Development of First Grade Seismic Microzonation Map for Surigao City, Surigao del Norte, Caraga, Philippines

a 6.7 magnitude earthquake struck Surigao City, causing severe structural damage, unsafe airport runways, and collapsed bridges and roads.This event highlighted the city's lack of earthquake engineering and land-use planning.This study addresses the need for risk mitigation by creating a seismic microzonation map for Surigao City.Using seven thematic maps-Basement Topography, Geology, Geomorphology, Landslide Zonation, Site Classification, Spectral, and Peak Ground Accelerations-the study employs the Analytical Hierarchy Process (AHP) to assign weights with input from five respondents.Integrating these layers in QGIS, the resulting map classifies areas into Low, Moderate, and High vulnerability categories, emphasizing Peak Ground Acceleration (21.3%) in earthquake hazard assessment.The map indicates that most of Surigao City's mainland is in the moderate seismic hazard category.