2026-08-21T04:19:32.78Z38.513668060303-122.427001953126.1999998092651manualconfirmedUSGS1.81md1Origin/20260821042204.323276.455279Magnitude/20260821042204.323338.455280USGS4 km ENE of Saint Helena, CAregion namenccatalognc75422217contributorID