Sunday, September 18, 2005

I Felt the Earth Move Under My Feet

Natural Resources Canada


EARTHQUAKE REPORT
NATURAL RESOURCES CANADA
GEOLOGICAL SURVEY OF CANADA
SIDNEY, B.C. V8L 4B2
Voice:(250) 363-6500
Fax: (250) 363-6565
DATE: Tuesday September 13, 2005
TIME: 9 AM PDT
PRELIMINARY MAGNITUDE: ---
LOCATION: Southern Vancouver Island
DEPTH: --
ADDITIONAL INFORMATION:
GSC Scientists Monitor "Tremor and Slip" Beneath Vancouver Island
An important scientific event is currently underway on the west coast of Canada.
The event is the predicted "tremor and slip event" which is related to the movement of the Juan de Fuca and North America tectonic plates along the Cascadia margin of southern British Columbia. The slip event (monitored by Global Positioning Satellite data) and the associated tremors that we are currently experiencing, are directly related to megathrust (Sumatra-like) earthquake potential. Neither the tremor nor the slip can be felt.
The forecast Episodic Tremor and Slip event has now reached southern Vancouver Island. Tremor activity started at 01:00 on September 03 on the Olympic Peninsula of Washington State and has migrated north to the greater Victoria/southernmost Vancouver Island area. Using GPS observation, Natural Resources Canada scientists have confirmed that Victoria has moved 3mm to the west in the 2 days since the slip event began. Episodic tremor and slip occurs roughly every 14th months, and lasts from 6 to 15 days.
By better understanding these events, we will be able to better predict the effects (and perhaps timing) of future magnitude 9 earthquakes along the west coast.
For an update on the current situation, please check our headlines at: http://www.pgc.nrcan.gc.ca/seismo/table.htm
For a detailed description of "tremor and slip" (recently published in both "Science" and "Nature"), please check:
Prepared by: John Cassidy and Herb Dragert
For further information on recent earthquakes, visit our web site at http://www.pgc.nrcan.gc.ca/seismo/table.htm

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