7.6 Quake Strikes Off Philippines Tsunami warning issued By Kate Seamons, Newser Staff Posted Aug 31, 2012 8:18 AM CDT Updated Aug 31, 2012 9:13 AM CDT 1 comment Comments 'An earthquake of this size has the potential to generate a destructive tsunami,' says the Pacific Tsunami Warning Center. (AP Photo) (Newser) – A tsunami warning has been issued for segments of Indonesia and the Philippines, after a powerful earthquake struck off the latter country, reports CNN. The Philippine Institute of Volcanology and Seismology is urging residents near the coast to seek higher ground in the wake of the 7.6-magnitude quake, Reuters reports. The US Geological Survey says the quake was 20 miles deep. The quake was initially pegged as a 7.9, and came with a broader tsunami warning that included Japan, Taiwan, and the Pacific Islands. Most of those warnings have now been lifted, though Japan's Meteorological Agency has issued a tsunami advisory for several coastal areas, predicting a 1.6-foot-high wave. The Pacific Tsunami Warning Center has likewise said that Hawaii "could experience non-destructive sea level changes."