The Quick Response Team of the Philippine Institute of Volcanology and Seismology (PHIVOLCS-DOST) has identified the fault that generated the deadline magnitude 6.9 earthquake in northern Cebu on September 30, 2025. 

In a post on its Facebook page, DOST-PHIVOLCS said the team found the onland extension of the newly-named Bogo Bay Fault in Sitio Looc, Barangay Nailon in Bogo City, the local government unit most affected by the quake. 

"The team observed fault scarps, open cracks, and small pressure mounds within a 2-meter-wide deformation zone," the agency said.

"Initial field mapping recorded about 200 meters of surface rupture, while drone surveys revealed the fault may extend up to 1.5 kilometers, showing signs of right-lateral movement. Field verification is ongoing to determine the full extent of the rupture," it said further.

DOST-PHIVOLCS reminded the public "to stay prepared for strong aftershocks, secure their homes, know evacuation routes, and rely only on official sources for updates and safety instructions. Stay safe and stay informed."

As of 12 noon on October 3, 2025, at least 4,161 aftershocks have been recorded. 

The earthquake killed at least 73 people and injured at least 297. It has affected 47,221 families (170,959 individuals) with many needing food and shelter.