2026-09-10T01:24:48.04Z40.290833333333-124.5318333333320.44manualconfirmedUSGS3.6mw1Origin/20260910211606.289002.42114Magnitude/20260910211606.289061.42115USGS21 km W of Petrolia, CAregion namenccatalognc75432942contributorID