Seismo-Watch

Special Earthquake Report No: 99-010

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Preliminary Magnitude:

Moment Magnitude:

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

CALIFORNIA / MEXICO BORDER REGION

4.1 Ms (NEIC)

n/a Mw ( -- )

99/04/07
06:26:39
32.58N
116.16W
0.0 km
A

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An earthquake registering a preliminary magnitude of Ml 4.1 (SCSN) occurred at 06:26:39 UTC, April 7 (11:26 p.m., PDT), along the southern California/Baja California, Mexico border. The focal point was set at the surface and we do not have a fault plane solution for this event as of yet.
 
The quake was centered about 15 miles southwest of Ocotillo and about 4 miles south of the small border community of Jacumba, in northern Baja California. (See Map) The fault which produced the earthquake is not known at this time.
 
The jolt was felt throughout San Diego County were it rattle windows and caused hanging plants to swing, but was not strong enough to topple items from tables and shelves.
 
It was the fourth M4 quake recorded in the area this year, two in the same location and one closer to Ocotillo. Here is a list of the previous three events:
 
1999  1 13  13 20 56.02  32 43.62-115 55.56  2.57  4.4  
1999  2 19   3  8 32.16  32 35.52-116  9.90  3.38  4.3
1999  3 13  13 31 20.40  32 35.28-116 10.02  6.80  4.3
Times are UTC.
 

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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.
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