Recent Earthquakes

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

 Quakes Near Volcanoes

Seismicity in Last 30 Days

Volcano Earthquakes
St. Helens
Rainier
Hood
Newberry
30 Days Ago Now

Volcanoes without recent seismicity

Adams, Baker, Crater Lake, Glacier Peak, Jefferson, Three Sisters

iMUSH active experiment will show on PNSN stations

Posted by S. Malone, 07/20/2014

The iMUSH active experiment will start this Tuesday (Jul 22) night with a number of explosions being set off in boreholes in the general Mount St. Helens area.  The PNSN is making available realtime seismic data from our stations for iMUSH scientists (and anyone) to monitor these shots as they occur. See the iMUSH blog entry for these realtime recordings.

iMUSH experiment is underway

Posted by S. Malone, 06/20/2014

A crew of 15+ scientists in up to 7 vehicles are installing seismic stations in the Mount St. Helens area for a two year experiment.  Checkout the almost daily updates and less frequent blogs for the iMUSH experiment on its WEB PAGE (imush.org).

Doc Hastings Committee Explores Earthquake Early Warning

Posted by B. Steele, 06/12/2014

Congressman Doc Hastings (Washington's 4th District), Chairman of the House Natural Resources Committee, oversaw testimony on the importance of EEW to the Pacific Northwest.

Increased earthquake activity near LA

Posted by S. Malone, 06/03/2014

LA Times interviews seismologists about recent increased earthquake activity near Los Angeles.

Latest Seismo Blog Posts

Is Mount St. Helens seismicity increasing?

July 29, 2014

by Steve Malone

Looking at the "Quakes near volcanoes" plot today shows that 87 earthquakes have been recorded at Mount St. Helens over the past 30 days. This is way above the average for the past many years. Is this significant? Actually, no. Its called a sampling artifact that gives the impression of increased activity. For the details......
Read More >>

Warm weather triggers snow avalanches at St. Helens

May 15, 2014

by Steve Malone

Several days of very warm weather has resulted in a couple of large snow avalanches at Mount St Helens but apparently no unusually large ones at other volcanoes. The seismic network at Mount St. Helens is particularly good at picking up the shaking due to large snow avalanches. Two such events on the afternoon of May 14 got our attention. For copies of seismograms and photos......
Read More >>

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.