Seismo-Watch

Special Earthquake Report No: 99-025

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EASTERN SIERRA NEAR BISHOP, CALIFORNIA

ML 4.4 (NCSN)

Mw n/a ( -- )

99/11/07
01:53:12
37.36N
118.58W
9.5 km
A

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An earthquake registering a preliminary magnitude of ML 4.4 was detected by the Northern California Seismic Network (NCSN) at 01:53:12 UTC, November 8 (5:53 p.m. PST, November 7), along the eastern side of the Sierra near Bishop. The focal point was placed at a depth of 9.5 km below the surface and the fault plane solution suggests strike-slip motion along a northwest trending plane.
 
The quake was centered about 10 miles west of Bishop in Round Valley, near the Tungsten Hills. There has been as many as ten aftershocks within the first 3 hours of the jolt, the largest of which measured M3.1 at 7:37 p.m. Although there are a series of faults in the area on which the quake may have occurred, they are collective referred to as the Round Valley Fault zone.
 
The quake was widely felt in Owens Valley but there have been no reports of any items toppling from tables or shelves. Some residents of Bishop reported the quake as a roller. There has been no word from residents in Mammoth Lakes as of yet.
 
Round Valley has been the site of significant earthquake activity in the past, most notably a M6.1 on November 23, 1984. That quake was not preceded by any foreshocks but followed by a robust aftershock sequence which consisted of thousands of events, including three in the M5 range. The last quake to register in the M4+ range in Round Valley measured M4.1 and occurred February 7, 1990.

Update: 10:00 p.m., November 7, 1999.

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Subtract 8 hours from Greenwich Mean Time to obtain PST or 4 hours for EDT
Location Quality: A (good), B (fair), C (poor), D (bad)
Magnitude: Ml (local or Richter magnitude), Lg (mblg), Md (duration), Mb (body wave), Ms (surface wave), Mw (moment)

Standard Sources Include:
U.S. Geological Survey, National Earthquake Information Center, Golden, CO (NEIC)
Harvard Geophysical Observatory, Harvard University, Cambridge, MA (HRV)
U.S. Geological Survey, Northern California Seismic Network (NCSN)
University of California, Berkeley, Seismological Laboratory (UCBSL)
Southern California Seismic Network (USGS & Caltech), Pasadena, California (SCSN)
California Institute of Technology, Pasadena, California (Caltech)
various wire reports and/or personal communications

All data are preliminary and subject to change.
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