M6.4 Earthquake Near 163 km WSW of Nikolski, Alaska Carries Provider Tsunami Flag

USGS Week reports M6.4 near 163 km WSW of Nikolski, Alaska, with a 114.8 km catalog depth and 2 felt reports.

Published 2026-09-17T14:42:40.461Z

The event began at Thu, 17 Sep 2026 14:19:53 GMT. USGS Week reports magnitude 6.4, 114.8 km catalog depth, and coordinates 52.544, -171.186.

The catalog location label is 163 km WSW of Nikolski, Alaska; no separate nearest-city field was supplied with this solution. By catalog depth, this is an intermediate-depth event. The magnitude-derived energy estimate is 2.51e+14 joules, or about 60,036 tons of TNT equivalent; that calculation describes source energy, not local damage.

2 public felt reports are attached to the current catalog entry. Other attached observation fields include catalog significance score 631. 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.