A MAGNITUDE 6.6 earthquake rattled Balut Island in Davao Occidental, the Philippine Institute of Volcanology and Seismology (Phivolcs) said.
According to Phivolcs, the tremor was tectonic origin.
It was traced 434 kms. east of Balut Island in the municipality of Sarangani.
The quake occurred at 9:39 a.m. It had a depth of 122 km.
Phivolcs said aftershocks may occur but will not cause damage.