2026-10-21T10:23:30.82Z45.231333333333-111.2841666666712.92manualconfirmedUSGS1.02ml1Origin/20261022192421.089598.106579Magnitude/20261022192421.089661.106580USGS8 km SE of Big Sky, Montanaregion namembcatalogmb90211118contributorID