Members of the Geomorphology and Active Tectonics (GEAR) Laboratory carried out field activities in Northern Cebu from March 5 to 10, 2026. Upon invitation by the Philippine Institute of Volcanology and Seismology (PHIVOLCS), Dr. Noelynna T. Ramos was accompanied by Ms. Angela Nicole S. Masongsong in visiting sites affected by the 2025 Mw 6.9 Northern Cebu Earthquake.
The fieldwork initially focused on reported uplifted marine terraces along the eastern coastline of Bogo City. Alongside the Coastal Assessment, Mapping, and Research of Tsunami Hazards in the Philippines (CoAsT PH) Project Team of PHIVOLCS, led by Ms. Robelyn Mangahas-Flores, geological sampling and observations were conducted to investigate evidence of potential coseismic uplift in the area.
Observed coastal uplift in Nailon, Bogo City (left), and a potential collapse structure along the coastline (right)
As part of the 2026 NIGS Grant-funded project, “Spatiotemporal Analysis of Sinkhole Clustering and Evolution in Bogo, Cebu”, sinkhole sites that appeared after the earthquake were also visited. Select sinkholes in Bogo City and the Municipality of San Remigio show a possible complex scenario for sinkhole formation and growth in observed sites within Northern Cebu.
Sinkhole observed in the Municipality of San Remigio at ground level (left) and at bird's-eye view imaged through drone (right)