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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. There is a summary map from the wech-o-meter showing the first week's progression of tremor color coded by time.
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.
Aug 19, 2010 - The tremor continues to slowly move north with the leading edge in the middle of the Straits. On the spectrograms it appears to be getting weaker but that is probably only because the best stations for seeing it without cultural noise are to the south (HDW and DOSE). It is now weakly but clearly seen on MCW and SNB. The leading edge of it should be crossing into Canada in about two days. Tomorrow we will have completed three full service runs of all 8 AofA arrays. Preliminary checks of the data using a couple of small local earthquakes for waveform comparisons indicate that the Texans are doing well. Today a switch was made in crew. Mario La Rocca from Osservatori Vesuviano left after five days of great work to be replaced by the big boss himself, John Vidale.
Aug 20, 2010 - Watch out Candians, the tremor is now on your door step. Several wech-o-meter locations this evening are just outside Victoria harbor. By tomorrow Dr. "ETS" Dragert will have them under his garage.
Aug 21, 2010 - The main ETS tremor is now located in the middle of the Straits of Juan de Fuca with the leading edge under Victoria. The Canadians must be happy now. There also continues to be a separate persistent patch of tremor near Olympia that seems to be slowly spreading south with its leading edge near Centralia. Do we have a double ETS this time? Time will tell.
At approximately 10 a.m. yesterday (Tuesday, March 23), an ongoing swarm of small earthquakes began in the Three Sisters volcanic center in the central Oregon Cascade Range. This activity poses no immediate threat to the public. As of this morning, the regional seismic network has detected approximately 100 earthquakes ranging in magnitude up to about 1.5. The rate of earthquakes peaked late yesterday and appears to be declining slowly. The earthquakes are occurring in the northeast part of an area centered 5 kilometers (3 miles) west of South Sister volcano in which the ground has been uplifted by as much as 25 cm (about 10 inches) since late 1997. On the basis of multiple lines of evidence, scientists infer that the cause of the uplift is the continuing intrusion of a modest volume of magma (molten rock). The magma appears to be accumulating at a depth of about 7 kilometers (4 miles) below the ground surface and now measures about 40 million cubic meters (about 50 million cubic yards) in volume. Until yesterday, only a few earthquakes have accompanied this process, but scientists have expected that swarms of small earthquakes such as the present one would eventually accompany the uplift. The most likely cause of the earthquakes is small amounts of slippage on faults as the Earth's crust adjusts to the slow ground deformation of the past 7 years. Heat and gases related to the magmatic intrusion have probably caused increases in fluid pressure deep underground, which also helps to trigger minor faulting events
The processes that have been causing the uplift over the past seven years could eventually lead to shallower intrusion of magma or even to a volcanic eruption; however, both are unlikely without significantly more intense precursory activity
Originally posted by westcoast
So here is the latest update for the 20th:
Aug 20, 2010 - Watch out Candians, the tremor is now on your door step. Several wech-o-meter locations this evening are just outside Victoria harbor. By tomorrow Dr. "ETS" Dragert will have them under his garage.
LINK
Here is the latest tremor map, showing the located tremors for the 20th. There are 360 of them, now about 40 miles south of the canadian border (as of yesterday)...almost directly East of my location by about 20-39 miles.
Link to interactive tremor map
Acutal earthquakes continue to rattle around our State today, with two new ones so far, as well as a 3.6 in neighboring Idao. They don't see too many of those in any given year.
TIt is an interactive quake map, showing all the recent quakes that you can click on for info, and then you can overlay whatever seismo stations you want and then go to it. (very cool)
By looking at the above map, you can clearly see that this past week there has been a cluster of small quakes over top of the deep tremors.
Also, I think it is important to note how the volcanos have been doing this week, since my hypothosis is directly linked to them. Here is a run-down:
Mt. Saint helens:
10/08/14 13:00:50 46.20N 122.17W 0.0-0.6 AD
10/08/16 21:15:01 46.19N 122.18W 0.0-0.5 AB
10/08/17 23:25:17 46.19N 122.18W 1.1 2.2 AA
10/08/18 23:05:27 46.19N 122.17W 0.0-0.6 AC
10/08/20 07:22:33 46.19N 122.18W 0.0-0.8 BA
10/08/20 08:53:25 46.20N 122.17W 0.0-0.3 AD
[url=http://www.pnsn.org/INFO_GENERAL/volcanoes.html]LINK
Now I think it is really interesting to note that Helen's is the ONLY one with ANY activity listed for this past week. Hood, which has been very rumbly lately hasn't had any quakes since August 12th...Then Rainier and Baker have been silent since August 4th. I wonder. (uh-oh, a dangerous thing)
Keep in mind that the Deep Tremor started on August 8th. Helen's is the only volcano showing any activity on and just before:
10/08/07 02:15:25 46.19N 122.18W 1.0 1.6 AA
10/08/07 07:28:42 46.20N 122.18W 3.7-0.2 AC
10/08/07 08:37:48 46.20N 122.18W 3.9-0.3 AA
10/08/07 22:37:40 46.19N 122.18W 0.3 1.0 AC
10/08/08 00:35:21 46.19N 122.18W 0.0-0.6 AA
GIven Mt. Saint Helen's location in relation to where the deep tremors started....I think it would stand to reason that if this has anything to do with Magma migration, it WOULD be the one to react the most. Make sense?