2025-12-20T03:56:09.75Z37.7436666666667-121.9531666666679.63manualconfirmedUSGS3.95mw1Origin/20251220114437.89866.7247Magnitude/20251220114437.898703.7248USGS5 km SSE of San Ramon, CAregion namenccatalognc75283031contributorID