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.
| 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 |
| Larger Work Title | Science |
| First page | 1376 |
| Last page | 1378 |
| Google Analytic Metrics | Metrics page |