Two earthquakes struck within one second of each other northwest of Port-Olry, Vanuatu, on October 20, 2026, prompting a tsunami warning, according to the USGS.
The first quake registered magnitude 6.6 and hit at 04:20:37 UTC. Its epicenter was 195 km northwest of Port-Olry, at coordinates 13.869°S, 165.713°E, with a depth of 10.00 km (6.21 miles). One second later, a magnitude 6.3 quake struck at 04:20:38 UTC, with its epicenter 204 km west-northwest of Port-Olry at 14.028°S, 165.484°E, also at a depth of 10.00 km (6.21 miles).
The Tsunami Warning Center issued a warning in connection with the 6.3 event, the USGS said.