The Philippines has been rocked by another huge earthquake only hours after two people died from an earlier tremmor.

The 6.9-magnitude tremmor came after a 7.9-magnitude earthquake which damaged schools and an international airport, forcing thousands to flee coastal towns amid tsunami warnings.

The 7.9-magnitude quake hit at 9.43am local time or 01.43am GMT about 43 kilometres east of Manay town in Davao Oriental province at a depth of 23 kilometres, according to the Philippine Institute of Volcanology and Seismology.