Early morning Berkeley quake downgraded to Magnitude 4.4

Early morning Berkeley quake downgraded to Magnitude 4.4

The last time the fault produced a massive natural disaster was in 1868, when a 6.8-magnitude quake shook the region. A shallow event has a high probability to cause damage, though a much deeper event could be felt over more widespread area, he explained. Though the last big quake on the fault was a magnitude 7 in 1868, they are concerned about the recurrence rate which gauges how often you would expect a big natural disaster to happen on a given fault.

Social media posts showed people were awakened some 40 miles to the north and south, but there were no immediate reports of major damage or injuries.

"Looking historically at all the earthquakes that have happened in California, about 5 percent of the time earthquakes are followed by larger earthquakes", he said.

Drysdale said that depending on the magnitude of a quake in the Bay Area, Sacramentans could feel it despite having no known fault lines in the area.




In the last 10 days, there has been one quake of magnitude 3.0 or greater centered nearby. A magnitude 6.8 quake occurred on October 21, 1868, and was known at the time as the "Great San Francisco natural disaster".

"Woke up screaming, which scared my husband more than the quake", one wrote on SFGate's Facebook page. "It may mean less likelihood of a larger quake to follow". The last big quake occurred in 1868 so we are about at the 150-year anniversary ...

A spokesman for the California Governor's Office of Emergency Services said there were no reports of harm to the region.

Knudson said the USGS had learned earthquakes, at least on the southern part of the Hayward Fault, occur every 140, 150 to 160 years.

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