Two mild earthquakes struck southern Philippines early Tuesday but there were no reported damages, according to the U. S. Geological Survey. The 5.2 magnitude quake with a depth of 113 kilometers and epicenter 210 km southeast of this city was recorded 8:39 a.m. Around 4 a.m., a 5.2-tremor hit the region, with a depth of 69. 7 km and epicenter at 60 miles ESE of this city. The two incidents were felt in the cities of General Santos and Manila. There were no reported casualties or damages. The Philippines sits on the so-called Pacific 'ring of fire' where continental plates collide causing frequent seismic and volcanic activity. 