Pacific Northwest Seismic Network

@pnsn1

The Regional Seismic Network for Washington and Oregon. We operate almost 700 seismic stations and are the authoritative source for information about earthquakes in both states.

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Pacific Northwest Seismic Network@pnsn1· 25d

we fixed the spelling, but thanks for the correction!

Pacific Northwest Seismic Network@pnsn1· 25d

Happy #FieldworkFriday! PNSN field crew recently took a helicopter ride to upgrade equipment at seismic station OSD (Snow Dome) on Mount Olympus in Olympic National Park. Ride along to check out the views!

Pacific Northwest Seismic Network@pnsn1· 26d

PNSN staff & our USGS Seattle colleagues are in Portland for the second time in a month! We came in June for a @cascadiaeqs.bsky.social workshop on earthquake/tsunami scenarios; now we're at the 13th National Conference on Earthquake Engineering connecting earthquake science & engineering practice.

A group of people wearing lanyards gathered outdoors some steps on the UO Portland campus.

A group of people wearing lanyards gathered in the Oregon Convention Center.

Pacific Northwest Seismic Network@pnsn1· Jul 10

Happy #FieldworkFriday! After wrapping up work at station BOW2, our field team spottted two young fawns nearby. Were they curious future field assistants, or just taking a quick break from playing tag with each other?

Solar panal sitting on grass under nice blue sky

Two solar panels sitting on top of grassy hill under cloudy sky

Solar panel facing towards the cloudy sky

Pacific Northwest Seismic Network@pnsn1· Jul 8

7 seismometers, 6 soccer matches, and 21 goals! Here's how the seismograms for every World Cup goal scored at Seattle Stadium stack up. Read the Seattle Times story for more about PNSN's sports seismology (and the real earthquake kind): www.seattletimes.com/seattle-news...

Graphic showing seismogram recordings for all 21 goals scored at Seattle stadium.

Pacific Northwest Seismic Network@pnsn1· Jul 7

And with a final goal from Romelu Lukaku at 90+3, it ends in a 4-1 victory for Belgium. That's it for the #2026WorldCup at Seattle Stadium, but keep an eye out for a roundup of all the goals we captured during the six matches hosted here—and stay tuned for more #SportsSeismology experiments to come!

Pacific Northwest Seismic Network@pnsn1· Jul 7

Oooof: Hans Vanaken scores for Belgium, and now it's 3-1. The Belgian fans at Seattle Stadium aren't shaking the building as hard, but they're getting more opportunities to record their goal reactions at station HWK3.

Pacific Northwest Seismic Network@pnsn1· Jul 7

And then de Ketelaere scored for Belgium again just two minutes later. This is the response from the Belgian fans at station HWK3. #SportsSeismology #WorldCup2026 #FIFAWorldCup

Pacific Northwest Seismic Network@pnsn1· Jul 7

Malik Tillman's free kick equalizes for the USA at 31 minutes! The fans made Seattle Stadium shake and we captured this seismogram of their reaction at station HWK3. #SportsSeismology #WorldCup2026 #FIFAWorldCup

Seismogram showing reaction to USA goal by Malik Tillman

Pacific Northwest Seismic Network@pnsn1· Jul 7

Belgium scores first! Goal by Charles de Ketelaere nine minutes into the match—here's the reaction from the Belgian fans recorded by our station HWK3. #SportsSeismology #WorldCup2026 #FIFAWorldCup

Graphic showing seismogram from Belgium's goal as recorded at station HWK3

Pacific Northwest Seismic Network@pnsn1· Jul 6

Doing a vibe check and making sure everything is ready for the USA vs Belgium match at Seattle Stadium. Vibes are immaculate and everything is ready to rock! Check out all the action on pnsn.org here: buff.ly/BEJqFSa #SportsSeismology #WorldCup2026

Laptop showing seismograms with crowd of fans in Hot Dog Alley and Seattle Stadium in the background

Pacific Northwest Seismic Network@pnsn1· Jul 6

The PNSN team is down here at "Seattle Stadium" to do a live stomp test at seismic station KDK as we prepare for tonight's USA-BEL match! Stop by to join in and get stickers if you're in the area. Find us in Hot Dog Alley (Occidental Ave S) for the next hour or so! #WorldCup2026

A group of people in PNSN gear with laptops and a sign in a parking lot by a brick building.

