Deformation near the epicenter of the 1984 Round Valley, California, earthquake
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Abstract
A trilateration network extending from near Mammoth Lakes to Bishop, California, was resurveyed following the 23 November 1984, Round Valley earthquake (ML = 5.8). The network had previously been surveyed in 1982. Deformation apparently associated with the Round Valley earthquake was detected as well as deformation due to the expansion of a magma chamber 8 km beneath the resurgent dome in the Long Valley caldera and right-lateral slip on the uppermost 2 km of the 1983 rupture surface in the south moat of the caldera. The deformation associated with Round Valley earthquake suggests left-lateral slip on the north-northeasterly striking vertical plane defined by the aftershock hypocenters located by A. S. Ryall. The earthquake moment implied by the deformation is about 3.8·1017 N-m, a value equivalent to an earthquake magnitude ML = 5.7 in good agreement with the observed magnitude of 5.8. A 0.053 km3 expansion of the magma chamber and 0.32 m slip on the 1983 rupture surface in the 1982-1985 interval was also required to account for the observed deformation.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Deformation near the epicenter of the 1984 Round Valley, California, earthquake |
| Series title | Bulletin of the Seismological Society of America |
| DOI | 10.1785/BSSA0750051339 |
| Volume | 75 |
| Issue | 5 |
| Year Published | 1985 |
| Language | English |
| Publisher | Seismological Society of America |
| Description | 9 p. |
| First page | 1339 |
| Last page | 1347 |
| Country | United States |
| State | California |
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