The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported two earthquakes rattled waters off Balut Island in Sarangani, Davao Occidental late Friday night.

The first and stronger tremor, a magnitude 6.8 tectonic earthquake, struck at 10:58 p.m. Its epicenter was located roughly 315 kilometers south 40 degrees east of Balut Island, at a shallow depth of 10 kilometers.

Instrumental readings showed Intensity II in Malungon and Kiamba in Sarangani; Koronadal City and Tupi in South Cotabato; and Palimbang in Sultan Kudarat.

Weaker tremors (Intensity I) were felt in Magsaysay in Davao del Sur; Sta. Maria in Davao Occidental; Nabunturan in Davao de Oro; Maitum and Malapatan in Sarangani; Banga, Tampakan, T’Boli, Surallah, and Santo Niño in South Cotabato; and General Santos City.

Shortly after, at 11:15 p.m., a smaller magnitude 5.2 earthquake occurred nearby, with its epicenter about 350 kilometers south 38 degrees east of Balut Island, also at a depth of 10 kilometers.

PHIVOLCS said neither quake is expected to cause damage, and no aftershocks are anticipated.