The quake struck at 7:42 p.m. at a depth of 52.4 kilometers in the waters about 35 kilometers southwest of Mindanao island's Jose Abad Santos town, according to the United States Geological Survey, which revised the magnitude from an initial 6.7. No tsunami alert was issued.
Santa Maria town rescue official Jerson Talahig told AFP there were no immediate reports of casualties or damage.
"It was kind of strong, but it was quick. We saw the table and some of the lights shaking," he said.
The 7.8-magnitude tremor that hit Mindanao on June 8 brought down buildings, triggered landslides and displaced thousands on the southern island, while also setting off tsunami warnings across the region.
The powerful quake forced the seabed upwards by two meters on a long stretch of the coast, pushing previously submerged coral above the water and extending the shoreline by as much as 200 meters in a geological phenomenon known as "coastal uplift."
