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| Earthquakes in the Philippines | |
|---|---|
| Name | Earthquakes in the Philippines |
| Caption | Schematic of major faults and plate boundaries around the Philippines, including the Philippine Trench and Manila Trench |
| Location | Philippines |
| Date | Ongoing |
| Magnitude | Variable |
| Depth | Variable |
| Casualties | Variable |
Earthquakes in the Philippines occur frequently due to the archipelago's location at the complex convergence of the Philippine Sea Plate, the Eurasian Plate, and several microplates. Seismicity in the Luzon-Mindanao corridor is shaped by subduction zones such as the Philippine Trench and transform systems including the Philippine Fault Zone. Major earthquakes have affected cities like Manila, Cebu City, Davao, and Baguio, and have involved institutions such as the Philippine Institute of Volcanology and Seismology and international partners like the United States Geological Survey and Japan Meteorological Agency.
The archipelago sits at the junction of the Philippine Sea Plate and the Eurasian Plate with nearby microplates including the Sunda Plate and the Molucca Sea Collision Zone. Subduction along the Philippine Trench and the Manila Trench produces megathrust events that have generated tsunamis affecting the South China Sea and Celebes Sea. The strike-slip Philippine Fault Zone transects Luzon and links with the San Bernardino Strait structures and the Philippine Mobile Belt. Other significant structures include the Cotabato Fault System, the Central Philippine Fault, the Davao Oriental Fault, and the Marikina Valley Fault System near Metro Manila. Interactions with the Ryukyu Trench, the Sunda Arc, and back-arc basins like the Luzon Volcanic Arc connect seismicity to volcanic centers such as Mount Mayon, Taal Volcano, Mount Apo, and Mount Pinatubo.
Historic records from the Spanish colonial era through the American colonial period document events like the 1645 Manila earthquake and the 1863 Manila earthquake that damaged Intramuros and colonial structures. The 1918 Luzon earthquakes impacted infrastructure linked to Commonwealth of the Philippines development. Postwar seismicity includes the 1976 Tangshan-era global awareness (contextual), the 1990 Baguio earthquake which devastated facilities associated with the University of the Philippines campus and local industries, and the 2013 Bohol earthquake which affected heritage sites including Baclayon Church and religious orders connected to the Roman Catholic Church in the Philippines. Historic tsunami records reference trade routes to Manila Bay and impacts on ports like Cebu Port and Zamboanga City.
Prominent events encompass the 1645 Luzon earthquake that altered shorelines near Batangas, the 1863 Manila earthquake that damaged San Agustin Church in Intramuros, the 1918 Casiguran earthquake which affected Isabela and shipping lanes, the 1976 Philippine earthquake sequence in the Mindanao region near Cotabato and the 1990 Luzon earthquake (commonly the 1990 Luzon earthquake / Baguio earthquake) which impacted Baguio, La Union, and military installations of the Armed Forces of the Philippines. More recent significant shocks include the 2012 Visayas earthquake sequence, the 2013 Bohol earthquake, the 2019 Mindanao earthquakes near Tulunan, and the 2022 Abra earthquake that affected communities in Ilocos Region and infrastructure tied to agencies like the Department of Public Works and Highways. Each event involved responders such as the National Disaster Risk Reduction and Management Council and international relief from organizations like the International Red Cross and the United Nations Office for the Coordination of Humanitarian Affairs.
Seismic hazard maps produced by the Philippine Institute of Volcanology and Seismology and collaborations with the United States Agency for International Development and Japan International Cooperation Agency show elevated seismic hazard along the Philippine Fault Zone, the Manila Trench margin adjacent to Metro Manila, and the southern arcs near Mindanao. Urban exposure includes critical lifelines in Quezon City, Pasig, Cebu City, and Iloilo City with concentrations of populations in Metro Manila and the Calabarzon region. Heritage assets such as San Agustin Church, Miag-ao Church, and infrastructures like the Ninoy Aquino International Airport terminals are at risk. Economic sectors tied to ports such as Manila International Container Port and industries in Clark Freeport and Special Economic Zone and Subic Bay Freeport Zone face disruption. Tsunami risk to coastal towns along Leyte Gulf, Samar, and the Zambales coastline is linked to historic events and models used by agencies including the Pacific Tsunami Warning Center.
Mitigation measures include building-code enforcement under the National Building Code of the Philippines (PD 1096), retrofitting programs in partnership with the World Bank and Asian Development Bank, and community-level preparedness by organizations such as the Philippine Red Cross and local barangay disaster committees. Public education campaigns involve institutions like the Department of Education, the Office of Civil Defense, and nongovernmental groups including Community-Based Disaster Risk Reduction networks. Early warning and evacuation protocols engage agencies such as the Philippine Atmospheric, Geophysical and Astronomical Services Administration for tsunami advisories and the Maritime Industry Authority for port closures. Critical lifeline resilience projects have been funded through programs with the Japan International Cooperation Agency and United States Agency for International Development to strengthen hospitals, schools, and bridges.
Seismic monitoring is led by the Philippine Institute of Volcanology and Seismology with networks of seismometers linked to international centers like the United States Geological Survey, the Japan Meteorological Agency, and the International Seismological Centre. Research collaborations involve universities such as the University of the Philippines Diliman, Ateneo de Manila University, De La Salle University, Mindanao State University, and international partners including the Earth Observatory of Singapore. Projects investigate fault mapping with techniques from the Philippine Fault Mapping Project, paleoseismology studies in regions like Tarlac and Abra, tsunami modeling with the Pacific Tsunami Warning Center, and risk analytics used by the Asian Disaster Preparedness Center. Capacity building includes training via the ASEAN Coordinating Centre for Humanitarian Assistance on disaster management and exchanges with the U.S. Geological Survey and Japan Agency for Marine-Earth Science and Technology.