A small, little known fault appears to be responsible for producing the 4.7 earthquake that broke east of Oroville at 11:37 p.m. on Wednesday, shaking a wide area of Northern California, from Santa Cruz to Mountain Shasta, the US Geological Survey said. The quake, which began 8.5 miles deep, happened between Truckee and Portola, two thinly populated areas. But it was widely felt way to the southeast, in Carson City, Nevada. There's also a report that 57 people in the Oroville area contacted USGS by the Internet to say that they had felt the quake.

Also in Northern California, there was a 3.6 quake at 5:36 a.m. Thursday in the Berkeley area. Authorities said the quake was produced by the Hayward fault, one of the most dangerous faults in California. said that today's quake did not cause any significant damage.

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