USGS · EARTHQUAKE

M 1.1 · 27 km ENE of Seeley Lake, Montana

A reported observation from the original data provider. Values may be revised as new information becomes available.

Source agencyUSGS

Provider event IDmb90210793

Magnitude1.1 ml

Depth5.0 km

Occurred / latest reportedOct 17, 2026, 9:28 AM UTC

Provider last updatedOct 18, 2026, 11:08 PM UTC

TerraPulse collectedOct 21, 2026, 1:50 AM UTC

Catalog statusreviewed

Reported geometryPoint

Location qualityValidated coordinate format (not accuracy assurance)

Country assignmentUnited States

Coordinates (lon, lat)-113.1642, 47.3048

GDACS alertNot applicable

Magnitude measures earthquake size; intensity describes shaking at a location. Magnitude alone does not establish casualties or damage.

USGS tsunami flag:0 (not set). This flag does not confirm a tsunami or an official tsunami warning. Consult official warning centers.

Original reported GeoJSON geometry

{
  "type": "Point",
  "coordinates": [
    -113.164166666667,
    47.3048333333333,
    5
  ]
}

Revision observations

Changes observed since TerraPulse began collecting this event; this is not a complete provider revision history.

Collected2026-10-21T01:50:16.849Z· Provider update2026-10-18T23:08:49.350Z · Magnitude 1.11

Geographic proximity only; events have not been merged or confirmed as related. Distances use the first reported coordinate for non-point geometries.