|Source: Daily Mail|
Renato Solidum of the Philippine Institute of Volcanology and Seismology says the quake, which was set off by movement of oceanic plates 387 miles under the seabed, was slightly felt in southern General Santos city.
Solidum says the undersea quake was centered 138 miles southeast of Sulu province and aftershocks were still possible.
The Philippine archipelago lies in the Pacific 'Ring of Fire,' where earthquakes and volcanic activities are common.
A magnitude 7.7 quake killed nearly 2,000 people on the northern island of Luzon in 1990.
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