Seismo-Watch

Special Earthquake Report No: 99-012

Regional Location:

Preliminary Magnitude:

Moment Magnitude:

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

DIXIE VALLEY, NEVADA

4.1 ML (NEIC)

n/a Mw ( -- )

99/04/19
12:36:57
39.71N
118.05W
5.0 km
A

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An earthquake registering a preliminary magnitude of ML 4.1 (NEIC) occurred at 12:36:57 UTC (5:37 a.m. PDT), April 19, in west-central Nevada. The focal point fixed at 5.0 km deep for quick processing and we do not have a fault plane solution as of yet. The Seismological Laboratory at the University of Nevada, Reno, has yet to confirm this event.
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The quake was centered about 89 miles east of Reno and about 32 miles north of Highway 50 in Dixie Valley, near the Crazy K Ranch and the Dixie Valley marsh. (See Map)
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Although it is likely to have been felt, there has been no word from the region at this time.
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The quake triggered along the Dixie Valley fault zone, a prominent set of discontinious faults along the east side of the Stillwater Range which ruptured violently during the 1954 Dixie Valley - Fairview Peak M7.3 and M6.8 earthquakes.
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Minor earthquake activity has occurred in this portion of Dixie Valley in the past few weeks. On March 17-18, three M3's were recorded in the same area as today's quake, however, the activity appeared to be waning the previous week. Today's temblor was the largest recorded in Dixie Valley since a M4.2 struck on July 26, 1979 - nearly 20 years ago!
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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)
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.
Copyright ? 1999 Advanced Geologic Exploration, Inc.
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