Seismic Readings Show 2 Landslides at Oso - NBC Right Now/KNDO/KNDU Tri-Cities, Yakima, WA |

Seismic Readings Show 2 Landslides at Oso

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Seismometers showed no earthquake triggered Saturday's landslide at Oso, but seismic signals show there were two major slides during the event, about four minutes apart. Seismometers showed no earthquake triggered Saturday's landslide at Oso, but seismic signals show there were two major slides during the event, about four minutes apart.

SEATTLE, WA - Seismometers showed no earthquake triggered Saturday's landslide at Oso, but seismic signals show there were two major slides during the event, about four minutes apart.

Information about the landslide readings was posted Wednesday on the Pacific Northwest Seismic Network blog by Kate Allstadt, a researcher at the University of Washington.  She writes the landslide was detected on 17 seismic stations up to 170 miles away; the closest was seven miles away.

The readings show the biggest slide started at 10:37 a.m. and lasted more than two minutes; this is the slide that hit the town of Oso.  There was a second slide at 10:41 a.m which may have been slumping onto the debris.  

The two major slides were followed by more than a dozen smaller slides for more than an hour.

Snohomish County Emergency Management says a 1.1 magnitude earthquake struck the area on March 10th, centered 100 yards behind the landslide.

 

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