By Aaron Recuenco
Published Jun 8, 2026 09:23 am
At least four more earthquakes jolted Sarangani shortly after a 7.8 magnitude quake hit the coast of the province on Monday morning, the Philippine Institute of Volcanology and Seismology (Phivolcs).
The epicenter of the strong tremor that shook the province at 7:37 a.m. was located near Maasim town and triggered a tsunami warning for residents in the coastal areas of western and central parts of Mindanao.
The second quake, which is believed to be an aftershock, was felt at 8:18 a.m. with a magnitude of 3.7, the epicenter located near Balut Island of Saragani.
At 8:35 a.m., a 1.9 magnitude quake struck anew and its epicenter was located in Malapatan of the same province. Intensity II was felt in General Santos City and Intensity 1 in Kiamba town.
A few minutes later or at 8:44 a.m., another tremor measuring 2.5 in the Richter scale was recorded in Gian town, also in Sarangani. This was followed by another quake measuring 1.9 magnitude, with the epicenter located near the same town of the province.
Reported intensities
Shortly after releasing a report of the earthquake, Phivolcs reported an updated advisory on the reported intensities felt during the 7.8 magnitude quake that hit Sarangani.
Reported intensities refers to the measures of the specific strength and effects of an earthquake at a particular geographic location.
It is based on human observations and structural damage rather than the total energy released at its source
According to Phivolcs, the strongest ground shake was felt in General Santos City with Intensity VII followed by Palimbang and Senator Ninyo Aquino towns in Sultan Kudarat with Intensity VI.
Intensity V was felt in Davao City; Kidapawan City and Carmen town of Cotabato; Bagumbayan, Kalamansig and President Quirino in Sultan Kudarat; and Sibuco, and Siocon in Zamboanga del Norte.
Intensity IV, on the other hand, was felt in Mati City in Davao Oriental; Buug in Zamboanga Sibugay; and Caraga, Manay and Tarragano in Davao Oriental; Kumalarang and Vincenzo Sagun in Zamboanga del Sur, felt Intensity III tremor.
Intensity II 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.
Intensity II was also felt in Abuyog, and Dulag in Leyte and San Francisco in Southern Leyte.
Instrumental intensities
Instrumental intensity refers to the measured physical strength of an earthquake at a specific location. It is calculated objectively using data from scientific instruments like seismometers or accelerometers.
And according to Phivolcs, Intensity VIII was felt in Malapatan, Sarangani and Intensity VII in Koronadal City and Santa Maria in Davao Occidental.
Intensity VI was felt in General Santos City and T'boli, South Cotabato.
Intensity V in Maasim,Sarangani; Santo Niño, and Surallah, South Cotabato; Isulan,
Lebak, and President Quirino in Sultan Kudarat; Davao City; Digos City and Magsaysay in Davao del Sur.
Intensity IV in Kiamba, 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 in Tantangan, South Cotabato; Columbio, Esperanza, Sultan Kudarat; Alamada, Banisilan, Carmen, President Roxas in Cotabato; Kalilangan in Bukidnon; City of Gingoog in Misamis Oriental.
Intensity II in Kumalarang, Zamboanga del Sur; Tubod in Lanao del Norte; City of Malaybalay, and Libona in Bukidnon; Molave, Zamboanga del Sur; Cagayan de Oro City; Sindangan in Zamboanga del Norte; and, Balingasag in Misamis Oriental.
Intensity I in Malitbog Bukidnon and Magsaysay in Misamis Oriental.
