M5.5 Earthquake Recorded Near 122 km W of Neiafu, Tonga

USGS Week reports M5.5 near 122 km W of Neiafu, Tonga, with a 195.2 km catalog depth.

Published 2026-10-12T05:20:50.360Z · Updated 2026-10-12T05:57:31.303Z

Update: the reporting agency revised this event's catalog depth from 164.8 km to 195.2 km.

The event began at Mon, 12 Oct 2026 04:38:12 GMT. USGS Week reports magnitude 5.5, 195.2 km catalog depth, and coordinates -18.723, -175.145.

The catalog location label is 122 km W of Neiafu, Tonga; 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 1.12e+13 joules, or about 2,682 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 465. 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 does not carry a tsunami flag at publication time. Magnitude, depth, and location can change as monitoring networks add observations and review the solution.