Modeling Earthquake Vulnerability of Highway Networks ˙ Idil Ar¸ sık 1 Department of Industrial Engineering Ko¸cUniversity Istanbul, Turkey F. Sibel Salman 2 Department of Industrial Engineering Ko¸cUniversity Istanbul, Turkey Abstract In this study, we investigate the earthquake vulnerability of highway networks whose links are subject to failure. We propose a model called α-conservative failure model that aims to capture the dependency among link failures in the event of an earth- quake. According to this model, we calculate a path-based accessibility measure to assess the expected weighted average shortest distance to serve a unit demand after the earthquake. We test the proposed link failure model on a case study of the earthquake vulnerability in Istanbul. Keywords: Network Vulnerability, Reliability, Dependent Link Failures, Disaster Risk of Highways 1 Email: iarsik@ku.edu.tr 2 Email: ssalman@ku.edu.tr Available online at www.sciencedirect.com Electronic Notes in Discrete Mathematics 41 (2013) 319–326 1571-0653/$ – see front matter © 2013 Elsevier B.V. All rights reserved. www.elsevier.com/locate/endm http://dx.doi.org/10.1016/j.endm.2013.05.108