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Thursday, January 04, 2018

Earthquake near Mt. St. Helens January 04 2018 04:54 AM

RSOE EDIS - Earthquake event in USA on January 04 2018 04:54 AM:

A magnitude 3.9 earthquake that hit near Mount St. Helens early Wednesday was followed by a swarm of aftershocks. The quake hit east of Mount St. Helens, 23 miles south-southeast of Morton, just after 12:30 a.m. Wednesday, according to the Pacific Northwest Seismic Network. The PNSN said there have been as many as 19 aftershocks. One of the largest was M2.7. Seismologists said they are confident the earthquake was a tectonic event and not related to magma activity within the volcano itself, but the location and strength of the quake were atypical. "We have had a lot of small, tiny earthquakes in this zone. What we haven't had is an earthquake that size, a 3.9 in that area," said Bill Steele with PNSN. What seismologists primarily expect to see are smaller swarms of quakes on the west side of the mountain. Wednesday's M3.9 quake happened on the east side. People from Mountlake Terrace to Seattle and from Portland to Astoria told KIRO 7 they felt the quake. Viewers in Glenoma, Randle, Morton and other towns along Highway 12 in Lewis County told KIRO 7 they felt significant shaking. No damage was reported. Meanwhile, seismologists have been working on an early warning system that could give an alert as much as a 7 to 10 seconds before shaking begins. "The trains running, the cars, the airplanes landing, there are a lof of things you can do with just a few seconds of warning," said University of Washington seismologist John Vidale. UW seismologists say they log about 17 earthquakes a month on average near Mount St Helens. In the past month, they have tracked more than 80.

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