2025-12-08T12:19:42.53Z37.7516670227051-121.9451675415046.59000015258789manualconfirmedUSGS1.54md1Origin/20251208122216.879352.170550Magnitude/20251208122216.879403.170551USGS4 km SE of San Ramon, CAregion namenccatalognc75276466contributorID