Rafael J. Padre, Robert A. Rodolfo, Rhonjohn R. Garming, Lope T. Buen
This study estimatedthe earthquake risk in the province with the use of Rapid Earthquake Damage Assessment System (REDAS) software. Actual building survey was taken from the three barangays of TabukCity: Suyang, Casigayan and DagupanWeste to represent residential, commercial and mixed commercial and residential buildings of the province. Survey data were used in creating the database for Kalingafor the simulation and earthquake risk analysis.Estimation of earthquake risk using REDAS was done based on 1949 historical earthquake event with a magnitude of 7.2 and a depth of 33kms. Results showed thatthe total estimated floor area damages in square meters are 267,814, 227,344, 115,812, 339,995and 2751.34 for slight, moderate, extensive, complete with no collapsed, and complete with collapsed damages. Based on the number of buildings, the total estimated damages under slight, moderate, extensive, complete with no collapsed, and complete with collapsed damages are 8948, 7290, 3620, 1044, and 75, respectively. The total estimated number of injuries across barangays of Kalinga is 641 minor injuries, 100 serious injuries, 5 very serious injuries and 21 fatalities with an economic loss of 2.602 billion pesos.This demonstrated that REDAS is a valuable tool to estimate the extent of damages from a natural phenomenon like earthquake. Information from the estimated extent of damages in particular areas of the province of Kalinga can guide those who are involved in disaster risk reduction planning and implementation.
Keywords: REDAS, earthquake risk, rapid assessment, inland active fault, Kalinga