Home

News & Updates

Who we are

Research Activities

Geophysical Networks

Map of California & Nevada earthquakes

More Earthquake Information

Education and Outreach

Annual Report

BSL Directory

Site Index

Search

31 March 2003, 17:05 PST

A minor earthquake struck 6 mi SSE of Parkfield this evening. The local magnitude for this event is 3.0 (ML).

29 March 2003, 02:35 PST

A mild earthquake occurred at 02:35 AM early Sunday morning, March 30. This epicenter was located about 8 miles NNW of Burney. The local magnitude for this event is 3.2 (ML).

28 March 2003, 15:39 and 15:40 PST

Two mild earthquakes occurred in the area about 13 miles WSW of Chico on Friday afternoon, March 28. The first event occurred at 03:39 PM and the second about 1 minute later at 03:40 PM. The local magnitudes for the earthquakes are 3.3 and 3.5 (ML) respectively.

24-25 March 2003

It is worth noting that overnight, from March 24 and on into March 25, we have been experiencing a swarm of small earthquakes located along the Hayward Fault in south Berkeley. The closest stations of the Hayward Fault Network have picked up as many as a couple of dozen of these events, the largest of them being a magnitude 2.5 earthquake which occurred at on Monday March 24 at 04:56 PM.

Update: More than 30 of these small events had occurred as of mid day on March 26. Most were recorded at too few stations for calculating a formal hypocenter, but there location was inferred by the shape of the wave form and P and S arrivals.

24 March 2003, 17:28 PST

A mild earthquake occurred at 05:28 PM on Monday afternoon, March 24. This earhquake was located about 3 miles ESE of The Geysers, south of Lear Lake, CA. The local magnitude for this event is 3.3 (ML).

19 March 2003, 02:44 PST

A mild earthquake occurred at 02:44 AM on Wednesday morning, March 19. This earhquake was located about 8 miles NE of Mammoth Lakes. The local magnitude for this event is 3.2 (ML). This event is the last of a string of at least 3 small to mild earthquakes, which makes it difficult to pick the events apart.

18 March 2003, 11:27 PST

A mild earthquake occurred at 11:27 AM on Tuesday morning, March 18. This epicenter was located about 17 miles NW of Bishop. The local magnitude for this event is 3.2 (ML).

14 March 2003, 10:22 PST

A mild earthquake occurred at 10:22 AM on Friday morning, March 14. This epicenter was located about 4 miles S of The Geysers and had a local magnitude of 3.5 (ML).

12 March 2003, 15:41 PST

A large earthquake occurred at 03:41 PM on Wednesday afternoon, March 12 located in the Gulf of California about 50 miles ENE of Loreto, Baja California. The moment magnitude reported by the USGS is 6.4 (Mw). The event was felt at Loreto and Mulege, Baja California.

12 March 2003, 15:41 PST

A moderate earthquake occurred in Southern California about 17 miles NNW of Twentynine Palms. The origin time of the event was 11:28 AM Tuesday morning, March 11, and the magnitude averaged over the Berkeley Network is 4.8 (ML). The defining magnitude reported by the Southern California Seismic Network was 4.4. The earthquake was reported felt with MM Intensity (IV) at Joshua Tree and Twentynine Palms; (III) at Barstow, Palm Springs, San Diego and Yucca Valley; it was also felt at Cathedral City and Hemet.

11 March 2003, 03:15 PST

A mild earthquake occurred at 03:15 AM early Tuesday morning, March 11. This epicenter was located about 6 miles S of San Juan Bautista and had a magnitude of 3.0 (ML).

8 March 2003, 13:00 PST

Yesterday's observation about the lack of large events was immediately challenged by a magnitude 4.1 (Mw) event 11 km SE of Mammoth Lakes, outside of the caldera. The event has been followed by a series of small aftershocks, and a mild event of magnitude 3.4 (ML) which occurred at 09:36 PM on Saturday night, March 8.

This is the first M4 event in this area since 1999. The USGS Volcano Hazards Program posts the current conditions at Long Valley caldera.

7 March 2003, 14:11 PST

Although not within Northern California, there was a regional earthquake located off the Oregon coast about 145 miles west of Coos Bay which occurred at 02:11 PM on Friday afternoon, March 7. This event had a magnitude of 4.7 (ML).

7 March 2003, 13:00 PST

It is worth noting that as of today, we have had no magnitude 3.0 and larger earthquakes in Northern California during the last week.