M3.9 earthquake near San Ramon, CA
| Information from UCB & USGS Menlo Park | |
| Date & Time (Local): | 2002/11/24 06:54:23 (PST) |
| Date & Time (UTC): | 2002/11/24 14:54:23 (UTC) |
| Location: | 3 km (2 miles) SE of San Ramon, CA 37.7602 -121.9502 |
| Depth (km): | 11.23 |
| Mw: | 3.9 |
A swarm of small to mild earthquakes occured in the area about 2 miles SE of San Ramon, CA. The swarm began with a magnitude 3.9 (Mw) earthquake which occurred at 06:54 AM PST on Sunday morning, November 24. A second mild earthquake occurred at 05:57 PM on Sunday evening, November 24, which has a magnitude of 3.8 (ML) and third event of ML 3.5 occurred Monday morning, November 25th, at 10:22 AM.
November 29, 10:30 PST: No events of M3 or higher have occurred in this sequence since Tuesday morning. The rate of events detected by the automatic systems has also slowed - a total of 124 events have been recorded in this swarm as of this time.
November 27, 09:00 PST: An ML 3.0 earthquake occurred this morning, at 05:26 PST. The sequence now consists of 7 events of M3 of higher. Over 113 events have been located in this swarm by the automatic systems as of this morning.
November 26, 04:38 PST: An ML 3.7 earthquake occurred this morning. The automatic systems have located over 50 events in this swarm, with 8 over magnitude 2.5.
For more information, please see the CISN Northern California Management Center report.
