ALDER SPRINGS – A 3.0-magnitude earthquake – followed by several smaller shakers – was reported Friday morning in the Mendocino National Forest.

The quake, originally measured at 3.2 but later downgraded by the US Geological Survey, occurred at 9:05 a.m.

The epicenter was six miles west of the Alder Springs area, 17 miles north northeast of Lake Pillsbury, 17 miles west northwest of Stony Gorge Reservoir and 39 miles north northeast of Ukiah, the US Geological Survey reported. The quake was recorded at a depth of 3.4 miles.

The US Geological Survey received one shake report – from Redwood City, 242 miles away, according to records.

Over the course of the day, three more quakes near Alder Springs were reported – one measuring 2.0 in magnitude and two measuring 1.3, and all centered either to the west or to the west southwest of Alder Springs, the US Geological Survey reported. Depths for the quakes ranged between 1.7 and 5.3 miles.

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