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Earthquake? If you say so

A magnitude 3.3 earthquake with an epicenter about five miles northwest of Sherwood was reported Sunday night by the U.S. Geological Survey.

The minor quake took place around 8:30 p.m. and was felt by metro residents as far away as Beaverton and West Linn. Damage or injuries were not immediately reported.

USGS measurements indicate the earthquake was centered around six miles southwest of Aloha and seven miles south by southwest of both Tigard and Tualatin. This places the epicenter near the Tualatin River along Southwest Scholls-Sherwood Road and Highway 210.

A magnitude 1.6 earthquake was reported 10 minutes earlier, according to the Pacific Northwest Seismic Network.

Though the quakes were centered in the Sherwood area, some West Linn residents reported feeling the effects.

“[I] knew exactly what it was, because we used to live in San Francisco,” West Linn resident Al Holzer said via Facebook.

Other West Linn residents, though, said they felt nothing. Among them was Shannon Phillips Johnson, who lives in the Willamette neighborhood.

“Neither of our dogs or the cat reacted, either,” she wrote.

In Wilsonville, those residents that responded to queries on social media said they had not felt the quake.

“Having lived through the ‘big one’ in SF 1989 it takes more than a 3.3 to get my attention,” Wilsonville resident David Matz tweeted.

Both Wilsonville Police and the Public Works Department said Monday they had not received any reports of damage.

The Sherwood quake was listed by the USGS as having a depth of around 11.7 miles — fairly shallow in geological terms. The quake location also places it right in the middle of the Gales Creek Fault Zone, which stretches from the Coast Range west of Cannon Beach southwest to the area around Sherwood and Wilsonville in the Willamette Valley. Despite that, scientists now have said that the quake seems to have been caused by a previously unknown fault line.

— Additional reporting by Patrick Malee, West Linn Tidings.




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