Seismo-Watch

Special Earthquake Report No: 99-004

Preliminary data indicates a significant earthquake has occurred:

Regional Location:

Preliminary Magnitude:

Moment Magnitude:

Greenwich Mean Date:
Greenwich Mean Time:
Latitude:
Longitude:
Focal Depth (km):
Analysis Quality (A-D):

Southern Nevada

4.7 ML (NCSN)

4.8 Mw (UC Berkeley)

99/01/27
10:44:23 (2:44 a.m. PST)
36.81N
115.98W
5 km
A

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An earthquake registering a preliminary magnitude of ML 4.7 (NEIC) occurred at 10:44:23 UTC (2:44 a.m. PST) , January 27, in the south-central Nevada. The quake was centered (map) on the Nevada Test Site about 12 miles north of Mercury in Frenchman Valley and close to the epicenter of a M4.5 that triggered two days earlier.
 
The focal point was fixed at 5.0 km below the surface for quick processing and the University of California, Berkeley, Seismological Laboratory's fault plane solution suggested normal-slip (down and away) motion along a moderately dipping northeast trending fault plane.
 
Preliminary reports indicate the quake was felt at Mercury, Beatty and Indian Springs. But it was not strong enough to topple items from tables or shelves. There was no word from the Department of Energy nor if it effected operations at the Test Site or at the Yucca Mountain facility.
 
Since 1992, there have been 17 earthquakes registering M4.0 or stronger in and around the Nevada Test Site, including one in the M5 range. The largest earthquake measured M5.6 and occurred just outside the southern boundary of the Test Site near Little Skull Mountain. Five aftershocks in the M4 range followed the main shock during the next two years. The most recent event was a M4.4 temblor on January 25, 1999, in the southern portion of the Test Site near Frenchman Flat. Also of recent interest was a M4.1 event just off the northeast boundary of the Nellis Air Force Range in Sand Springs Valley on December 28.
 
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Subtract 8 hours from Greenwich Mean Time to obtain PST or 5 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)
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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