2025-12-20T04:06:05.59Z37.7495002746582-121.9371643066416.55999994277954manualconfirmedUSGS1.6md1Origin/20251220040801.523358.4539Magnitude/20251220040801.523408.4540USGS5 km SE of San Ramon, CAregion namenccatalognc75283061contributorID