Two earthquakes struck Northern California's Lake County area late Wednesday and early Thursday. - A magnitude 3.1 quake hit at 8:56 p.m.
Wednesday near Cobb. - A magnitude 4.2 quake followed at 2:42 a.m.
Thursday. - Both originated in the Geysers geothermal area at shallow depths.
- No injuries or major damage have been reported. The events highlight ongoing seismic activity in the region.