From: "David Saum"
hello David. i think you have me confused with another Scott Schwartz. fell free to take me off of this list sin ce i have no clue what any of you are talking about. and you may want to contact your friend Scott Schwartz and get his c orrect email address.
scott schwartz (but you knew that already)
Reply-To: psn-l@.............. To: Subject: VLF Quakes? Date: Mon, 1 Apr 2002 14:03:00 -0500 From 3/28 Seattle Times: http://seattletimes.nwsource.com/html/localnews/134427458_quakeweb28m.html) Thursday, March 28, 2002 - 11:15 a.m. Pacific Feel that? If not, it may be a silent quake By Eric Sorensen Seattle Times science reporter ELLENSBURG - Western Washington is in the midst of an earthquake and a rather sizeable one, but have no fear: it's silent. Researchers at Central Washington University, reporting in tomorrow's issue of the journal Science, say the region has in fact gone through eight "silent earthquakes" since 1992. One in August 1999 released the energy of a magnitude 6.7 temblor, nearly as big as last year's 6.8 Nisqually quake. But because the quakes stretch out over six to eight weeks, their energy is dissipated and barely noticeable. " 'Slow earthquake' is the other term that's been widely used for these," said Meghan Miller, a CWU geologist and lead author of the paper. "The earthquake thing is probably a little bit of a misnomer because there's no real shaking associated with the event. But that's what they're called and I kind of like the 'silent earthquake.' It's poetic." Miller and her colleagues were inspired by work published in Science last year by Herb Dragert, a research scientist with the Geological Survey of Canada in Sidney, B.C., on the 1999 quake. Both papers rely on measurements taken at global-positioning sensors arrayed from Seattle to Neah Bay and on the southern half of Vancouver Island. Ordinarily, the sensors show Western Washington creeping eastward about one-half of an inch a year. This is because the oceanic Juan de Fuca plate is moving east and under the North American Continental plate, forcing the continental plate to compress and move east. But every 14 months or so, the compression in the continental plate eases and rebounds westward. This would be a problem if it rebounded all at once, letting loose a fast, powerful tremor in the upper plate and beneath the major population centers of Vancouver, B.C., Seattle and Portland. But researchers theorize that the movement of silent quakes takes place in a deep, warm and well-lubricated section of the Cascadia fault - where the two plates meet - avoiding the jerky motion that happens when more shallow, cold and stickier portions of the fault give way. The most recent silent quake began on Feb. 7 near Friday Harbor and has been spreading across the region for weeks. The quake is at least magnitude 6, Miller said. Researchers say understanding these quakes gives them a new tool for monitoring the Cascadia fault and how it can cause large earthquakes. While it probably won't help them predict when earthquakes will happen, it should help them prepare for the next large earthquake with better building codes and other safety measures in areas most likely to be affected. Eric Sorensen can be reached at 206-464-8253 or esorensen@................. ------ ...David Saum __________________________________________________________ Public Seismic Network Mailing List (PSN-L) To leave this list email PSN-L-REQUEST@.............. with the body of the message (first line only): unsubscribe See http://www.seismicnet.com/maillist.html for more information.
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