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.

A 3.4-magnitude earthquake struck Southern California, then a 3.2 quake followed, the U.S. Geological Survey reported. /iStockphoto UPDATE: Just hours after back-to-back earthquakes shook the Northern California area,