A magnitude 7.2 earthquake struck Tuesday below waters off Sulu province's Tongkil municipality.
Philippine Institute of Volcanology and Seismology (Phivolcs) said the 2:13 p.m. offshore earthquake was of tectonic origin and struck 223 kms south 23 east of Tongkil at a depth of 625 kms.
Phivolcs is expecting further aftershocks from the earthquake after recording the first one just minutes following the main shock.
According to Phivolcs science research analyst Julius Galdiano, the earthquake's first aftershock was a magnitude 4.9 tremblor that occurred at 2:25 p.m. Tuesday.
He noted Phivolcs isn't expecting damages from the earthquake due to its depth and occurrence at sea.
The earthquake was reported at intensity II in General Santos City.
Phivolcs' earthquake intensity scale shows that means several people at rest indoors "slightly felt" the earthquake.
Slight swinging of hanging objects and noticeable oscillation of still water in containers are also observed in intensity II areas, noted Phivolcs.
Phivolcs will update its information on the earthquake as soon as data on the matter becomes available.
Source: Philippines News Agency