Manila, June 24 (Reporter) An earthquake with a preliminary magnitude of 6.4 hit waters off southeastern Philippines on Tuesday morning, the Philippine Institute of Volcanology and Seismology said. The institute said the quake, which occurred at 09:58 a.m. local time (0158 GMT), hit at a depth of 10 km, about 359 km northeast of Baganga town in Davao Oriental province. The institute said the tectonic quake will not cause damage. The archipelagic Philippines has frequent seismic activities due to its location along the Pacific "Ring of Fire...////...