Powerful 7.8 Magnitude Quake Kills Eight, Triggers Tsunami Alerts Across Mindanao

A powerful 7.8 magnitude earthquake struck off the coast of Sarangani in Mindanao on June 8, causing building collapses and widespread damage across parts of Mindanao, with preliminary reports of deaths ranging from at least three to eight as authorities continue verifying casualties. In response, Philippine agencies mobilized rescue and relief efforts, suspended or disrupted transportation and government services, including halting operations at General Santos Airport and postponing classes while infrastructure inspections were carried out. The quake also triggered tsunami warnings and coastal evacuation alerts across areas in the Philippines and parts of the Pacific, with tsunami waves recorded in Sarangani and nearby communities, before monitoring continued and aftershocks were expected. Separately, Malaysia’s meteorological agency reported a subsequent 5.3 magnitude quake in Mindanao with no tsunami threat to Malaysia after earlier alerts from a stronger morning earthquake were lifted. Regional governments also moved quickly to assess schools and key infrastructure, such as temporarily suspending learning activities and closing a bridge for inspection.
Philippine authorities began breaking down confirmed deaths by location: the Office of Civil Defense reported at least eight fatalities distributed across “three in Davao Occidental, three in General Santos City, and two in South Cotabato.”
PHIVOLCS said the quake occurred at 7:37 a.m., “about 32 kilometers southwest of Maasim, Sarangani,” at a depth of “33 kilometers,” and it recorded the strongest shaking at Intensity VII in General Santos City.
Tsunami monitoring included specific wave measurements and a broad regional alert: the highest recorded tsunami wave reached “1.4 meters above normal tide levels,” after warnings were issued for coastal areas including “Palau, Taiwan, and Papua New Guinea.”
MetMalaysia detailed the follow-on quake used to reassure Malaysia: the 5.3 event was at a depth of “70 kilometres,” about “155km north-west of the Talaud Islands, Indonesia,” and it said Malaysia received no tsunami threat.
Local government actions were concrete and time-bound. In Butuan, all education levels were temporarily suspended while an infrastructure audit team checked school buildings; in Surigao del Sur, the LGU Tago “temporarily closed the Gamut Bridge for 24 hours” for inspection by the Department of Public Works and Highways.
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