NCSN is reporting the following earthquake near Coalinga, CA today:

26SEP2001 17:52:11 36.2N 120.3W ML=3.1 NCSN NE of Coalinga, CA

Note: This is the largest earthquake within 30 km of this epicenter
since April 16, 2000 when a Ml 3.2 occurred in the region. A Ml
3.8 also occurred on March 16, 2001 near this epicenter.
An earthquake of Ml 3.0 occurred near this location on Feb. 6, 2001.
There he been 7 events of Ml>=3 in this region in the past 3 years
(since 8-13-1998).

A swarm of earthquakes is also beginning in the Obsidian Butte/Niland
area. Earthquakes in this region of California commonly occur after
major geomagnetic storms affect the region as did yesterday's. This
swarm is likely to see events in the Ml>3 range before it is complete with
a good possibility of an Ml >=4 event along the way.

• Southern California earthquake list