According to the US Geological Survey, a magnitude 3.7 earthquake rocked Hayward in Bay Area City just before 2pm on Thursday.
Temblor followed three previous small earthquakes. It was a mile with a 2.7 impact near the Hayward Fault at 5:03am, followed by a 3.3 size at 11:52am, followed by a 3.2 miles at 11:54am. East of East Bay City, the agency said.
The first earthquake occurred about 3.3 miles deep. Second, 3.5 miles. Third, 3.8 miles. Fourth, 4.4 miles.
According to the USGS, about 4,000 people reported feeling the largest of the four earthquakes.
There was a slight shaking around Hayward. Residents of Vallejo to the north, Sunnyvale to the south and San Jose to the north reported weak shaking.
Previous reports from the USGS focus on the dangers posed by the Hayward fault. Though it is less of a more common name than the San Andreas fault, the Hayward fault poses a significant risk, the agency said in its 2018 report.
Hayward faults are particularly dangerous as they pass through the most densely populated parts of the Bay Area, spanning the length of the East Bay from San Pablo Bay to Berkeley, Auckland, Hayward, Fremont and Milpitas.
According to a data sample over the last three years, California and Nevada experience an average of 234 earthquakes each year, magnitudes ranging from 3.0 to 4.0.
QuakeBot, a computer application that monitors the latest earthquakes detected by USGS, contributed to this article. If you want to learn more about the system, check out our list of frequently asked questions.
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Times staff writer Longgonlin II contributed to this report.
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