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Silent Rumbles Under Our Feet: Slow Slip Events in Cascadia

An overview of slow slip (and tremor) in all of Cascadia - more study needed.

St Helens 40th Anniversary Program

Tune in May 18, 2020 at 6:30 pm PDT (or afterward) to see the PNSN anniversary presentations on: https://www.youtube.com/user/pnsnseisinfo

Getting ready for the next Great Cascadia Subduction Zone Earthquake

Three hundred and twenty years ago, thousands of coastal residents settled in for the night on January 26th 1700, when suddenly the ground began to shake.

Small earthquakes near Fall City

A magnitude 3.4 earthquake near Fall City the evening of Dec. 18 has been followed by a few aftershocks, one of which had a magnitude of 3.0.

SoundersFC Soccer Shake Experiment

The PNSN plans to monitor the MLS Cup Finals in Seattle on Sunday, Nov 10, 2019. Return to this blog for updates as the experiment is installed and gets underway.

The Hills are Alive with the Sound of … Earthquakes?

Help us figure out how Seattle’s unique geography affects earthquake shaking.

Ml=4.6 Monroe Earthquake of July 12, 2019

Additional Info is available for this earthquake, via its event page.

Monroe Mag= 4.6 earthquake of July 12,2019

There is a bit of follow-on information available about this earthquake and it's aftershocks.

Typical Mount Hood Earthquake Swarm

The swarm that started late on July 7 really got hopping on July 9 at about 9am PDT (16:00Z). This swarm looks similar to previous ones near Mount Hood.

An updated tremor monitoring system

A completely redesigned tremor location program and web interface is now available. The hourly tremor plots have been discontinued.

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