USGS · EARTHQUAKE

M 0.4 · 8 km N of Anza, CA

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

Source agencyUSGS

Provider event IDci41349975

Magnitude0.4 ml

Depth14.5 km

Occurred / latest reportedOct 21, 2026, 4:26 AM UTC

Provider last updatedOct 21, 2026, 4:29 AM UTC

TerraPulse collectedOct 21, 2026, 4:30 AM UTC

Catalog statusautomatic

Reported geometryPoint

Location qualityValidated coordinate format (not accuracy assurance)

Country assignmentUnited States

Coordinates (lon, lat)-116.6797, 33.6307

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": [
    -116.679666666667,
    33.6306666666667,
    14.51
  ]
}

Revision observations

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

Collected2026-10-21T04:30:05.900Z· Provider update2026-10-21T04:29:29.897Z · Magnitude 0.42

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