2026-09-18T02:12:09.25Z38.494499206543-122.55566406257.6500000953674manualconfirmedUSGS1.77md1Origin/20260918021406.333946.91051Magnitude/20260918021406.334008.91052USGS8 km W of Saint Helena, CAregion namenccatalognc75437612contributorID