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Location 1.590°N, 97.263°E
Depth 30 km (18.6 miles) set by location program
The quakes haven't caused any serious problems and sometimes even go unnoticed. Experts aren't sure why they are happening, but they do know they are happening frequently: Twelve were recorded in the area by July 1.
-- A moderate earthquake centered near Santa Rosa rattled Northern California on Wednesday evening as far north as Ukiah, all the way to Sacramento, and in San Francisco and well down the San Francisco peninsula.
With an epicenter nine miles southeast of Santa Rosa and three miles west of Glen Ellen, the quake's estimated magnitude was 4.4 to 4.6. There were no immediate reports of damage or injuries.
The Sonoma County Sheriff's office received about a dozen calls following the earthquake, but no one reported injuries or damages.
"Nobody's called for assistance, no one's reporting any problems," said Al Tupman, sheriff's office community service officer. "They were just letting me know that they felt it."