Winter 2008 ETS

Deep Tremor in Cascadia Zone - Special Seismic and Geodetic studies
Jan. 2008 - June. 2008

Main Tremor Index   |     Interactive Tremor Map   |     Realtime Tremor Map   |     ETS diagnostic Spectrograms   |     Compare Maps   |    
ETS diagnostic Webicorders   |     PGC TAMS/SSA   |     Summary Spectrograms   |     Seismic Envelope Plots     |     Tremor Hours Summary     |    
Cascadia Arrays For EarthScope (CAFE) -

Deep Tremor News: Jan. 2008 - ....         (Winter - Spring, 2008)

This page will have frequent updates from observations and studies of Cascadia deep tremor during the Winter and Spring of 2008 associated with the CAFE experiment including imaging the structure of the Cascadia subduction zone and a study of deep tremor associated with Episodic Tremor and Slip (ETS).
News will be posted on this page (latest at the top) and references to figures from time to time.

Map of CAFE stations in operation during most of the CAFE experiment.

NEWS (latest at the top)


The University of Washington seismic group began studying deep tremor associated with Episodic Tremor and Slip (ETS) events in 2003 using both the regional PNSN and small aperture arrays. With NSF funding we installed Cascadia Arrays for Earthscope (CAFE) for both structural and tremor studies. The CAFE experiment is still installed as of winter, 2008; however the transportable array stations (TA) of earthscope are starting to be pulled out of western Oregon and many will be pulled out of western Washington in February ....... just before the next ETS. Too bad. Some of the more critical stations are being left longer as well as some stations that the PNSN is taking over by purchasing the equipment from IRIS using funds supplied by the Murdock Chairtable Foundation.

Using stations from the PNSN and the TA we use a semi-automated processing system to track the general occurence of where and when deep tremor takes place.

As in the past we plan to collaborate closely with the seismologists and geodesists of the Pacific Geoscience Centre (Natural Resources Canada) and Central Washington University to follow the development of the next ETS.

Previous Studies of ETS by UW scientists

Other information about ETS


Financial Support