USGS · EARTHQUAKE

M 4.6 · South Sandwich Islands region

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

Source agencyUSGS

Provider event IDus6000tyab

Magnitude4.6 mb

Depth33.4 km

Occurred / latest reportedSep 29, 2026, 4:16 AM UTC

Provider last updatedOct 20, 2026, 2:21 AM 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)-28.2067, -55.3044

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": [
    -28.2067,
    -55.3044,
    33.409
  ]
}

Revision observations

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

Collected2026-10-21T01:50:25.256Z· Provider update2026-10-20T02:21:54.040Z · Magnitude 4.6

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