Footage shows a wall clock swinging as a 6.7 magnitude earthquake struck southern Philippines on Tuesday morning.

Philippine seismological agency PHIVOLCS said the quake struck southeast of Balut island in Sarangani town, Davao Occidental province at 4:48 am local time on January 9.

The tremor occurred 94 kilometres underground and did not trigger tsunami alerts. PHIVOLCS said aftershocks were expected, but infrastructure damage was unlikely.

In December, a 7.4 magnitude quake struck off Surigao del Sur province, also in the country's south, killing one pregnant woman.

The Philippines is an archipelago of more than 7,000 islands inside the Pacific 'Ring of Fire' where the majority of Earth's volcano eruptions and earthquakes happen.