Recent Earthquakes

Recent natural and manmade seismic activity.  Click figure for details.

 Quakes Near Volcanoes

Seismicity in Last 30 Days

Volcano Earthquakes
St. Helens
30 Days Ago Now

Volcanoes without recent seismicity

Adams, Baker, Jefferson, Crater Lake, Glacier Peak

Deep part of Cascadia fault so slippery sun, moon trigger tremors

Posted by A. Ling, 04/28/2015

The Seattle Times and UW News have a report on University of Washington Earth and Space Sciences professor Heidi Houston’s research on slow-slip quakes in the Pacific Northwest. The study shows that the gravitational pull of the sun and the moon affect the ‪Cascadia Fault‬ a few days after it has started slipping.

ShakeAlert: Earthquake Early Warning Simulations

Posted by A. Ling, 02/12/2015

ShakeAlert, the Pacific Northwest region's Earthquake Early Warning System, has begun testing by selected users. These videos show the example simulations of a M8.0 Cascadia offshore earthquake and the 2001 M6.8 Nisqually earthquake on PNW ShakeAlert User Display.

Earthquake Early Warning Test Planned

Posted by S. Malone, 02/11/2015

The Seattle Times has a report on PNW Earthquake Early Warning's first test.

Earthquake early warning begins testing in Pacific Northwest

Posted by A. Ling, 02/11/2015

UW News: The first early earthquake warning system for the region has begun testing with a small group of users at businesses and public agencies.

Latest Seismo Blog Posts

Why earthquakes disappear

May 31, 2015

by Renate Hartog

Earthquakes have been appearing and disappearing from the U.S.G.S. webpages, this blog explains why.

PNW Earthquake Early Warning prototype goes live

February 18, 2015

by Steve Malone

Earthquake Early Warning (EEW) is now officially working for the Pacific Northwest (Washington and Oregon) in the same way it has in California for the past two years. It even got tested the first night in operations and worked...sort of. A workshop hosted by the PNSN at the University of Washington on Feb 17 introduced the topic and featured software to a group of about forty invited participants. For a few details on the workshop and the system's first live test......

The PNSN reduces risk within the states of Washington and Oregon by

  • monitoring ground motions within the region in order to better understand earthquake and volcano hazards and their impacts on the physical, economic, political, and social environment,
  • providing the most accurate information about earthquakes and volcanoes as rapidly as possible to public officials, the public, and for education, and
  • advocating comprehensive and cost-effective measures for reducing the harmful effects of earthquakes and volcanoes.