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

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

Seattle URMs vulnerable to shaking

Posted by S. Malone, 08/10/2015

Earthquake information in Seattle:

The Seattle Times has a good article on City's old brick buildings could see huge damage in big quake.

Northwest Public Radio and NPR Stations KUOW and KPLU covered the visit of Senator Murray and Representative Kilmer to the PNSN labs on Monday and KIRO TV has raw footage of the press conference.

"The Really Big One" Public Forum

Posted by A. Ling, 07/31/2015

A public forum on earthquake hazards and preparedness in the Pacific Northwest will be held at Unviersity of Oreogn on August 6 from 7pm to 9pm. The event will be streamed live on the Internet via the UO Channel and you can follow the discussion on Twitter at ‪#‎TheReallyBigOne‬.

USGS Funding Boost on West Coast Earthquake Early Warning

Posted by A. Ling, 07/30/2015

The USGS announced $5 million in funding that will allow the University of Washington, California Institute of Technology, UC Berkeley, and University of Oregon to help transition the prototype ShakeAlert earthquake early warning system, under development since 2005, into a public-facing tool. The Seattle Times and UW News report the annoucement.

Seismology Rocks!

Posted by A. Ling, 07/28/2015

Wondering what we do at the UW seismology lab? Check out the UW Daily's new article featuring the PNSN.

Latest Seismo Blog Posts

How big was that earthquake?

September 24, 2015

by Steve Malone

Determining an earthquake's size seems to often result in different and inconsistent estimates. The "Magnitude" of an earthquake can be determined by several different methods, all of which should have some relationship to one another and, at least be consistent one earthquake to another. Unfortunately that's often not the case. PNSN seismologists spend lots of time estimating (measuring and calculating) earthquake magnitudes and end up discussing (arguing over) different techniques and complaining (whining) about inconsistencies and criticizing (belittling) certain results. Recently some effort is being made to try and refine (improve) our standard, routine ways of determining magnitude. We are starting to upgrade our published catalog with these "improved" magnitude estimates so you may see these estimates change from what was in the catalog before. Don't worry. The earthquakes have not changed, just our estimate of how big they are. For the gory details of how this is being done......

Summer rockfall time, yet again

August 21, 2015

by Steve Malone

With hot dry weather it is not surprising that the seismic records for volcano stations show lots of signals consistent with rockfall/avalanches and other exotic seismic events. In fact it is a bit of a surprise that we have not seen more and bigger such events this summer........ so far. Recent activity at Mount Rainier has included a debris flow (probably related to a jökulhlaup) and a moderate sized rockfall from high on the southwest side of the volcano. For some of the seismic details.....

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.