2025-12-20T03:54:29.61Z37.7616653442383-121.9455032348636.61999988555908manualconfirmedUSGS1.93md1Origin/20251220035652.812414.4399Magnitude/20251220035652.812463.4400USGS4 km SE of San Ramon, CAregion namenccatalognc75283026contributorID