UPDATE: The magnitude of a Southern California coastal earthquake has been revised upward slightly to 4.8.
An earthquake with a preliminary magnitude of 4.6 has rattled part of the Southern California coast.
The U.S. Geological Survey says the 7:38 a.m. Wednesday temblor was centered 3 miles west of Isla Vista in Santa Barbara County.
A Santa Barbara County sheriff's dispatcher says deputies felt the jolt, but there are no damage or injuries or calls from the public.
Authorities also say there's no danger of a tsunami.
The epicenter is in the Santa Barbara Channel region about 100 miles west of Los Angeles.
