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Manila Bulletin devider Philippines devider National devider Phivolcs issues tsunami warning after 7.8-magnitude quake strikes off Sarangani

Phivolcs issues tsunami warning after 7.8-magnitude quake strikes off Sarangani

Published Jun 8, 2026 08:15 am

At A Glance

  • The first tsunami waves are expected to arrive between 7:37 a.m. and 9:37 a.m.
  • The warning covers the provinces of Sarangani, Davao Occidental, Tawi-Tawi, Sulu, Basilan, Zamboanga del Sur, Zamboanga Sibugay, Sultan Kudarat, and South Cotabato.
Philippine Institute of Volcanology and Seismology (Phivolcs)
Philippine Institute of Volcanology and Seismology (Phivolcs)
A magnitude 7.8 earthquake struck off the coast of Sarangani at 7:37 a.m. on Monday, June 8, prompting the Philippine Institute of Volcanology and Seismology (Phivolcs) to issue a tsunami warning for several coastal provinces in Mindanao.
According to Phivolcs, tsunami waves exceeding one meter above normal tide levels are expected based on the agency's local tsunami scenario database.
The agency warned that higher wave heights may occur in enclosed bays, straits, and other coastal areas where tsunami effects can be amplified.
The first tsunami waves are expected to arrive between 7:37 a.m. and 9:37 a.m.
The warning covers the provinces of Sarangani, Davao Occidental, Tawi-Tawi, Sulu, Basilan, Zamboanga del Sur, Zamboanga Sibugay, Sultan Kudarat, and South Cotabato.
Phivolcs said tsunami activity may continue for several hours after the arrival of the initial waves.
Residents of coastal communities in the affected areas were urged to immediately evacuate to higher ground or move farther inland.
The agency also advised owners of boats in harbors, estuaries, and shallow coastal waters within the warning areas to secure their vessels and stay away from the shoreline.
Boats already at sea were advised to remain offshore in deep waters until authorities issue further instructions.
Phivolcs said local government units, disaster risk reduction and management offices, and other concerned authorities should take appropriate action and continue monitoring official advisories.
Phivolcs upgrades Sarangani earthquake to magnitude 7.8
In Earthquake Information No. 2, Phivolcs upgraded the magnitude of the destructive earthquake that struck off Sarangani province from an earlier reported magnitude of 7.0 to 7.8.
Phivolcs said the earthquake, which was located 32 kilometers southwest of Maasim, Sarangani, was caused by movement along the Cotabato Trench.
Intensity VI shaking (very strong) was felt in Palimbang and Senator Ninoy Aquino in Sultan Kudarat, while Intensity V (strong) was felt in Davao City, Kidapawan City, Carmen in Cotabato, Bagumbayan, Kalamansig and President Quirino in Sultan Kudarat, and Sibuco and Siocon in Zamboanga del Norte.
Intensity IV (moderately strong) was reported in Mati City, Davao Oriental; Buug, Zamboanga Sibugay; and Caraga, Manay and Tarragona in Davao Oriental.
Intensity III (weak) was felt in Butuan City; Mainit, Surigao del Norte; Dapitan City, Zamboanga del Norte; and Kumalarang and Vincenzo Sagun in Zamboanga del Sur.
Intensity II (slightly felt) was recorded in Dipolog City, Labason, Liloy, President Manuel A. Roxas and Salug in Zamboanga del Norte; Alicia, Ipil, Mabuhay, Olutanga and Siay in Zamboanga Sibugay; Molave in Zamboanga del Sur; Abuyog and Dulag in Leyte; and San Francisco in Southern Leyte.
Based on instrumental measurements recorded by seismic sensors, the strongest ground shaking was Intensity VIII (very destructive) in Malapatan, Sarangani.
Intensity VII (destructive) was also recorded in Koronadal City, South Cotabato, and Santa Maria, Davao Occidental.
Intensity VI was measured in General Santos City and T'boli, South Cotabato.
Intensity V was recorded in Maasim, Sarangani; Santo Niño and Surallah in South Cotabato; Isulan, Lebak and President Quirino in Sultan Kudarat; Davao City; and Digos City and Magsaysay in Davao del Sur.
Intensity IV was measured in Kiamba and Malungon in Sarangani; Banga and Tupi in South Cotabato; Magpet and M'lang in Cotabato; Bagumbayan and Kalamansig in Sultan Kudarat; Nabunturan in Davao de Oro; and Zamboanga City.
Intensity III was recorded in Tantangan, South Cotabato; Columbio and Esperanza in Sultan Kudarat; Alamada, Banisilan, Carmen and President Roxas in Cotabato; Kalilangan in Bukidnon; and Gingoog City in Misamis Oriental.
Intensity II was measured in Kumalarang and Molave in Zamboanga del Sur; Tubod in Lanao del Norte; Malaybalay City and Libona in Bukidnon; Cagayan de Oro City; Sindangan in Zamboanga del Norte; and Balingasag in Misamis Oriental.
Intensity I (scarcely perceptible) was recorded in Malitbog, Bukidnon, and Magsaysay, Misamis Oriental.
Phivolcs warned of aftershocks due to this destructive earthquake.

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PHIVOLCS TSUNAMI MINDANAO SARANGANI EARTHQUAKE 7.8-MAGNITUDE
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