The Philippine national disaster agency had so far received no reports of casualties, injuries or major damage, administrator Ricardo Jalad said. 

"Looks like nothing scary happened, like a collapse of a building," Jalad told reporters. 

Airports, sea ports and key infrastructure were for the most part unaffected by the quake, while all personnel were accounted for, the transport ministry said. 

A seldom-used airport in southern Davao Oriental province had minor cracks on the runway, but there was no damage to the passenger terminal building, it said.