HEALDSBURG (AP) — A magnitude-5 earthquake has rattled The Geysers region of Northern California, a rural area about 70 miles north of the San Francisco Bay Area.

A dispatcher with the Mendocino County Sheriff’s Department says the Ukiah office shook lightly just after 8:40 a.m. Wednesday but there were no calls reporting damage or injury.

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The U.S. Geological Survey says the quake’s epicenter was 4 miles west of The Geysers and about 15 miles north of Healdsburg.

The USGS says the region is tectonically active.

The Geysers is a large geothermal field where steam is withdrawn to generate electricity. Small earthquakes are not uncommon there.

California’s central coast was also rattled overnight by two 3.9-magnitude earthquake. San Luis Obispo County Sgt. Dave Nottenkamper says he felt a single sharp jolt just before 4 a.m. Wednesday.

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The U.S. Geological Survey says the quake’s epicenter was about five miles west of the small town of Templeton, 13 miles north of Morro Bay and 340 miles south of Sacramento.

The sergeant says there have been no reports of damage or injury.

Late Tuesday to the northeast a 3.9-magnitude quake struck in Mono County near the Mammoth Mountain ski resort.

The USGS says that quake occurred at 11:44 p.m. two miles from the town of Mammoth Lakes and 70 miles from Clovis.

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