Frequency-magnitude statistics and spatial correlation dimensions of earthquakes at Long Valley caldera, California
Geophysical Journal International
By: D.J. Barton, G. R. Foulger, J. R. Henderson, and B. R. Julian
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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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Frequency-magnitude statistics and spatial correlation dimensions of earthquakes at Long Valley caldera, California |
| Series title | Geophysical Journal International |
| DOI | 10.1046/j.1365-246X.1999.00898.x |
| Volume | 138 |
| Issue | 2 |
| Year Published | 1999 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geophysical Journal International |
| First page | 563 |
| Last page | 570 |
| Google Analytic Metrics | Metrics page |