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The section runs north-south from Victoria on Vancouver Island to southern Washington state. Scientists call it a transient slip zone because the fault between two plates slips gradually every 14 months or so. This gradual slip takes place over a two-week period and triggers tremors that are so small people don’t notice them.
In this study the slowly slipping section of the fault beneath Washington state was found to be 27 to 42 kilometres deep instead of 25 to 35. Using sound from compressed air sources in the ocean and small nearby earthquakes, Calvert and his colleagues determined how long it took seismic waves to propagate through the Earth. This told them there is a lot of sedimentary rock in the fault beneath Washington state.
So we have a 3.7 quake (moderate size) right where the subduction zone is and at that depth, it's a bit more concerning. Add to it the micro quakes occuring nearby at a more shallow depth, may (and I stress may) indicate the stress and dynamics going on bellow. I am NOT a geologist. I am just an avid quake watcher. I have watched my area for nearly 15 years now so I know what is unusual. ....
MAP 3.7 2011/07/24 12:19:28 47.708 -123.178 42.3 20 km ( 12 mi) WNW of Brinnon, WA
Experts say a future megathrust earthquake, measuring 9.0 on the Richter scale, will occur somewhere off the coasts of B.C., Washington state and California. That is where the Juan de Fuca and North America plates are locked and are known to slip every 500 to 600 years. The last such earthquake was in 1700.
Magnitude 2.0 - duration magnitude (Md)
Time Monday, August 1, 2011 at 4:27:43 PM (PDT)
Monday, August 1, 2011 at 23:27:43 (UTC)
Distance from Sedro-Woolley, WA - 6 km (4 miles) ENE (60 degrees)
Lyman, WA - 7 km (5 miles) W (277 degrees)
Clear Lake, WA - 10 km (6 miles) NE (34 degrees)
Abbotsford, British Columbia, Canada - 60 km (37 miles) S (170 degrees)
Coordinates 48 deg. 32.0 min. N (48.533N), 122 deg. 9.6 min. W (122.160W)
Depth 2.8 km (1.7 miles)
Location Quality Fair
Location Quality Parameters Nst= 28, Nph= 29, Dmin=12 km, Rmss=0.29 sec, Erho=1 km, Erzz=0 km, Gp=68.4 degrees
Event ID# uw08012327
Additional Information map
Topo map centered at earthquake (This link takes you offsite).