Pacific Northwest Seismic Network@pnsn1· Jul 6

Curious about how the soccer fanquakes we’ve been recording at Seattle World Cup matches differ from an actual earthquake? Compare these seismograms from the Freeman goal and the M3.8 earthquake near Oak Harbor last week.

Graphic comparing vertical and horizontal seismograms from goal at Seattle stadium and M3.8 earthquake. The amplitude is much higher on the earthquake waves, particularly for horizontal motion.

Pacific Northwest Seismic Network@pnsn1· Jul 2

Wondering about that M3.8 earthquake near Oak Harbor last night? PNSN Director and Washington State Seismologist @haroldtobin.bsky.social explains what we recorded and how PNSN is monitoring the seismic activity.

Pacific Northwest Seismic Network@pnsn1· Jul 2

Our seismometers didn't just record soccer fanquakes yesterday—we also had a M3.8 earthquake near Oak Harbor! Here's how that earthquake was recorded by six PNSN seismic stations nearby and a ShakeMap showing the intensity of the shaking.

Graphic showing epicenter of earthquake and waveforms from six stations: UW TURTL, UW OAKH, UW PRIN, UW BHAM, UW CONW, and UW WRMB

ShakeMap of north Puget Sound with colored shading showing microseismic intensity (mostly corresponding to "weak" and "light")

Pacific Northwest Seismic Network@pnsn1· Jul 2

PRELIM Earthquake: M3.8, 21.5 km NNE from Port Townsend, WA at 2026/07/01 23:35 PDT http://www.pnsn.org/event/714040221 Did You Feel It?: https://zpr.io/Ykx3uAUHQ9X5

Map with a star marker for the magnitude 3.821 earthquake located 21.5 km NNE from Port Townsend, WA

Pacific Northwest Seismic Network@pnsn1· Jul 1

Heartbreak for Senegal as Youri Tielemans converts a penalty at 120+4 to win the match for Belgium! Here's the reaction from the fans in Seattle Stadium as recorded at HWK5. #SportsSeismology #WorldCup2026 #FIFAWorldCup

Graphic showing seismogram for Belgium's third goal

Pacific Northwest Seismic Network@pnsn1· Jul 1

And back-to-back goals—from Romelu Lukaku at the 86th minute and Youri Tielemans at the 89th—equalize for Belgium! The score is tied at Seattle Stadium and the Belgian fans are making the building shake at HWK5 station. #SportsSeismology #WorldCup2026 #FIFAWorldCup

Graphic showing seismogram from Belgium's first goal

Graphic showing seismogram from Belgium's second goal

Pacific Northwest Seismic Network@pnsn1· Jul 1

Senegal scores again! They're up 2-0 against Belgium thanks to a beautiful goal from Ismaïla Sarr off a terrific long pass from Moussa Niakhaté. Here's the crowd response from station HWK3 at Seattle Stadium. #SportsSeismology #WorldCup2026 #FIFAWorldCup

graphic showing seismogram from Senegal's second goal

Pacific Northwest Seismic Network@pnsn1· Jul 1

While we're waiting for the second half, here's what to do if you get a #ShakeAlert earthquake early warning message or feel strong shaking while you're attending a World Cup match in a stadium in earthquake country! Drop, Cover, and Hold On.

Graphic reading: in a large venue: feel shaking or get an alert? 1. Drop if possible, or lean forward, 2. Cover your head, 3. Hold on until shaking stops.

