A magnitude-6.4 quake struck Davao Oriental on Saturday afternoon, Phivolcs said.
The tectonic quake, earlier reported to be a magnitude 6.3, struck at 3:16 p.m. and has a depth of 13 kilometers.
Its epicenter was located 26 km southeast of Manay town.
A building at the Ateneo de Davao University was damaged following the quake, while mall-goers in Davao City were instructed by authorities to evacuate.
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The quake struck off the coast of the southern town of Manay at about 3.16pm at a depth of 14km, the Philippine Institute of Volcanology and Seismology (Phivolcs) said in a statement. The institute said it expects the earthquake to have caused some damage but it and the local civil defence office said there were no immediate reports of serious destruction.
“A lot of people ran from their homes because a lot of items were falling inside,” Phivolcs science researcher John Deximo told AFP.
Power outages were also reported in the town of Baganga and the city of Mati.
The Philippines lies on the so-called Ring of Fire, a vast Pacific Ocean region where many earthquakes and volcanic eruptions occur. At least two people were killed and scores injured when a 6.5-magnitude quake struck the central Philippines in July 2017.
The most recent major quake to hit the Philippines was in 2013 when a 7.1-magnitude quake left more than 220 people dead and destroyed historic churches in the central islands.