| Abstract: | Intense earthquake swarms at Long Valley caldera in late 1997 and early 1998 occurred on two contrasting structures. The first is defined by the intersection of a north-northwesterly array of faults with the southern margin of the resurgent dome, and is a zone of hydrothermal upwelling. Seismic activity there was characterized by high b-values and relatively low values of D, the spatial fractal dimension of hypocentres. The second structure is the pre-existing South Moat fault, which has generated large-magnitude seismic activity in the past. Seismicity on this structure was characterized by low b-values and relatively high D. These observations are consistent with low-magnitude, clustered earthquakes on the first structure, and higher-magnitude, diffuse earthquakes on the second structure. The first structure is probably an immature fault zone, fractured on a small scale and lacking a well-developed fault plane. The second zone represents a mature fault with an extensive, coherent fault plane. |
| Genre: | Article |
| ProdID: | 70021915 |
| Citation Author: | Barton, D. J.; Foulger, G. R.; Henderson, J. R.; Julian, B. R. |
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| Citation End Page: | 570 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geophysical Journal International |
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| Citation Number Of Pages: | 8 |
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| Citation Search Results Text: | Frequency-magnitude statistics and spatial correlation dimensions of earthquakes at Long Valley caldera, California; 1999; Article; Journal; Geophysical Journal International; Barton, D. J.; Foulger, G. R.; Henderson, J. R.; Julian, B. R. |
| Citation Start Page: | 563 |
| Citation Volume: | 138 |
| Citation Year: | 1999 |
| Type: | citation/reference |
| Text: | Frequency-magnitude statistics and spatial correlation dimensions of earthquakes at Long Valley caldera, California; 1999; Article; Journal; Geophysical Journal International; Barton, D. J.; Foulger, G. R.; Henderson, J. R.; Julian, B. R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1046/j.1365-246X.1999.00898.x |
| Date Other: | Fri, 1 Jan 1999 00:00 -0600 |
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