USGS · EARTHQUAKE

M 4.0 · 83 km S of Yonakuni, Japan

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

Source agencyUSGS

Provider event IDus6000tyjm

Magnitude4.0 mwr

Depth10.0 km

Occurred / latest reportedSep 30, 2026, 12:02 PM UTC

Provider last updatedOct 17, 2026, 11:57 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)122.8749, 23.7250

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": [
    122.8749,
    23.725,
    10
  ]
}

Revision observations

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

Collected2026-10-21T01:50:24.625Z· Provider update2026-10-17T23:57:13.040Z · Magnitude 4

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