The U.S. Geological Survey said that the earthquake struck at 11:49 p.m. local time (15:49:41 UTC) about 21 miles west south-west of Sarangani, at a depth of about 42.2 miles.
So far, the USGS has received only a handful of felt reports, with residents near Sarangani describing the shaking as light to weak.
The relatively limited reports are likely due, in part, to the earthquake's significant depth, which can reduce the intensity of shaking at the surface near the epicenter.
The earthquake struck in the Pacific Ring of Fire, a region known for frequent seismic activity. It follows Monday's magnitude 6.3 earthquake west of the Loyalty Islands.
Comment: There have been 5 earthquakes of at least magnitude 6 along the Pacific Ring of Fire in the last 11 days, details of the other 4: