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Seismic precursors to the Mount St. Helens: Eruptions in 1981 and 1982

Science

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Abstract

Six categories of seismic events are recognized on the seismograms from stations in the vicinity of Mount St. Helens. Two types of high-frequency earthquakes occur near the volcano and under the volcano at depths of more than 4 kilometers. Medium- and low-frequency earthquakes occur at shallow depths (less than 3 kilometers) within the volcano and increase in number and size before eruptions. Temporal changes in the energy release of the low-frequency earthquakes have been used in predicting all the eruptions since October 1980. During and after eruptions, two types of low-frequency emergent surface events occur, including rockfalls and steam or gas bursts from the lava dome.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Seismic precursors to the Mount St. Helens: Eruptions in 1981 and 1982
Series title:
Science
Volume
221
Issue:
4618
Year Published:
1983
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1376
Last page:
1378
Number of Pages:
3