MANILA, July 11 (Xinhua) -- An offshore earthquake with a preliminary magnitude of 6.5 struck Sultan Kudarat province in the southern Philippines on Thursday morning, the Philippine Institute of Volcanology and Seismology reported.
The institute said the quake, which occurred at 10:13 a.m. local time, hit at a depth of 651 kilometers, about 91 kilometers southwest of Kalamansig, a coastal town.
The tremor was also felt in Tagum City in Davao del Norte province.
The institute said the tectonic quake will trigger aftershocks but will not cause damage.
The archipelagic Philippines has frequent seismic activities due to its location along the Pacific "Ring of Fire." ■
