Probabilistic Fling Hazard Map of India and Adjoined Regions

ABSTRACT

The present work aims at developing the first probabilistic fling hazard map of India and adjoined regions. First, we developed a new ANN-based ground motion prediction equation (GMPE) for fling corresponding to horizontal and vertical directions. The developed GMPE is based on permanent ground residual displacement form 556 scenario events considered consistent with the regional characteristics. The corresponding simulations are performed by suitably combining the Okada’s solutions. Developed GMPE is comparable with the existing relations and the few available data which contained fling characteristics. Further, the developed GMPE, along with the other two available prediction equations for the fling, is incorporated to represent the ground motion characteristics in the estimation of hazard using a suitable logic tree. In addition to the fling prediction equations, the evaluation of regional fling hazards requires identifying the location of all the probable seismic sources and their seismicity characteristics. In this study, we used the linear-fault model, as the fling is a near field phenomenon. We report the resultant probabilistic fling hazard map for 10%,2% 1%, and 0.5% probability in 50 Years for the region. The maps showed that the active regions in Himalayas, North-Eastern India, and Andaman experience higher values for fling than stable Peninsular India. Thus, this study develops the fling hazard map for the first time, and the results are essential in the design and rehabilitation of important structures in the region.

INDEX TERMS:

• Seismic hazards
• fling
• GMPE
• PSHA
• long period
• lifeline structures

Acknowledgments

We would like to extend our thanks to Prabhu Muthuganeisan for his suggestions that helped in proper implementation of hazard estimation procedure. The financial support received from Department of science and technology (DST) with project number  CIE1213195DSTXSTGR is also gratefully  acknowledged. Wewould extend our thanks to the reviewers for their insightful comments that helped in improving the quality of presentation of this work.