2026-10-21T16:48:00.2Z37.40283203125-121.74400329591.25manualconfirmedUSGS1.25md1Origin/20261021164950.540771.97747Magnitude/20261021164950.540832.97748USGS8 km ENE of Alum Rock, CAregion namenccatalognc75452906contributorID