Seismo-Watch

Special Earthquake Report No: 00-003

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Greenwich Mean Date:
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OFF THE COAST OF OREGON

Ms 5.5 (NEIC)

Mw 6.1 (Caltech)

00/01/20
09:41:47
43.66N
127.30W
10 km (Fixed)
A

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Seismo-Watch has received information that "an earthquake registering a preliminary magnitude of Ms 5.5, Mw 6.1 was detected at 09:41:47 UTC (1:41 a.m. PST), January 20, 2000, off the coast of Oregon. The focal point was fixed at depth of 10 km for quick processing and the fault plane solution suggested strike-slip motion along a west-northwest trending plane.
 
The quake was centered about 155 miles west of Coos Bay, Oregon, along the eastern segment of the Blanco Fracture Zone. It was centered too far from shore to have been felt.
 
It was the 5th M4+ quake recorded off the coast of Oregon in the past four days. Earthquake activity along off shore seismic zones, including the Mendocino Fault, the Gorda plate and Gorda Ridge and the Blanco Fracture Zone, has increase substantially in the last two months. Since November 22 there have been 13 quakes registering M4.0 or stronger, including two in the M5+ range. This is in contrast only five events measured in the previous five months. This mornings earthquake was the largest since a M6.2 temblor struck near the central Gorda Ridge in 1996 and comes just 12 days after a M5.4 event occurred along the Mendocino Fault.
 
These off shore seismic usually release a few M4+ events a month and the summer and fall of 1999 quiescence was unusual."
 

Update: 7:55 a.m., January 20, 2000.

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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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