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Earthquakes near Mount St. Helens, Washington

March 1, 1973

Seismic monitoring around Mount St. Helens, Washington, for 28 days during the summer of 1970 showed that the frequency of local earthquakes was from 3 to 13 per day and very similar to the activity previously observed near Mount Rainier, Washington. The epicenters of the well-recorded earthquakes form a roughly linear pattern trending northeast from the summit area. This is the only obvious trend in the epicenter distribution. Recent geological investigations have not revealed faults or other major geological discontinuities along this trend. This pattern of epicenters seems to be approximately aligned with the remnants of five ancestral St. Helens plug domes that trend southwest from the summit region.

Publication Year 1973
Title Earthquakes near Mount St. Helens, Washington
DOI 10.1130/0016-7606(1973)84<1065:ENMSHW>2.0.CO;2
Authors J. D. Unger, Kay F. Mills
Publication Type Article
Publication Subtype Journal Article
Series Title Geological Society of America Bulletin
Index ID 70241826
Record Source USGS Publications Warehouse