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| Landslides in the Philippines | |
|---|---|
| Name | Landslides in the Philippines |
| Date | Various |
| Location | Philippines |
| Type | Landslide |
| Fatalities | Varied |
| Damages | Varied |
Landslides in the Philippines are frequent geologic hazards driven by Philippine archipelago, steep Cordillera Central and Sierra Madre slopes, intense tropical cyclones, volcanic activity, and human land use. They produce local and regional disasters that affect Manila, Cebu City, Davao City, and rural provinces such as Benguet, Cagayan, Mindanao, and Leyte. Responses involve agencies and organizations including the Philippine Institute of Volcanology and Seismology, National Disaster Risk Reduction and Management Council, and international partners like the United Nations and Asian Development Bank.
Landslides in the Philippines occur as rockfalls, debris flows, rotational and translational slides on volcanic, metamorphic, and sedimentary terrains across Luzon, Visayas, and Mindanao. Triggering mechanisms include heavy precipitation from Typhoon Haiyan, Typhoon Ketsana, and other tropical cyclones tracked by PAGASA while susceptibility is mapped by institutions such as the Philippine Geographic Information System and academic centers at University of the Philippines, Ateneo de Manila University, and Mindanao State University.
Primary natural causes include prolonged or intense rainfall from systems like Typhoon Mangkhut and Typhoon Frank, seismic shaking from events recorded by the Philippine Fault Zone, and eruptive processes at volcanoes such as Mayon Volcano, Mount Pinatubo, and Taal Volcano. Geologic substrates such as the Caraballo Mountains and Zambales Mountains present steep gradients and weak lithologies. Human contributions involve deforestation in watersheds tied to companies and land tenure issues in provinces like Palawan and mining operations regulated under laws like the Mining Act of 1995. Infrastructure projects by agencies such as the Department of Public Works and Highways and urban expansion in metropolitan areas like Quezon City alter drainage and slope stability.
Notable deadly events include the 2006 landslide at Guinsaugon in Saint Bernard, Southern Leyte following Tropical Storm Reming that buried communities; the 2016 Mayon-adjacent slope failures affecting Albay; the 2009 sediment-laden floods and slope failures associated with Typhoon Ketsana in Metro Manila and surrounding provinces; and multiple slope failures after the 2013 Bohol earthquake impacting Bohol and nearby islands. Other significant incidents involved urban slope collapses in Marikina and road-cut failures on routes crossing the Mountain Province.
Landslides cause fatalities, displacement, damage to roads and bridges maintained by the Department of Public Works and Highways, loss of agricultural land in provinces like Ifugao, and disruption to ports such as Port of Cebu and airports including Ninoy Aquino International Airport. Economic losses affect sectors represented by the Department of Trade and Industry and local governments led by municipal mayors in affected municipalities. Environmental impacts include altered river courses within basins like the Cagayan River and sedimentation issues managed by the National Irrigation Administration. Social consequences implicate Philippine Red Cross relief operations and community rehabilitation programs supported by donor agencies such as the World Bank.
Risk assessment employs hazard zonation maps developed by agencies like the Geological Survey, universities, and the Mines and Geosciences Bureau. Monitoring integrates rainfall data from PAGASA, seismic records from the Philippine Seismological Network, and ground observations from local disaster risk reduction offices under the National Disaster Risk Reduction and Management Council. Early warning systems draw on technologies from partners such as the Japan International Cooperation Agency and use community-based approaches advocated by UNICEF and Oxfam. Remote sensing from satellites operated by agencies including Philippine Atmospheric, Geophysical and Astronomical Services Administration partners and international programs informs susceptibility mapping.
Mitigation measures include engineered slope stabilization by the Department of Public Works and Highways, reforestation projects in collaboration with the Department of Environment and Natural Resources, controlled land-use planning by municipal councils, and relocation programs administered with support from the National Housing Authority. Preparedness emphasizes community drills coordinated with Philippine National Police, evacuation centers managed by local barangays, and education campaigns by academic institutions such as University of the Philippines Diliman and NGOs like Haribon Foundation. Infrastructure design standards reference guidelines from multilateral lenders such as the Asian Development Bank and professional bodies like the Philippine Institute of Civil Engineers.
The policy and legal framework includes the Republic Act No. 10121 establishing the National Disaster Risk Reduction and Management Council, environmental statutes under the Department of Environment and Natural Resources, and mining regulation under the Philippine Mining Act. Local governments implement ordinances under the Local Government Code of 1991 while environmental impact assessments follow guidelines from the Environmental Management Bureau. International cooperation frameworks engage entities such as the United Nations Office for Disaster Risk Reduction and bilateral partnerships with the Japan International Cooperation Agency and United States Agency for International Development.
Category:Natural disasters in the Philippines Category:Geology of the Philippines