MANILA, Philippines — A magnitude 6.4 earthquake struck the waters off Mindanao on Tuesday morning, according to the Philippine Institute of Volcanology and Seismology (Phivolcs). Phivolcs reported that the tremor struck at 9:58 a.m., with the epicenter located 359 kilometers east of Baganga, Davao Oriental. The earthquake was tectonic in origin and had a depth