USGS · EARTHQUAKE

M 0.9 · 32 km ENE of Adak, Alaska

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

Source agencyUSGS

Provider event IDav94458938

Magnitude0.9 ml

Depth1.5 km

Occurred / latest reportedOct 20, 2026, 7:36 PM UTC

Provider last updatedOct 21, 2026, 4:18 AM UTC

TerraPulse collectedOct 21, 2026, 4:20 AM UTC

Catalog statusreviewed

Reported geometryPoint

Location qualityValidated coordinate format (not accuracy assurance)

Country assignmentOffshore, non-point or unassigned

Coordinates (lon, lat)-176.1893, 51.9823

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": [
    -176.189333333333,
    51.9823333333333,
    1.49
  ]
}

Revision observations

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

Collected2026-10-21T04:20:05.816Z· Provider update2026-10-21T04:18:21.910Z · Magnitude 0.86

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