SITE-SPECIFIC DETERMINISTIC SEISMIC HAZARD ANALYSIS OF A COMMERCIAL BUILDING IN ATTOCK CITY, PAKISTAN

Abstract

This study presents a Site-Specific Deterministic Seismic Hazard Analysis (DSHA) for a proposed commercial building located in Mehria Town, Attock, Pakistan. The Attock region lies within a tectonically active zone influenced by the ongoing convergence of the Indian and Eurasian plates, making it vulnerable to moderate and strong seismic events. Major active fault systems in the surrounding area were identified and characterized, and shortest source to site distances were calculated using GIS and Google Earth tools. Peak Ground Acceleration (PGA) was estimated using two empirical attenuation relationships, Cornell, Banon et al (1977) [1] and Boore and Atkinson (2008) [2]. It was observed that among all the identified seismic sources, the Main Boundary Thrust (MBT) at epicentral distance 46.82 km with the maximum credible earthquake magnitude of Mw 7.6 was identified as the controlling seismic source. The highest estimated PGA for the site is 0.268g using the Cornell et al. relationship. The study results demonstrate that the study area is in moderate seismic hazard zone, and it is recommended to apply suitable seismic design measures following the Building Code of Pakistan (Seismic Provisions 2007).