Loading ...May 13, 2008 - Herb Draggert from PGC reports significant displacements are taking place at north-western Washington sites. The Mount Olympus site is moving nearly 5mm westward which is significant. The “footprint” of the displacement also seems to be expanding. However, he still doesn’t see much movement north of the Juan de Fuca Straights. Usually by this time there would be hints of motion up north. Time will tell.
Tim Melbourne of CWU (Central Washington University) agrees that motions have started in Washington and that his long baseline tilt meter records show tilts that are significant compared to the past three months.
Slow Earthquakes (ETS) in the Pacific Northwest
Tilt Data Monitoring of ETS: UPDATED 05/12/08
Below are the preliminary Baytap-G tilt 1-hour solutions for select segments of the Cascadia Tiltmeter Array. Temporal solution space spans 60 days proceeding time of last update. Data trace “down” means south/west down. *Note: these data are NOT detrended.
Shelton Data
Shelton East-Center Baytap-G Solution
Shelton North-South Baytap-G Solution
Sequim Data
Sequim East-West Baytap-G Solution
Sequim North-South Baytap-G Solution
Vernon Data
Mt. Vernon East-West Baytap-G Solution
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Glad to see that this event has been finally confirmed by the USGS & PNSN as well as Canadian Geological Branches that are also monitoring this very crucial event in stress relief of the Cascadia Subduction Zone. Without the relief of this boundary, a Mega-Thrust quake in the Pacific Northwest would almost certainly be eminent.
I’ll continue to disclose any additional information I find on this ETS event, here at OddAmerica.