| Information from UCB & USGS Menlo Park | ||
| Date & Time (Local): | 2001/12/07 06:29:09 (PDT) |
2001/12/14 01:41:05 (PDT) |
| Date & Time (UTC): | 2001/12/07 14:29:09 (UTC) |
2001/12/14 09:41:05 (UTC) |
| Location: | 14 km (9 miles) SSE of Ukiah, CA 39.042, -123.115 |
14 km (9 miles) SSE of Ukiah, CA 39.045, -123.120 |
| Depth (km): | 6.9 | 6.9 |
| ML: | 4.1 | 4.1 |
| MW (preferred): | 4.3 | 4.4 |
| Fault Zone: | Maacama | |
The Ukiah area recently experienced two M4.0+ events. The first, which occurred on December 7, had a local magnitude (ML) of 4.1 and moment magnitude (Mw) of 4.3. The December 14 event was located just northwest of the December 7th earthquake, both of which occurred along the Maacama Fault Zone. This fault zone is thought to slip at a rate of about 9mm/year, similar to the slip rate along the Rodgers Creek and Hayward Fault Zones that continue to the south.
More information about the earthquake potential of the Maacama Fault and other faults in this region can be found in a 1996 USGS report on Northern California Earthquake Potential, particularly in the section on North Coast faults.
