2025-08-20T16:18:30.7Z37.8216667175293-122.055496215828.94999980926514manualconfirmedUSGS1.31md1Origin/20250820162106.335252.307858Magnitude/20250820162106.335306.307859USGS4 km SW of Alamo, CAregion namenccatalognc75226277contributorID