Empirical seismic fragility functions based on field survey data after the 5 May 2014 Mae Lao (Northern Thailand) earthquake

Abstract

Empirical seismic fragility curves have been developed based on post-seismic survey data on official building damage, collected in the epicentral area of Mw 6.1, 2014 Mae Lao earthquake. In total, about 26,551 survey building data have been investigated by authorities and engineers. The typical pattern of observed damage for different structures and the reasons for damage are presented. In addition, damage statistics in the field are correlated with ground motion in order to derive empirical seismic fragility curves. Using a maximum likelihood method, different sets of fragility curves are developed to demonstrate the influence of structural material on building damage level. The good correlation between observed damage and peak ground acceleration (PGA) are observed. In addition, the results show a better seismic performance of the engineered reinforced concrete building over non-engineered buildings. These findings are essential to support a better future building damage assessments, land use management, and seismic risk mitigation planning.