MANILA (2nd UPDATE) - Several earthquakes struck off the province of Davao Occidental Wednesday night, the Philippine Institute of Volcanology and Seismology (Phivolcs) said.

A magnitude-5.0 tremor first hit at 8:45 p.m., with its epicenter recorded 96 kilometers southeast of Sarangani town.

It was first recorded at magnitude-5.6, with the epicenter at Jose Abad Santos town.

It was tectonic in origin and struck at a depth of 73 kilometers, according to Phivolcs.

Intensity III was recorded in Glan, Sarangani, while Intensity II was recorded in General Santos City, Davao City, and in Malapatan and Alabel towns in Sarangani province.

Instrumental intensities were also recorded in the following areas:

• Intensity IV - Malungon, Sarangani
• Intensity III -Alabel, Sarangani
• Intensity II - Kiamba, Sarangani; General Santos City; Tupi, South Cotabato

Five other earthquakes, with magnitudes ranging from 2.0 to 3.4, also struck Sarangani town within the next hour.

Phivolcs said 4 of the 5 quakes are aftershocks of the magnitude-5.0 offshore tremor.

Another magnitude 4.3 earthquake happened an hour later at 9:56 p.m., with the epicenter recorded 7 kilometers southeast of Malita town.

It was tectonic in origin and struck at a depth of 174 kilometers, according to Phivolcs.

Intensity III was recorded in General Santos City, with instrumental intensities recorded in the following areas:

• Intensity III - General Santos City; Malungon, Sarangani
• Intensity II - Alabel, Sarangani
• Intensity I - Tupi, South Cotabato

Phivolcs said the magnitude-4.3 earthquake is not expected to spawn aftershocks.

No damage has been reported so far due to the tremors.