The magnitude 7.8 earthquake that struck Southern and Central Mindanao on June 8 originated from the Cotabato Trench, one of six active underwater trenches surrounding the Philippines, all of which are capable of generating earthquakes of magnitude 8 and above, the director of the Philippine Institute of Volcanology and Seismology (PHIVOLCS) explained Saturday. PHIVOLCS Director Teresito Bacolcol gave the explanation in an…
