Seismic precursors to the Mount St. Helens eruptions in 1981 and 1982
Science
By: S. D. Malone, C. Boyko, and C.S. Weaver
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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.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Seismic precursors to the Mount St. Helens eruptions in 1981 and 1982 |
| Series title | Science |
| DOI | 10.1126/science.221.4618.1376 |
| Volume | 221 |
| Issue | 4618 |
| Year Published | 1983 |
| Language | English |
| Publisher | American Association for the Advancement of Science |
| Description | 3 p. |
| First page | 1376 |
| Last page | 1378 |
| Country | United States |
| State | Washington |
| Other Geospatial | Mount St. Helens |