The quakes come as California sees the effects of an atmospheric river that has caused flash flooding, rescues, and landslides.

Moderate shaking was reported near the quake's epicenter, with light shaking reported as far east as Redding, north into Klamath Falls, Ore., and as far south as Sacramento, according to the USGS.

The area around San Ramon has recorded 91 quakes stronger than magnitude 2 over November and December, through Tuesday morning. That tally is the highest on record for the area for a two-month period, according to a Chronicle analysis of U.S. Geological Survey data.

A preliminary 4.1 magnitude earthquake struck Sunday afternoon near Glen Ellen in Sonoma County, according to the United States Geological Survey.

There was no tsunami threat to the Marianas from the earthquake, and no major damages or injuries were reported.

A strong, 6.6-magnitude earthquake struck in the Philippine Sea on Saturday, according to the United States Geological Survey. The temblor happened at 11:05 p.m. Taiwan time about 19 miles southeast of Yilan, Taiwan, data from the agency shows. U.S.G.S. data earlier reported that the magnitude was 6.7.

This comes as landslides, earthquakes, and relentless rain have impacted the area this week. Concrete rests at the confluence of the Baker and Skagit rivers -- just north of town is the Lower Baker Dam. RELATED: Western Washington braces for another storm as heavy rain threatens more flooding havoc

Jack Creek Farms experienced 78 measurable earthquakes from Nov. 18 to Dec. 22, according to the U.S. Geological Survey. Earthquakes always occur on a fault, which is a break in the Earth’s crust where blocks of rock can move back and forth, Lozos said.

Underwater earthquakes can trigger massive phytoplankton blooms, linking deep-sea seismic activity to ocean life and carbon cycling.

There have been at least two earthquakes this year within 20 miles of one another. We spoke with an expert about what this means.