2025-12-08T18:13:38.98Z37.7649993896484-121.9378356933597.07999992370605manualconfirmedUSGS1.56md1Origin/20251208181734.329385.173665Magnitude/20251208181734.329437.173666USGS4 km ESE of San Ramon, CAregion namenccatalognc75276766contributorID