A moderate earthquake with an epicenter in Lake County gave portions of Northern California residents a New Year’s Day rattle, according to seismologists.

The earthquake occurred at 6:34 p.m. Pacific time and was initially registered as a magnitude-4.7 temblor, according to the U.S. Geological Survey. It struck at a depth of just over a mile beneath the surface, based on measurements by seismographs, the agency said.

The quake epicenter was 2 miles north-northwest of Cobb, a small community in the hills south of Clear Lake. The epicenter was 70 miles west of Sacramento and 27 miles north of Santa Rosa. A ShakeAlert was issued to cellphone users in portions of Lake, Sonoma, Napa and Mendocino counties, according to the USGS.

Wednesday’s temblor was relatively small compared with December’s magnitude-7.0 earthquake, which struck 40 miles off the coast of Mendocino County. The fault slip on Dec. 5 triggered a tsunami alert that was briefly activated. Four days later, a magnitude-5.5 quake in a remote Nevada desert was widely felt in the Sacramento region.

There were no reports of injuries from the shaking, which was lightly felt in parts of the Sacramento Valley.

The shaking was more pronounced closer to the epicenter.

Kim Fetters, who answered the phone just before closing time at Cobb Mountain Pizza, said the quake “shook the building pretty good.”

“I was expecting a window to break or something,” she said.

Fetters said while she felt last month’s strong quake off the coast, Wednesday evening’s shaking from just a mile away was “worse” since it was a sharp jolt.

She said no one in the pizza parlor was hurt but “a few beer bottles” had fallen to the ground.

Earthquakes in the magnitude range of 4.0 to 4.9 are generally considered light to moderate, though their effects can vary based on depth, proximity to population centers and local geology, seismologists say.

Northern California is accustomed to frequent earthquakes, particularly in areas like Cobb and The Geysers, where geothermal activity can trigger smaller quakes regularly. As a result, a 4.7 quake, while noticeable but common.

Nearly a half-hour after the shaking, more than 800 people responded to the USGS’ “Did You Feel It?” feature, which accepts responses from the public. The bulk of the survey answers were scattered across the Mayacamas Mountains section of the Coast Range with a handful of responses in the capital region, mostly in Solano County. Shaking was felt in San Francisco, about 85 miles south, and across the northern tier of the bay, according to the volunteer responses.

According to USGS records, 22 earthquakes have occurred within 50 miles of the epicenter in the last 100 years — the largest of which was the magnitude-6.0 quake that destroyed buildings in Napa in 2014, which was the largest quake in Northern California since the 1989 Loma Prieta quake.

The 2014 South Napa quake killed one person, injured about 200 residents and caused close to $1 billion in damages.