Seismo-Watch

Special Earthquake Report No: 00-005

Regional Location:

Preliminary Magnitude:

Moment Magnitude:

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

COAST RANGE, NORTHERN CALIFORNIA

ML 4.2 (NCSN)

Mw 4.5 (U.C. BERKELEY)

00/05/17
22:32:07
39.39N
123.07W
7 km
A

Seismo-Watch,
Your Source for
Earthquake Information

EARTHQUAKE EPICENTER
MAP
 
(image not available at this time)

TRACK GLOBAL AND REGIONAL SEISMIC ACTIVITY WITH SEISMO-WATCH EARTHQUAKE REPORTS
 
 
GLOBAL

NORTHERN CALIFORNIA

WESTERN GREAT BASIN

SOUTHERN CALIFORNIA

Other Seismo-Watch Special Earthquake Reports
Notations:
An earthquake registering a preliminary magnitude of ML 4.2 (NCSN) , Mw 4.5 (UCB) was detected at 22:32:07 UTC (3:32 p.m. PDT), May 17, 2000 in the Coast Range of Northern California.
 
The quake was centered about 18 miles northeast of Ukiah, 6 miles west of Lake Pillsbury and 4 miles north of Potter Valley, near Van Arsdale Reservoir.
 
The focal point was placed at a depth of 7 km and the fault plane solution from the U.C. Berkeley indicated predominantly strike-slip motion along a northwest trending plane.
 
Preliminary reports indicate the quake sharply felt in Potter Valley and as far away as Ukiah and Willits. Windows jiggled, hanging plants swung and glassware tinkled, but there were no reports of items toppling from tables and shelves. Some people though the shaking felt like a passing truck.
 
The activity occurred between the Maacama and Bartlett Springs faults zone, the most prominent faults in the northern Coast Range, and probably along the unnamed fault which makes up the eastern side of Potter Valley.
 
Interestingly, this area has shown elevated microseismicity during the past few weeks which has included several M1's and M2's and more recently, a M3.0 on May 13. There has been a few M2 aftershocks within the first few hours.
 
It was the first M4 activity in the northern Coast Range since the Cloverdale earthquake swarm in mid January which included a trio of M4's (M4.3, 1/11; M4.3, 1/12; M4.2, 1/18).
 

Update: 4:50 p.m., May 17, 2000.

Did you feel this tremor? .
 
A similar copy of this earthquake report was sent to subscribers of the Seismo-Watch Earthquake Fax Alert Bulletins within an hour of the event.

Feel free to browse other Seismo-Watch Special Earthquake Reports.

Stay informed, Stay Safe. Subscribe to Seismo-Watch Global and Regional Earthquake Reports. Six global and regional earthquake reports to choose from, including three FREE Brief Regional Reports. Stay informed with FREE e-mail updates to the Seismo-Watch Online Earthquake Reports.

Don't forget our FREE Brief Central California Earthquake Report! Covering all the earthquake activity for the Central California region, including the ever active creeping segments of the San Andreas and Calaveras faults.
 
Updated weekly. Subscribe to our FREE Update e-mail messages NOW.

Have you seen our FREE Brief Western Great Basin Earthquake Report! Covering earthquake activity for the California/Nevada border region, including detailed activity of the Mammoth Lakes area.
 
Updated weekly. Subscribe to our FREE Update e-mail messages NOW.

You can't miss our FREE Coachella Valley Earthquake Report! Covering magnitude M1+ earthquake activity in the Palm Springs area from the southern Landers aftershock zone to the locked Coachella Valley segment of the San Andreas fault.
 
Updated weekly. Subscribe to our FREE Update e-mail messages NOW.

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.
Copyright © 1999 Advanced Geologic Exploration, Inc.
Voice: 775-852-0992 / Fax: 775-852-3226
e-mail:
Web Site: https://seismo-watch.com
Re-transmission prohibited. All rights reserved.
NEWS MEDIA: Please cite Seismo-Watch as your source


Seismo-Watch, Inc.
P.O. Box 18012 , Reno, NV 89511-8012
Toll Free 24 hour Message Line 1-800-852-2960
Office: 775-852-0992 / Fax: 775-852-3226
e-mail: