Dilational processes accompanying earthquakes in the Long Valley Caldera
Science
By: Douglas S. Dreger, Hrvoje Tkalcic, and M. Johnston
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Abstract
Regional distance seismic moment tensor determinations and broadband waveforms of moment magnitude 4.6 to 4.9 earthquakes from a November 1997 Long Valley Caldera swarm, during an inflation episode, display evidence of anomalous seismic radiation characterized by non-double couple (NDC) moment tensors with significant volumetric components. Observed coseismic dilation suggests that hydrothermal or magmatic processes are directly triggering some of the seismicity in the region. Similarity in the NDC solutions implies a common source process, and the anomalous events may have been triggered by net fault-normal stress reduction due to high-pressure fluid injection or pressurization of fluid-saturated faults due to magmatic heating.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Dilational processes accompanying earthquakes in the Long Valley Caldera |
| Series title | Science |
| DOI | 10.1126/science.288.5463.122 |
| Volume | 288 |
| Issue | 5463 |
| Year Published | 2000 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Science |
| First page | 122 |
| Last page | 125 |
| Google Analytic Metrics | Metrics page |