USGS · EARTHQUAKE

M 0.4 · 88 km W of Adak, Alaska

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

Source agencyUSGS

Provider event IDav94456768

Magnitude0.4 ml

Depth7.2 km

Occurred / latest reportedOct 19, 2026, 10:39 AM UTC

Provider last updatedOct 20, 2026, 12:43 AM 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)-177.9117, 51.8647

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": [
    -177.911666666667,
    51.8646666666667,
    7.22
  ]
}

Revision observations

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

Collected2026-10-21T01:50:15.594Z· Provider update2026-10-20T00:43:31.360Z · Magnitude 0.43

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