California experienced a series of seven earthquakes in under a day, particularly around Hayward and Petrolia, prompting fears of a potential 'Big One.' The strongest recorded was a 3.7 magnitude quake detected in Hayward. Key fault lines in these areas, such as the Hayward Fault and the San Andreas Fault, have been closely monitored due to their potential for significant seismic activity. Scientists warn that the region is overdue for a major earthquake, which could result in substantial damage and loss of life.
The Hayward Fault runs along the foot of the East Bay hills. The last major earthquake hit on October 21, 1868, measuring a 6.8 magnitude.
Those earlier earthquakes near Petrolia were centered roughly 20 miles apart from each other off the coast, indicating the tectonic activity in the area.
The tremors near Petrolia hit on the San Andreas fault that scientists have been monitoring due to it being overdue for a major event.
USGS says the first tremor hit at 2:06 am ET, measuring a 3.3 magnitude, indicating ongoing seismic activity in California.
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