A magnitude 6.4 earthquake struck off the province of Davao Occidental in the southern Philippines on Sunday.
The Philippine Institute of Volcanology and Seismology (Phivolcs) upgraded from an initial measurement of magnitude 6.1.
There were no immediate reports of casualties or damage.
The epicentre was 126 km southeast of Jose Abad Santos town, Phivolcs said.

Trump heads to Tokyo for trade, security talks before Xi summit
Two climbers die in Nepal after expeditions to Ama Dablam mountain
Melissa develops to Category 4 hurricane as Jamaica braces for impact
More than 8,000 US flights delayed as air traffic control absences persist
Lithuania shuts Vilnius airport, Belarus border for fourth time
