Tremors Between Slip Events: More Evidence of Great Quake Danger to Seattle

Seattle skyline with Mount Rainier in the background. (Credit: iStockphoto/Natalia Bratslavsky)

From Science Daily:

Science Daily (Dec. 16, 2009) — For most of a decade, scientists have documented unfelt and slow-moving seismic events, called episodic tremor and slip, showing up in regular cycles under the Olympic Peninsula of Washington state and Vancouver Island in British Columbia. They last three weeks on average and release as much energy as a magnitude 6.5 earthquake.

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