of it.

The 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. With new seismic reflection data, we have shown that the 'megasplay' is mostly non-existent. 1/4

CNN on the damage being done to natural hazard monitoring by this misguided administration. I'd say that one quote from me feels a little off – I don't expect Cascadia to be the "largest" we've ever seen on the planet – but the gist is on target. www.cnn.com/2025/05/20/c... ⚒️

Here's an interesting fact about Mt. St. Helens: Most of the bulk of the mountain itself was formed in just the last 3000 years – including pretty much all of what was blown away in 1980. The entire volcanic system is only ~275,000 years old. Volcanoes are ephemeral, geologically-speaking. ⚒️

I did this in-studio interview with Q13 tv in Seattle today, mostly about monitoring Cascade volcanoes now, including the critical need for uninterrupted federal funding. www.fox13seattle.com/news/wa-volc...

While today’s seismic stations at Mount St. Helens may look very different from those in 1980, their core purpose remains the same: to record continuous ground shaking that scientists at PNSN can analyze to locate earthquakes and determine their magnitudes.

This week will feature posts on the May 18th Mt St Helens eruption anniversary, highlighting the PNSN's & the University of Washington's role in monitoring the 1980 seismic activity, and its lasting impact on the PNW, seismology, volcanology, and emergency management.

New research on a less-known effect of the next Cascadia quake & tsunami: after it’s over, sea level will be MUCH higher in many coastal sites due to sudden land subsidence that could be up to 1-2 meters. This compounds effects of warming-induced rising seas.⚒️ www.nbcnews.com/science/eart...

🚨New Study Alert!🚨 Our new PNAS study shows how earthquake-driven land subsidence + rising seas = major flood hazards along the Cascadia subduction zone. 🌊🌎 @cascadiaeqs.bsky.social (1/🧵) www.pnas.org/doi/epdf/10....

Today’s mag 6.2 and 5.3 earthquakes on the North Anatolian fault’s Marmara Sea segment are concerning because they are within and adjacent to the locked part closest to Istanbul, with mag 7.4 potential. Read here for expert analysis from GFZ’s Marco Bohnhoff and others. www.gfz.de/en/press/new... ⚒️

Anchor Bolts xkcd.com/3078

Today is the anniversary of the Pacific Northwest's worst modern earthquake, the April 13th, 1949 mag 6.7 near Olympia. 8 people died, many were injured, and millions of $$ (in 1940's money) in damage. It was a "slab event" in the subducted plate at ~50 km depth.

Regional #seismic networks are the backbone of #earthquake safety in the U.S., and funding them is critical. Find out why with @uussquake.bsky.social @caltechseismo.bsky.social @usgs-shakealert.bsky.social University of Memphis CERI and Oklahoma Geological Survey buff.ly/D8Orzut

Bad news in the NSF Grad Fellowship program - only half as many awarded as were last year, which was already down from 2023. Given the current CR flat budget, NSF must be hedging against potential big cuts next fiscal year. Ugh. www.science.org/content/arti...

In Washington, a Sunday morning wake-up for some in the form of a magnitude 3.7 shallow earthquake at 8:15 am this morning in a fairly remote area between hwy 410 and I-90, east of Enumclaw. [http://www.pnsn.org/event/62080827] Did You Feel It?: Report it here zpr.io/FxUDGTpFBuQR ⚒️

Last call! Due to popular request, the Cascadia Subduction Zone Special Issue deadline is extended to the 1st of May 2025. Submit your Research Articles, Reports, or Fast Reports now. Don’t miss out! 📩Submit here: seismica.library.mcgill.ca/announcement... 📷 James Wheeler, pexels.com

I fear this will be a devastating event in Myanmar. Hoping that it is merciful in the loss of life.

Oh no. This is close to a worst case earthquake as one can imagine happening in a densely populated area, near Mandalay. And it hits hard because I worked there in 2018 trenching the Sagaing fault almost exactly where this epicenter is. earthquake.usgs.gov/earthquakes/...