M5.6 Shallow Earthquake Recorded Near South of Mariana Islands

Updated: GEOFON GFZ upgraded this solution from M5.5 to M5.6. GEOFON GFZ reports M5.6 near South of Mariana Islands, with a 10.0 km catalog depth.

Published 2026-10-27T23:34:05.270Z · Updated 2026-10-27T23:36:05.291Z

Update: the reporting agency changed this event's magnitude from M5.5 to M5.6. The current value is shown throughout this brief; the earlier value is retained here as revision history.

The event began at Tue, 27 Oct 2026 23:14:07 GMT. GEOFON GFZ reports magnitude 5.6, 10.0 km catalog depth, and coordinates 12.820, 143.091.

The catalog location label is South of Mariana Islands; no separate nearest-city field was supplied with this solution. By catalog depth, this is a shallow event. The magnitude-derived energy estimate is 1.82e+13 joules, or about 4,349 tons of TNT equivalent; that calculation describes source energy, not local damage.

The current catalog entry does not include a public felt-report count. No separate intensity or catalog-significance detail is available from this provider record. No official casualty or damage statement is attached to the normalized event evidence.

GEOFON GFZ has not supplied a review status in the normalized record. 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.