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PHIVOLCS: Surigao quake triggered by Philippine Trench, unrelated to Davao tremors
The Philippine Institute of Volcanology and Seismology (PHIVOLCS) identified the Philippine Trench as the source of the magnitude 6.0 earthquake that struck General Luna, Surigao del Norte.
PHIVOLCS clarified that this earthquake is not related to the magnitude 7.4 and 6.8 doublet earthquakes that occurred in Davao Oriental last week, despite both being generated by the Philippine Trench.
The separation is attributed to the significant length of the trench, with the earthquakes occurring in different segments.
The Philippine Trench is a deep oceanic subduction zone located off the eastern coast of the Philippines, extending over 1,300 kilometers.
PHIVOLCS chief Dr. Teresito Bacolcol noted that trenches are capable of producing earthquakes exceeding magnitude 8.
Recent tremors are not expected to trigger Metro Manila's 'Big One,' which is anticipated to originate from the West Valley Fault.
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A magnitude 6.0 earthquake, tectonic in origin, struck Surigao del Norte at 7:03 a.m. on Friday, October 17, 2025, with its epicenter 13 kilometers southeast of General Luna.
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A magnitude 6.2 earthquake struck near Cagwait, Surigao del Sur on October 11, 2025, at 10:32 p.m., with its epicenter located 22 kilometers northeast of Cagwait at a depth of 10 kilometers.
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