Seismo-Watch

Special Earthquake Report No: 99-023

Regional Location:

Preliminary Magnitude:

Moment Magnitude:

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

OXACA, MEXICO

Ms 7.5 (NEIC)

Mw 7.4 (NEIC)

99/09/30
16:31:13
16.1N
96.7W
54 km
A

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An earthquake registering a preliminary magnitude of Ms 7.5 (NEIC), Mw 7.4 (NEIC) was detected 16:31:13 UTC, September 30, in the southern portion of the Oaxaca State, Mexico. The quake was centered about 270 miles southeast of Mexico City and 65 miles south of Oaxaca de Juarez beneath the Sierra Cimaltepec Mountains.
 
The focal depth was fixed at a depth of 54 km beneath the surface and the fault plane solution indicated normal-slip (down and away) along a northwest trending plane. (See fault plane solution)
 
There are preliminary reports of significant damage in the Oaxaca Province. At lease three people have been killed but news about the earthquake has been difficult to get because transportation routes have been disrupted and widespread power failures. The quake was felt throughout southern Mexico and caused buildings to sway in Mexico City.

Update: 1:50 p.m., September 30, 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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