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- Notations:
- An earthquake registering a preliminary magnitude of ML 4.2 (NCSN) , Mw 4.5 (UCB) was detected at 22:32:07 UTC (3:32 p.m. PDT), May 17, 2000 in the Coast Range of Northern California.
- The quake was centered about 18 miles northeast of Ukiah, 6 miles west of Lake Pillsbury and 4 miles north of Potter Valley, near Van Arsdale Reservoir.
- The focal point was placed at a depth of 7 km and the fault plane solution from the U.C. Berkeley indicated predominantly strike-slip motion along a northwest trending plane.
- Preliminary reports indicate the quake sharply felt in Potter Valley and as far away as Ukiah and Willits. Windows jiggled, hanging plants swung and glassware tinkled, but there were no reports of items toppling from tables and shelves. Some people though the shaking felt like a passing truck.
- The activity occurred between the Maacama and Bartlett Springs faults zone, the most prominent faults in the northern Coast Range, and probably along the unnamed fault which makes up the eastern side of Potter Valley.
- Interestingly, this area has shown elevated microseismicity during the past few weeks which has included several M1's and M2's and more recently, a M3.0 on May 13. There has been a few M2 aftershocks within the first few hours.
- It was the first M4 activity in the northern Coast Range since the Cloverdale earthquake swarm in mid January which included a trio of M4's (M4.3, 1/11; M4.3, 1/12; M4.2, 1/18).
Update: 4:50 p.m., May 17, 2000.
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