Two moderate earthquakes struck off Mamburao on Tuesday, the US Geological Survey said, the Philippine Institute of Volcanology and Seismology said.

The latest tectonic quake, measuring magnitude 3, hit at around 3:59 a.m., about 21 kilometers southeast of Mamburao.

The first tremor, 2.9 magnitude, struck at 1:21 a.m. 24 kilometers southeast of the capital of Occidental Mindoro.

There were no reported injuries from the twin quakes that both occurred at a shallow depth of 15 kilometers.

In Mindanao, a 4.6 magnitude quake hit at 9:13 p.m. about 80 kilometers southeast of General Santos City.

The Philippines sits on the Pacific “Ring of Fire” where continental plates collide causing frequent seismic and volcanic activity.