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Two earthquakes hit Bay Area Thursday

4.0-magnitude quake in afternoon followed by 3.8 temblor in evening

The U.S. Geological Survey has downgraded Thursday night's earthquake from its original preliminary magnitude of 4.2, to 3.9 a short time later, and now experts report it was a 3.8-magnitude tremor.

The quake struck at 8:16 p.m. and was centered about one mile east of Berkley with a depth of 6 miles, the USGS said. The temblor created a large jolt in San Francisco and was felt throughout the region including Palo Alto, Danville, Santa Cruz, Oakland and Berkeley.

A 4.0-magnitude earthquake also struck the area at 2:41 p.m. Thursday. That quake was centered about two miles east-southeast of Berkeley and had a depth of 6.1 miles, according to the USGS. After Thursday's first quake, Keith Knudsen, deputy director of the USGS Earthquake Science Center in Menlo Park, said it was a standard Hayward Fault Line quake.

Knudsen said the temblor was of the typical "strike-slip" variety, in which two sides of the fault slide horizontally. Thursday's earthquakes occurred on the same day as the Great California ShakeOut, a statewide drill in which millions of Californians practiced ducking and covering at 10:20 a.m. Thursday morning.

Visit www.72hours.org for emergency planning resources and tips.

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— Bay City News Service

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Two earthquakes hit Bay Area Thursday

4.0-magnitude quake in afternoon followed by 3.8 temblor in evening

Uploaded: Fri, Oct 21, 2011, 10:21 am

The U.S. Geological Survey has downgraded Thursday night's earthquake from its original preliminary magnitude of 4.2, to 3.9 a short time later, and now experts report it was a 3.8-magnitude tremor.

The quake struck at 8:16 p.m. and was centered about one mile east of Berkley with a depth of 6 miles, the USGS said. The temblor created a large jolt in San Francisco and was felt throughout the region including Palo Alto, Danville, Santa Cruz, Oakland and Berkeley.

A 4.0-magnitude earthquake also struck the area at 2:41 p.m. Thursday. That quake was centered about two miles east-southeast of Berkeley and had a depth of 6.1 miles, according to the USGS. After Thursday's first quake, Keith Knudsen, deputy director of the USGS Earthquake Science Center in Menlo Park, said it was a standard Hayward Fault Line quake.

Knudsen said the temblor was of the typical "strike-slip" variety, in which two sides of the fault slide horizontally. Thursday's earthquakes occurred on the same day as the Great California ShakeOut, a statewide drill in which millions of Californians practiced ducking and covering at 10:20 a.m. Thursday morning.

Visit www.72hours.org for emergency planning resources and tips.

— Bay City News Service

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