MANILA—A magnitude-5.1 earthquake struck off Davao Occidental early Wednesday, Phivolcs said.
The tremor, which happened 118 kilometers southeast of Jose Abad Santos town at 4:08 a.m., was tectonic in origin and had a depth of 91 kilometers, according to Phivolcs.
The tremor was not expected to cause damage but will spawn aftershocks, state seismologists said.
An Instrumental Intensity I was reported in General Santos City and Koronadal City in South Cotabato and the towns of Alabel and Kiamba in Sarangani.
A magnitude-6.1 quake hit Mindanao in February, leaving at least 3 injured.
The Philippines is situated on the Pacific "Ring of Fire," an arc of intense seismic activity that stretches from Japan through Southeast Asia and across the Pacific basin.
--With a report from Agence France-Presse