A magnitude-7.8 earthquake hit off Sarangani early on June 8, destroying buildings, disrupting utility services across parts of Mindanao, and forcing the suspension of classes and government work, Inquirer reports. The tectonic tremor struck at 7:37 am at a depth of 33 km, with its epicentre located 32 km south of Maasim.

The disaster highlights the extreme vulnerability of the southern Philippines to the Pacific Ring of Fire – where high-magnitude underwater quakes pose a dual threat of severe localized destruction and wider regional tsunami risks that can disrupt multiple Southeast Asian nations simultaneously. The timing is particularly damaging, paralysing the region on the official opening day of the school year.

According to Aljazeera, footage on official social media channels showed a three-storey building housing a Jollibee restaurant collapsing in a cloud of debris in General Santos City. Other structures suffered smashed windows and caved-in roofs. The initial shock lasted roughly 30 seconds in Koronadal City, severing internet, electricity, and water networks. A magnitude aftershock followed shortly after at 7:49 am.

The Philippine Institute of Volcanology and Seismology (PHIVOLCS) registered the highest shaking at Instrumental Intensity VIII in Malapatan, Sarangani. General Santos City experienced Intensity VII, whilst Intensity VI hit Palimbang and Senator Ninoy Aquino. Intensity V shaking reached Davao City, Kidapawan City, Carmen, Bagumbayan, Kalamansig, President Quirino, Sibuco, and Siocon. Instrumental Intensity VII was also recorded in Koronadal City and Santa Maria.

The threat extended to regional waters. The Pacific Tsunami Warning Centre warned that coastal areas in the Philippines could face waves reaching up to 3 metres. Ocean swells of up to 1 metre were deemed possible along shorelines in Malaysia and Indonesia, prompting coastal safety alerts across the Philippines, Indonesia, and Japan.

President Ferdinand Marcos activated national crisis institutions, including the Office of Civil Defence and the National Disaster Risk Reduction and Management Council, on June 8. The premier urged immediate coastal evacuations to higher ground. Concurrently, Phivolcs instructed maritime operators to secure vessels away from the waterfront or remain in deep water offshore. No casualties have been confirmed whilst the evaluation of the disaster zone continues.