The quake was centred 61 km south-west ofDavao, at a depth of 28.2km, the US Geological Survey said, revising down themagnitude from an earlier 6.9.
Roads and buildings, including the local government office, were damagedand power was out in the Magsaysay Town in Davao del Sur province, near the epicenter.
No tsunamiwarning has been issued.
The area wasstruck by four strong earthquakes in the past two months, causing the death of atleast 20 people.
According to presidential spokesman Salvador Panelo, President Rodrigo Duterte was in Davao city when the quake struck, but heand his family members were unhurt./.