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Aug 12, 2010 - After moving slightly to the northwest over the past few days the tremor seems to have moved back to near where it started or even slightly to the south. Uhmmm. What is going on here? On the slip side Evelyn Roeloffs points out that one strain meter, B018 has a clear change from its background starting on Aug 8.
Aug 13, 2010 - The tremor is again moving to the northwest. Comparing the northern edge of it now compared to on Aug 8 it has moved about 35km in 6 days even though the center of each day's locations has moved less than that (~15 km to the west). It remains as strong as ever with some strong bursts showing clearly on stations in the Cascades and San Jaun Islands. At the AofA site the first service run for the two most easterly arrays was completed today but there is no report yet on the nature of the recorded data.
Aug 14, 2010 - Tremor continues as before with a hint it is bifurcating into a cluster southwest of where it started (now its just east of Shelton) and then a more dispersed patch moving into the eastern Olympic Mountains. The northern edge of this patch is very near the location of our BS array
TAug 15, 2010 - The northern edge of the tremor has reached the Array of Arrays, so good data should be being recorded right now. Some of the tremor locations are right under the AofA team's motel in Sequim (but we are feeling nothing). Here is hoping that everything is working well. The Canadians should soon be seeing it coming at them from the south. There is still a pocket of tremor south near Shelton so it is quite spread out now. ext
Originally posted by westcoast
WOW!! Okay, gotta add this too:
Real-time tremor map
[edit on 12-8-2010 by westcoast]
The origin of subduction zone tremor is very unclear, but it may be related to the motion of fluids (perhaps water) in association with the slow slip episodes.
Aug 16, 2010 - The first complete round of servicing of all AofA arrays is now complete and a quick check of a teleseism shows that all data recovered looks good. So far so good.... The tremor is now located directly under the arrays so this should be fun. Also, Tim Melbourne of CWU reports that preliminary analysis of several GPS sites in southern Puget Sound are now seeing the ETS but need to wait on final orbits to nail down the details. And, Kathleen Hodgkinson of UNAVCO confirms that several strain meters are showing well resolved ETS signals and she provides a summary plot of the obvious ones.
Aug 17, 2010 - There seems to have been a bit of a lull in tremor amplitude over much of the last day compared to the previous several days when it was roaring. There is a summary envelop plot of the first 10 days of this ETS that shows the daily fluctuations and recent lull. The northern edge of the tremor is now north of the Olympics coast and there is a southern bunch of tremor clearly separated from the rest, south of Olympia.