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USGS/Cascades Volcano Observatory, Vancouver, Washington


Cascade Range Current Update

Submitted at 13:45 PST, January 20, 2001:

Volcanoes in the Cascade Range are all at normal levels of background seismicity. These include Mount Baker, Glacier Peak, Mount Rainier, Mount Adams, and Mount St. Helens in Washington State; Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake, in Oregon; and Medicine Lake, Mount Shasta, and Lassen Peak in northern California.

Small earthquake swarm at Mount Hood, January 10-19, 2001: Typically, Mount Hood averages about one to two swarms of small earthquakes each year. The last occured in May 2000. Since January 10, 2001, a swarm of 13 earthquakes (Magnitude range = 0.2 to 2.0) has occurred in an area about 4 to 8 kilometers (2.5 to 5 miles) south-southeast of the summit at a depth of 4 to 7 kilometers (2.5 to 4 miles). This area is frequently a source of earthquake swarms. The current swarm consists of fewer and smaller events than is typical, but it may not yet be over.

USGS Cascades Volcano Observatory, the Pacific Northwest Seismograph Network at the University of Washington, and the USGS Northern California Seismic Network and Volcano Hazards Team in Menlo Park, California, monitor the major volcanoes in the Cascade Range of northern California, Oregon, and Washington.



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01/23/01, Lyn Topinka