Indonesia, June 8 -- The Meteorology, Climatology, and Geophysics Agency (BMKG) reported that a magnitude 7.7 tectonic earthquake on the southern coast of Mindanao, Philippines, on Monday morning at 6:37 a.m. was caused by plate subduction activity.

"Considering the location of the epicenter and the depth of the hypocenter, this was a shallow earthquake caused by plate subduction activity," Wijayanto, BMKG's Director of Earthquakes and Tsunamis, said in a statement on Monday.

Analysis of the source mechanism indicated that the earthquake involved a thrust fault.

The earthquake was felt in Morotai City, North Halmahera, at an intensity of IV on the Modified Mercalli Intensity (MMI) scale, which is felt by many people indoors during the ...