2026-06-15T18:45:09.23Z40.370334625244-121.304664611829.3900003433228manualconfirmedUSGS2.44md1Origin/20260615184647.28583.38218Magnitude/20260615184647.28589.38219USGS9 km NW of Chester, CAregion namenccatalognc75377181contributorID