Minor earthquake rattles Mirrormont early Thursday

August 18, 2011

By Warren Kagarise

NEW — 6:30 a.m. Aug. 18, 2011

Seismologists recorded a magnitude-2.3 earthquake early Thursday in the Mirrormont neighborhood on Tiger Mountain.

University of Washington seismologists said the micro-earthquake occurred at 12:49 a.m., about five miles south of downtown Issaquah.

Seismologists at the Pacific Northwest Seismic Network, based at the University of Washington, said the temblor occurred 3.9 miles beneath the surface.

The seismic activity came a year after seismologists recorded other micro-earthquakes in and near Issaquah.

Such small earthquakes occur often, and do not indicate another, larger quake is imminent.

Seismologists recorded a magnitude 1.6 earthquake about three miles northeast of downtown Issaquah in July 2010. The micro-earthquake followed a magnitude 1.1 micro-earthquake centered about four miles east of the city last June. UW seismologists said another micro-earthquake, magnitude 2.6, occurred at 9:52 p.m. Sept. 3 in Mirrormont.

The tiny temblors reminded residents about the seismic risks present along the Seattle Fault, a shallow zone stretched along Interstate 90 from Puget Sound and east through lakes Washington and Sammamish.

Issaquah is also near the Rattlesnake Mountain and South Whidbey Island fault zones.

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