2026-08-18T10:08:33.88Z37.407333374023-122.225669860843.4100000858307manualconfirmedUSGS1.1md1Origin/20260818101111.928396.421057Magnitude/20260818101111.928458.421058USGS3 km NNE of Portola Valley, CAregion namenccatalognc75420537contributorID