The California coast was shaken by seven earthquakes in less than 24 hours, raising concerns among residents about the potential arrival of "The Big One." The United States Geological Survey (USGS) detected a 3.

Parts of Northern and Southern California have felt light shaking from earthquakes early this week. Here's how strong they were and which cities were closest to the epicenters.

A 3.6-magnitude earthquake shook the Southern California area — the third tremor to hit the area Monday, Feb. 10, the U.S. Geological Survey reported. The about 5-mile deep quake hit about 3 miles northeast from San Bernardino just before 10 p.m., according to the USGS.