More than 40 aftershocks were reported in the first two hours, including at least seven of magnitude-4.0 or greater, the USGS reported.
"People in the area should expect aftershocks for days following an earthquake of this size," said Jason Ballman with the Southern California Earthquake Center at the University of Southern California. "We’ve already seen a pretty vigorous aftershock sequence."
end partial quote from:
https://www.nbcbayarea.com/news/local/earthquakes/preliminary-m4-8-earthquake-strikes-in-san-joaquin-county/2589765/
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