Seismo-Watch, Your Source for Earthquake Information EARTHQUAKE EPICENTER 
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NORTHERN CALIFORNIA 
GLOBAL 
WESTERN GREAT BASIN 
SOUTHERN CALIFORNIA
- Notations:
- An earthquake registering a preliminary magnitude of ML 4.0 (NCSN), Mw 4.0 (UCB occurred at 15:25:56 UTC (7:26 a.m. PST), February 26, in Central California. The focal point was placed at 5 km beneath the surface for quick processing and the University of California, Seismological Laboratory, fault plane solution suggested strike-slip motion along a northwest trending fault plane.
- The quake was centered on the San Andreas fault about 5 miles north-northwest of Parkfield near Middle Mountain (see map).
- Seismo-Watch has received felt reports from as far away as Paso Robles, about 20 miles to the southwest. The quake was not large enough to cause any items to topple from tables and shelves.
- The quake occurred within the "Parkfield Experiment", a segment of the San Andreas fault thought to be the initiation spot for a major earthquake in the future. This quake will trigger emergency response personnel into a ready position. We do not have the statistics of foreshock probability at this time and will keep you informed of any developments.
- Click here for more info about the USGS Parkfield experiement.
Here is a list of M4+ earthquakes in the Parkfield area since 1975:- Notations:
1975/01/06 11:17:12.11 35.9427 -120.5142 10.81 M4.40 1975/09/13 21:20:58.99 35.9967 -120.5463 11.21 M4.80 1982/06/25 03:58:23.15 35.9730 -120.5207 8.76 M4.00 1987/10/01 14:49:48.21 36.1200 -120.7640 14.12 M4.60 1992/10/20 05:28:08.90 35.9285 -120.4728 10.21 M4.30 1993/04/04 05:21:25.27 35.9413 -120.4925 7.65 M4.20 1993/11/14 12:25:34.87 35.9527 -120.4968 11.70 M4.60 1994/12/20 10:27:47.17 35.9175 -120.4643 9.10 M4.70 1999/02/26 15:25:56.70 35.95 -120.49 10.50 M4.05
- Time is GMT.
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