Epicenter of the magnitude 6.4 earthquake. Intensity IV was felt in General Santos City; the Sarangani towns of Kiamba, Malungon, and Alabel; and the South Cotabato municipalities of Tupi and Polomolok. In a separate tsunami information bulletin, PHIVOLCS said no destructive tsunami threat exists based on available data. The agency said the earthquake poses no tsunami threat to the Philippines and that no action is required. Following the earthquake, the General Santos City government issued Executive Order No.