| 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. |
| Genre: | Article |
| ProdID: | 70022809 |
| Citation Author: | Dreger, D. S.; Tkalcic, H.; Johnston, M. |
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| Citation End Page: | 125 |
| Citation Issue: | 5463 |
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| Citation Language: | English |
| Citation Larger Work Title: | Science |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Dilational processes accompanying earthquakes in the Long Valley Caldera; 2000; Article; Journal; Science; Dreger, D. S.; Tkalcic, H.; Johnston, M. |
| Citation Start Page: | 122 |
| Citation Volume: | 288 |
| Citation Year: | 2000 |
| Type: | citation/reference |
| Text: | Dilational processes accompanying earthquakes in the Long Valley Caldera; 2000; Article; Journal; Science; Dreger, D. S.; Tkalcic, H.; Johnston, M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1126/science.288.5463.122 |
| Date Other: | Sat, 1 Jan 2000 00:00 -0600 |
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