| Abstract: | In 1989, an unusual earthquake swarm occurred beneath Mammoth Mountain that was probably associated with magmatic intrusion. To improve our understanding of this swarm, we relocated Mammoth Mountain earthquakes using a double difference algorithm. Relocated hypocenters reveal that most earthquakes occurred on two structures, a near-vertical plane at 7-9 km depth that has been interpreted as an intruding dike, and a circular ring-like structure at ???5.5 km depth, above the northern end of the inferred dike. Earthquakes on this newly discovered ring structure form a conical section that dips outward away from the aseismic interior. Fault-plane solutions indicate that in 1989 the seismicity ring was slipping as a ring-normal fault as the center of the mountain rose with respect to the surrounding crust. Seismicity migrated around the ring, away from the underlying dike at a rate of ???0.4 km/month, suggesting that fluid movement triggered seismicity on the ring fault. Copyright 2003 by the American Geophysical Union. |
| Genre: | Article |
| ProdID: | 70025055 |
| Citation Author: | Prejean, S.; Stork, A.; Ellsworth, W.; Hill, D.; Julian, B. |
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| Citation Issue: | 24 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geophysical Research Letters |
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| Citation Search Results Text: | High precision earthquake locations reveal seismogenic structure beneath Mammoth Mountain, California; 2003; Article; Journal; Geophysical Research Letters; Prejean, S.; Stork, A.; Ellsworth, W.; Hill, D.; Julian, B. |
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| Citation Volume: | 30 |
| Citation Year: | 2003 |
| Type: | citation/reference |
| Text: | High precision earthquake locations reveal seismogenic structure beneath Mammoth Mountain, California; 2003; Article; Journal; Geophysical Research Letters; Prejean, S.; Stork, A.; Ellsworth, W.; Hill, D.; Julian, B. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 2003 00:00 -0600 |
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