The seismic activity is not projected to trigger a tsunami threat for the region, according to the Philippine Institute of Volcanology and Seismology (Phivolcs).
The Philippine-based group initially logged the earthquake as 6.5 on the Richter scale, with an epicenter depth of 66 kilometres.
Serious structural damage is unlikely, according to the national institution. However, aftershocks and associated damage reports are expected in the surrounding area.
Phivolcs noted that "moderate" shaking, whether indoors or outdoors, was registered in the Davao Oriental municipalities of Baganga and Caraga, as well as Maco, Davao de Oro.
Such tremors are classified as "Intensity IV", the Philippine-based group detailed. Comparatively, weak, or "Intensity III", shaking was detected in Bislig City, the most populous city/municipality in Surigao del Sur.
The Saturday morning earthquake came less than six hours after a 5.4-magnitude quake with a depth of 119 kilometres rocked the Davao Oriental municipality and waters off the coast of Davao Occidental.