The Philippine Institute of Volcanology and Seismology (Phivolcs) said that the several provinces in Mindanao were jolted by three strong earthquakes on Monday early morning.

A magnitude of 4.3 struck at 4:37 a.m., Monday, 5 kilometers away at southeast of Columbio, Sultan Kudarat.

According to Phivolcs, the earthquake had a depth of 8 kilometers and was felt at Intensity III in Magsaysay, Davao del Sur, Instrumental Intensity III in Kidapawan City and Intensity I in Malungon, Sarangani and Koronadal City in South Cotabato.

On Monday, at the northeast of Malapatan, Sarangani, a magnitude 4.2 quake has also struck some 22 kilometers at 2:37 a.m., Phivolcs said.

The quake had a depth of 32 kilometers and was at the Instrumental Intensities III in Malungon, Sarangani and at Intensity II in Alabel and Kiamba towns of Sarangani and in General Santos City.

On Sunday, at 9:34 p.m., a magnitude 5.2 earthquake had also jolted Davao Occidental.

The quake was traced 168 kilometers southeast of Sarangani town that had a depth of 132 kilometers and was felt at Instrumental Intensities II and Intesity I in Malungon, Alabel and Kiamba in Sarangani and in Koronadal City and Tupi, South Cotabato, respectively.

According to Phivolcs, all the quakes were tectonic. However, there is no damage to infrastructure was reported so far.

Tectonics is the process that controls the structure and properties of the Earth’s crust and its evolution through time.

Also, aftershocks can be expected in Davao Occidental.

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