An aftershock measuring 4.6 on the Richter scale hit the southern Philippines Monday morning, hours after a strong quake hit the same area, the United States Geological Survey reported, according to Xinhua.
The aftershock was recorded 05:22 a.m. local time (2122 GMT Sunday), located 190 kilometers east-southeast of General Santos, Mindanao or 1,185 kilometers south-southeast of Manila, at an depth of 35.8 kilometers. No casualties or damages have been reported in the Southeast Asian country.
On Sunday afternoon, a 6.3-magnitude earthquake struck the same area, at an depth of 75.8 kilometers.
The Philippine archipelago lies on the so-called Pacific Ring of Fire, a string of islands on the Pacific Ocean rim that were formed by the eruptions of undersea volcanoes. It is regularly hit by earthquakes, and most of them are low in magnitude and cause little damage.