Pacific Northwest Seismic Network@pnsn1· Jul 1

First goal to Senegal! Habib Diarra scores against Belgium in the 25th minute—here's the crowd's reaction recorded at the PNSN HWK3 seismic station in Seattle Stadium. #SportsSeismology #WorldCup2026 #FIFAWorldCup

Alt text showing seismogram from Senegal's goal

Pacific Northwest Seismic Network@pnsn1· Jul 1

Seattle Stadium’s first knockout round match begins in an hour! Join us to watch Belgium vs Senegal at 1:00 PM Pacific, with the live seismogram feed on the PNSN website here: pnsn.org/experiment/2... #SportsSeismology #Worldcup2026 #FIFAWorldCup

Pacific Northwest Seismic Network@pnsn1· Jun 27

Shojae Khalilzadeh's stoppage-time goal for Iran was offside, but the fans in Seattle Stadium still made a seismic statement. The Pride match is a draw at full time! #SportsSeismology #WorldCup2026 #FIFAWorldCup

Pacific Northwest Seismic Network@pnsn1· Jun 27

Ramin Rezaeian equalizes for Iran just nine minutes later! It's 1-1 and the fans at Seattle Stadium are shaking the building. #SportsSeismology #WorldCup2026 #FIFAWorldCup

Graphic with a seismogram showing Iran's goal against Egypt

Pacific Northwest Seismic Network@pnsn1· Jun 27

And Egypt scores the first goal! Mahmoud Saber at 5 minutes in. Here's the recording from our seismometer at HWK3 #SportsSeismology #WorldCup2026 #FIFAWorldCup

A graphic showing the seismogram from Egypt's first goal against Iran

Pacific Northwest Seismic Network@pnsn1· Jun 27

Our rainbow seismograms for the Egypt vs Iran Pride Match at Seattle Stadium are streaming live on the PNSN website here: pnsn.org/experiment/2... #SportsSeismology #WorldCup2026 #FIFAWorldCup

A screenshot of the PNSN event page for the Egypt vs Iran match with rainbow seismograms filling the screen

Pacific Northwest Seismic Network@pnsn1· Jun 26

Happy #FieldworkFriday and Happy Pride from PNSN! Here are a few of our favorite rainbows spotted by our crews and cameras from field work across Washington and Oregon. Tune in tonight for more rainbows as we share seismic data from the #WorldCup2026 Pride match at Seattle Stadium.

A short but vivid rainbow against a darkening sky over a mountain range

a rainbow arcing through the sky above sunlit trees and a brick building

A faint rainbow over the Seattle skyline from the terrace of Lumen Field

A glimmer of a rainbow over a brush-covered hill in golden evening light

Pacific Northwest Seismic Network@pnsn1· Jun 25

PNSN Director Harold Tobin spoke to The New York Times about the seismology behind the devastating earthquakes that struck Venezuela yesterday. Read the article here: www.nytimes.com/2026/06/25/s...

This complexity makes untangling the root cause of Wednesday’s quakes somewhat troublesome. But early indications are that the fault, or faults, that ruptured did so in a strike-slip fashion, meaning two blocks of the crust slipped in a side-to-side manner with respect to each other.

“Strike-slip faults tend to produce strong seismic shaking, especially near to and along the length of the fault that moved,” Dr. Tobin said.

“This is analogous to the East Anatolian Fault that devastated Turkey a few years ago, Haiti in 2010, or the San Andreas Fault,” he added.

Pacific Northwest Seismic Network@pnsn1· Jun 25

Learn and connect with experts at the 13th National Conference on Earthquake Engineering in Portland from July 13-17, hosted by EERI. Full registration and one-day rates available! Check out the program, including many sessions on hazards, vulnerabilities, and risk in Cascadia: 13ncee.eeri.org

Graphic promoting the 13th National Conference on Earthquake Engineering in Portland, OR from July 13-17, noting that full conference and one-day registration rates are available for locals.

Pacific Northwest Seismic Network@pnsn1· Jun 24

Another goal for Bosnia-Herzegovina! Ermin Mahmić brings the score to 3-1 against Qatar, and the Bosnian fans in Seattle Stadium made the ground shake. Here's what we saw on PNSN station HWK4. #WorldCup2026 #FIFAWorldCup #SportsSeismology