The 4.2 magnitude earthquake that struck off Petrolia, California, is the strongest aftershock following a 7.0 quake, occurring Friday morning at 6:36 a.m.
According to the United States Geological Survey, there have been eight aftershocks in the area since the initial 7.0 quake, measuring between 2.5 and 4.2.
The aftershocks from Thursday's significant earthquake have mostly been concentrated within a 10 to 40 mile radius from Petrolia, highlighting the seismic activity in the region.
The series of aftershocks, highlighted by the 4.2 quake, demonstrates the ongoing seismic instability following last Thursday's powerful earthquake, indicating continued monitoring is necessary.
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