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Weekly Earthquake Reports
 
Seismo-Watch
Earthquake Alert Bulletin No: 97-186

Preliminary data indicates a significant earthquake has occurred:

Regional Location:

Preliminary Magnitude:

Moment Magnitude (Mw):

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

MENDOCINO FAULT, N. CALIFORNIA

4.2 ML

4.3 Mw (UCB)

97/07/16
19:39:30 (12:39 p.m. PDT)
40.34N
125.08W
6.4 km
B
Notations:
An earthquake occurred registering a preliminary magnitude of Mw 4.3 occurred at 12:39 p.m. local time, July 16, off the coast of Cape Mendocino, Northern California. It was centered about 42 miles west of Petrolia along the Mendocino fault. It was followed by a M3.3 aftershock about 16 minutes later. Focal mechanism indicated left-lateral strike-slip movement, typical of motion of the Mendocino fault. There have been no reports if the temblor was felt.
 
Subtract 7 hours to obtain PDT 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)

Sources Include:
U.S. Geological Survey, National Earthquake Information Center, Golden, CO (NEIC)
Harvard Geophysical Observatory, Harvard University, Cambridge, MA (HRV)
International Data Center, Center for Monitoring Research, Arlington, VA (IDC)
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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