CCTV video from Phivolcs shows the effect of the 5.9-magnitude quake that his Sarangani province early Saturday.

MANILA (UPDATE) - A 5.9-magnitude earthquake struck Sarangani at 8:30 a.m. Saturday morning, rattling residents around the province and neighboring areas.

Earlier measured at magnitude 5.4, the Philippine Institute of Volcanology and Seismology (Phivolcs) modified its initial advisory to upgrade the earthquake’s scale.

The earthquake was tectonic in origin, with its epicenter located near Malapatan town, Phivolcs said. Residents said tremors were also felt in other areas in Sarangani, South Cotabato, and General Santos City.

As of this writing, the Malapatan Disaster Risk Reduction Office has not received any report of property damage or injuries.

Phivolcs said it expects aftershocks.

Nane Danlag, science research assistant at Phivolcs’ office in General Santos City, said locals close to the quake's epicenter felt an up-and-down movement during the quake.

Phivolcs measured the following intensities in affected areas:

Intensity V - Malapatan and Alabel, Sarangani; General Santos City
Intensity IV - Digos City; Kiamba, Sarangani
Intensity III - Davao City and Lebak, Sultan Kudarat

Instrumental Intensity:
Intensity V - General Santos City
Intensity I - Zamboanga City

-- with reports from Chai Tabunaway, ABS-CBN News