REGIONAL
Advocates Philippines
PHIVOLCS Confirms Bogo Bay Fault Extends On Land, Revealing Clues To The M6.9 Cebu Quake
Photo credit: PHIVOLCS-DOST
The mystery behind the Magnitude 6.9 Offshore Northern Cebu Earthquake from September 30, 2025, is starting to unravel.
The DOST-PHIVOLCS Quick Response Team (QRT) has successfully located the on-land extension of the newly-named Bogo Bay Fault in Sitio Looc, Barangay Nailon, Bogo City. This is a significant find, as it helps explain the force and location of the strong tremor.
During their initial fieldwork, the PHIVOLCS team observed clear signs of the earth moving right on the surface. Within a 2-meter-wide deformation zone, they recorded features such as fault scarps (small steps in the ground), open cracks, and small pressure mounds. Initial mapping on the ground measured a rupture of about 200 meters. However, drone surveys suggest the fault could stretch even further—possibly up to 1.5 kilometers—and shows clear signs of a right-lateral movement. Field verification is still underway to determine the complete length and extent of this newly-identified surface rupture.
As the scientific work continues, DOST-PHIVOLCS reminds everyone that the threat of strong aftershocks remains. The agency urges the public to stay prepared, secure their homes, know their evacuation routes, and rely only on official government sources for updates and safety instructions. Staying safe and informed remains the priority.
The DOST-PHIVOLCS Quick Response Team (QRT) has successfully located the on-land extension of the newly-named Bogo Bay Fault in Sitio Looc, Barangay Nailon, Bogo City. This is a significant find, as it helps explain the force and location of the strong tremor.
During their initial fieldwork, the PHIVOLCS team observed clear signs of the earth moving right on the surface. Within a 2-meter-wide deformation zone, they recorded features such as fault scarps (small steps in the ground), open cracks, and small pressure mounds. Initial mapping on the ground measured a rupture of about 200 meters. However, drone surveys suggest the fault could stretch even further—possibly up to 1.5 kilometers—and shows clear signs of a right-lateral movement. Field verification is still underway to determine the complete length and extent of this newly-identified surface rupture.
As the scientific work continues, DOST-PHIVOLCS reminds everyone that the threat of strong aftershocks remains. The agency urges the public to stay prepared, secure their homes, know their evacuation routes, and rely only on official government sources for updates and safety instructions. Staying safe and informed remains the priority.
Oct 3, 2025
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