The Mindanao Fault, which has been restive the past few months, could generate a magnitude-8 earthquake, an official of the Philippine Institute of Volcanology and Seismology in North Cotabato said.

Hermis Daquipa, Phivolcs North Cotabato director, issued the statement Friday in the wake of observations that tremors have become more frequent since November.

On Friday, another earthquake jolted some parts of Mindanao less than 72 hours after a quake struck off Sultan Kudarat province Tuesday.

The second quake, which was traced some 32 kilometers southeast of Tagum City, shook the areas of Davao City, General Santos City and several towns in Davao del Sur and North Cotabato.

Eleazar Jorgio, Phivolcs science researcher in Southern Mindanao, said the 8:02 a.m. jolt had a magnitude of 5.3.

No injuries or damage was reported from either quake.