2025-12-08T11:00:40.27Z37.755500793457-121.9431686401377.78000020980835manualconfirmedUSGS2.21md1Origin/20251208110335.872844.169890Magnitude/20251208110335.872905.169891USGS4 km SE of San Ramon, CAregion namenccatalognc75276381contributorID