Seismo-Watch

Special Earthquake Report No: 99-007

Regional Location:

Preliminary Magnitude:

Moment Magnitude:

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

Central California

4.1 Ml (NCSN)

4.1 Mw (UCBSL)

99/03/23
18:36:40
36.68N
121.30W
6.3 km
A

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Notations:
An earthquake registering a preliminary magnitude of Ml 4.1 (NCSN) Mw 4.1 (U.C. Berkeley) occurred at 18:36:40 UTC (10:36 a.m. PST), March 23, in the Central California. The quake was centered along the San Andreas fault about 13 miles south of Hollister and 13 miles northwest of the Pinnacles, close to the junction of Highway 25 and Airport Road. (See Map)
 
The focal point was placed at 6.3 km beneath the surface and the fault plane solution suggested predominantly strike-slip motion along a northwest trending fault plane. There have been a dozen aftershocks within the first two hours of the temblor, the largest of which registered M3.4.
 
The epicenter was location 9 miles southeast of this past summer's San Juan Bautista M5.1 earthquake which occurred on August 12.
 
Preliminary reports indicate the quake was felt to the north in Santa Clara Valley near Morgan Hill and as far west as Monterey where one resident said it felt and sounded like a passing truck. It was probably not strong enough to topple items from tables or shelves.
 

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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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