USGS · EARTHQUAKE

M 4.2 · Rat Islands, Aleutian Islands, Alaska

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

Source agencyUSGS

Provider event IDus6000u3de

Magnitude4.2 mb

Depth52.2 km

Occurred / latest reportedOct 19, 2026, 4:27 PM UTC

Provider last updatedOct 19, 2026, 5:32 PM UTC

TerraPulse collectedOct 21, 2026, 1:50 AM UTC

Catalog statusreviewed

Reported geometryPoint

Location qualityValidated coordinate format (not accuracy assurance)

Country assignmentOffshore, non-point or unassigned

Coordinates (lon, lat)178.3686, 51.5183

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": [
    178.3686,
    51.5183,
    52.174
  ]
}

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 update2026-10-19T17:32:04.487Z · Magnitude 4.2

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