A powerful 6.8 magnitude undersea earthquake rocked the Philippines on Friday, Nov. 17, officials said. The quake occurred in the southern Mindanao region at 4:14 p.m. local time. Although initially logged as having a magnitude of 7.2, the Philippine Institute of Volcanology and Seismology (PHIVOLCS) later downgraded the earthquake to 6.8m, local news reported. There is currently no tsunami warning in effect.