Can Site Specific parameters help to identify the Seismically Induced Damage Pattern: An Assessment

Abstract

Indo-Gangetic plains are vulnerable to damage during earthquakes due to the presence of soft soil cover. Local geology and topography play a significant role in amplifying the damage and controlling the pattern of damage. In this study, an effort has been made to investigate the pattern of damage by using the different parameters which significantly varies spatially such as lithology, shear wave, soil texture, basement depth and distance to the fault. The logistic regression was performed on the training data was selected from the common damage zones provided in the catalogue a generalized damage pattern map was prepared for North Bihar without considering the earthquake source effect. The model achieved 55% accuracy and, further the prepared map was validated with the isoseismal map of 1934, 1988, 2015 Mainshock, and 2015 major aftershock, the area under the curve (AUC) determined as 0.54, 0.57, 0.56, and 0.60 respectively. The generalized map can be used with the ground motion parameter to estimate the extent of hazard after an earthquake.