Special Reports
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ML 4.1

6.6 km (4.1 miles)

The North California Coast Range rattles with M4.1 quake.

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December 7, 2001

A light earthquake registering a magnitude Ml 4.1 (NCSN) rolled through the northern California Coast Range this morning, jarring many people from sleep but not causing any serious damage.

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According to the Northern California Seismic Network (NCSN) the earthquake occurred at 14:29 GMT or 6:29 a.m., December 7, about 9 miles southeast of Ukiah and about 4 miles northwest of Hopland along the western flank of the Mayacmas Mountains in the Russian River valley. See a Topozone location map.

It occurred along the Ukiah segment of the Maacama fault zone at a depth of 6.6 km.

People were woken by the jolt, reporting a sharp jolt followed by a rolling sensation of the ground. Walls vibrated and caused pictures to rattle. Windows and glassware jiggled, and hanging plants swung. Some people were spooked, while others were charged with excitement. Nothing toppled from tables or shelves.

There have been some light aftershocks, the largest of which registered M2.5.

Earthquake activity registering M4.0 or stronger in the Northern California Coast Range has been rather light this year, as quake is only the second tremor, following a M4.0 in the Alder Springs area on February 2.

Additional seismic information links:

Mainstream media news reports:
  • Quake shakes Mendocino, Lake (Santa Rosa Press Democrat) Dec. 8, 2001
Report update: 1:23:08 PM, Friday, December 14, 2001

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