The tremors occurred at 11:52 a.m. and 12:43 p.m. with their epicenter located 85 kilometers southwest of Cotabato City, the Philippine Institute of Volcanology and Seismology (Phivolcs) said.
Phivolcs director Renato Solidum said the first quake with a magnitude of 4.8 was felt at Intensity 2 in Davao City and Intensity 1 in General Santos City, and the second, with 5.2 magnitude, was felt at Intensity 3 in Davao City.
A movement of the Philippine fault caused the tremors, Phivolcs said, adding that there were no recorded aftershocks.
On Tuesday, a 4.4 magnitude quake shook Metro Manila and nearby provinces.
The country sits on the so-called "Pacific Ring of Fire" where continental plates meet, causing frequent seismic and volcanic activity.
Some 20 quakes hit the country every day but only few are felt, Phivolcs said. — Helen Flores