Newly Published: San Juan Tsunami Inundation Hazard Maps

Tsunami Hazard Maps of the San Juan Islands, WA —Model Results from a Cascadia Subduction Zone Earthquake Scenario This new publication is part of a collaborative effort to show areas at risk of inundation by tsunamis that are generated from large earthquakes. See other reports and maps on our Tsunami Inundation webpage. For more on […]

The Great M7.8 San Francisco Earthquake, April 18, 1906

110 years later, why the San Francisco Earthquake still matters The San Francisco Earthquake of 1906 was one of the most important geologic events of our time. Shaking damage destroyed many buildings, but it was the fires caused by severed gas lines during the earthquake that caused the city to burn for days after the shaking had stopped. […]

Prepare for the 2013 Great Washington Shakeout, October 17 @ 10:17 AM

The annual Great Washington Shakeout will occur on 10-17-2013 at 10:17 AM. During this drill, participants will practice earthquake preparedness by executing the “Drop, Cover, and Hold On” procedure. For additional information, view the YouTube video (below) produced by the Washington State Department of Emergency Management, and register today for the Great Washington Shakeout!

DGER Aids FEMA

On July 18, DGER Chief Hazards Geologist, Tim Walsh, led a field trip for FEMA officials and their international counterparts from Australia and New Zealand. While traversing Elliott Bay on the Seattle-Bainbridge Island ferry, he spoke on the subject of earthquake and tsunami threats to the Seattle area, recounting evidence of Seattle Fault activity and […]

July Geology Image of the Month: Ghost Forest Near the Mouth of the Copalis River, Grays Harbor County

The ghostly tree trunks of once-submerged red cedars pictured in the July Image of the Month have played a key role in helping geologists reconstruct the events of the last Cascadia Subduction Zone (CSZ) magnitude 9 earthquake. As DGER chief hazards geologist, Tim Walsh, recently explained to a National Geographic television crew (see image below), […]

Seattle Times article profiles our Seismic Scenario Catalog, sends tremors through system

Yesterday’s article published in the Seattle Times, profiling the DNR-hosted Seismic Scenarios Catalog, prompted so many hits to our site that many users received intermittent service error notifications. Rest assured, we are working on this issue and expect service to return to normal soon. We first blogged about the Seismic Scenarios Catalog on its public […]

Aberdeen Landslides and Liquefaction Susceptibility Report Published

The Washington State Geologic Survey announces the publication of Report of Investigations 36. Earthquake-induced landslide and liquefaction susceptibility and initiation potential maps for tsunami inundation zones in Aberdeen, Hoquiam, and Cosmopolis, Grays Harbor County, Washington, for a M9+ Cascadia subduction zone event, by S. L. Slaughter, T. J. Walsh, Anton Ypma, K. M. D. Stanton, […]

Sizing up Seismology

Despite the dreary weather, Washington Geologic Survey’s hazards geologists have been hard at work in the field. They are busy collecting seismic survey measurements and continually adding to a data catalog of shear wave velocity profiles throughout Washington State. Shear wave velocity is an important factor in earthquake-resistant design as designated by the International Building […]

Launch of the Seismic Scenarios Catalog

Today Washington State Geological Survey scientists were on hand as John Schelling, earthquake program manager for the Washington Military Department Emergency Management Division (EMD), presented a live webinar release of the Seismic Scenario Catalog, hosted through DNR in a GIS environment. The catalog is a compilation of results from 20 scenario models run using FEMA’s […]