Mindanao: The Department of Environment and Natural Resources (DENR) has issued a warning against constructing infrastructure, including residential buildings, on newly formed coastal uplift areas in Mindanao following the magnitude 7.8 earthquake on June 8.

According to Philippines News Agency, DENR-Mines and Geosciences Bureau (MGB) Assistant Secretary Karlo Quea±o explained in a Radyo Pilipinas interview that it is dangerous to inhabit coastal uplift areas. He cited a similar incident in Bohol in 2013 following a magnitude 7.2 earthquake. Quea±o emphasized the risk, stating that despite the uplift, the sea could return, and highlighted the need to treat these areas as geologic monuments rather than development sites.

Quea±o pointed out that these areas are susceptible to geological and climate-related hazards. The coastal uplift in parts of Davao Occidental and nearby regions is a natural result of the tectonic movement triggered by the earthquake. He explained that coastal uplifts are manifestations of deformation caused by the seismic event.

Residents have reported that parts of the shoreline have risen, exposing previously submerged areas such as corals, seabed, and seagrass. This phenomenon has sparked public interest in whether these newly emerged lands can be developed for habitation. Quea±o noted that scientists are still examining the extent of these changes, emphasizing the necessity of caution due to rising sea levels in the Philippines.

He added that while some coral formations, which may eventually become limestones, have been exposed, their long-term stability is uncertain. Quea±o also warned that the earthquake's effects extend beyond coastal communities. Ground movement and earthquake-induced landslides can alter waterways, potentially creating new flood risks.

He explained that if a river that previously flowed to the sea is affected by coastal uplift, it might change its path, possibly impacting nearby communities. Changes in the coastal area can also affect upstream regions, and landslides caused by strong earthquakes can block rivers, forming temporary natural dams that might eventually collapse, leading to flash floods.

The MGB is collaborating with the Office of Civil Defense (OCD) and local governments to monitor affected areas and provide hazard assessments.