M5.0 Earthquake Near 236 km ESE of Attu Station, Alaska Carries Provider Tsunami Flag

USGS Week reports M5.0 near 236 km ESE of Attu Station, Alaska, with a 10.0 km catalog depth.

Published 2026-09-04T23:41:26.661Z

The event began at Fri, 04 Sep 2026 02:28:38 GMT. USGS Week reports magnitude 5.0, 10.0 km catalog depth, and coordinates 51.956, 176.348.

The catalog location label is 236 km ESE of Attu Station, Alaska; no separate nearest-city field was supplied with this solution. By catalog depth, this is a shallow event. The magnitude-derived energy estimate is 2.00e+12 joules, or about 477 tons of TNT equivalent; that calculation describes source energy, not local damage.

The current catalog entry does not include a public felt-report count. Other attached observation fields include catalog significance score 385. No official casualty or damage statement is attached to the normalized event evidence.

The USGS Week catalog currently marks the solution as reviewed. No station-count, phase-count, residual, gap, or uncertainty fields were supplied in the normalized record. No alternate network solution is attached to this record.

The provider record carries a tsunami-related flag. That field is not itself a warning; readers should check the issuing tsunami warning center and local officials. Magnitude, depth, and location can change as monitoring networks add observations and review the solution.