When Is Mud Dangerous?
ES1204  Earthquake-Caused Mudslide

When unstable soil experiences shaking, it can flow downhill. In February 2001, the Nisqually earthquake shook the Puget Sound region in Washington. This mudflow occurred on the unstable surface of a preexisting landslide.

  !   Move your cursor over the image to highlight the area that slid.

Alan Chleborad, USGS

Mudslide on surface of preexisting landslide, Puget Sound region, Washington.

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