The first quake of magnitude 7.4, in waters off the town of Manay in the province of Davao Oriental, triggered a tsunami alert for coasts within 300 km (186 miles) of the epicentre, but the warnings for the Philippines and Indonesia were subsequently lifted.

A second earthquake of magnitude 6.8 struck the same area seven hours later, triggering a new tsunami warning, with the country's seismology agency Phivolcs warning of possible waves that could be more than one metre (3.2 feet) higher than normal tides.

People living near coastal areas in the southern Philippines were "strongly advised to immediately evacuate" to higher ground, or move further inland, it said in an advisory.