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USGS/Cascades Volcano Observatory, Vancouver, Washington

Mount Hood, Oregon
Seismic Activity, January 1999

A Swarm of earthquakes began at Mount Hood on January 11, 1999. A current list of earthquakes in the swarm is available. In general the earthquakes occurred about 4 miles (7 kilometers) south-southeast of Mount Hood near the Mount Hood Meadows ski area. Several magnitude 3 earthquakes have occurred in the swarm. The largest earthquake in this area in the last 30 years was a magnitude 4 earthquake on December 13, 1974. The approximate location of earthquakes in the January, 1999 swarm is 45.3195N 121.6538W.

Click button for USGS Information Statement, January 14, 1999 January 14, 1999 Information Statement

Plot, Mount Hood Seismicity, 1998, click to enlarge [Graphic,15K,InlineGIF]
Mount Hood Seismicity, January 1998 - January 1999
-- Modified from: University of Washington Geophysics Program

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01/23/01, Lyn Topinka