Earthquake Impact Calculations of Kalinga Province Using Rapid Earthquake damage Assessment System (Redas) Software
Rafael J. Padre, Ronjohn R. Garming, Lope T. Buen, Robert A. Rodolfo

Abstract
This study was conducted to estimate earthquake risk in the province with the use of Rapid Earthquake Damage Assessment System (REDAS) software. There were three barangays from City of Tabuk, namely, Suyang, Casigayan and Dagupan Weste where actual building survey was taken to represent residential, commercial and mixed commercial and residential buildings of the province. These survey data were used in creating the database for Kalingafor the simulation and earthquake risk analysis in this study. 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 that the total estimated floor area damages in square meters are 267,814, 227,344, 115,812, 339,995and 2751 for slight, moderate, extensive, complete with no collapse, and complete with collapse damages. Based on number of buildings, the total estimated damages under slight, moderate, extensive, complete with no collapse, and complete with collapse 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 estimated total economic loss of 2.602billion pesos. This study has demonstrated that REDAS is a valuable tool to estimate the extent of damages from a natural phenomenon like an 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.

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