Authors: Singh Mridula Amita Sinvhal Hans Raj Wason Swati Singh Rajput
Publish Date: 2016/06/25
Volume: 84, Issue: 1, Pages: 383-403
Abstract
During an earthquake longer faults and lineaments may not rupture over their entire length but may do so in smaller segments depending on some physical boundary in the fault that controls and defines the location and extent of rupture which may be governed by several factors such as presence of transverse tectonic features change in seismicity pattern along the fault difference in slip rates occurrence of significant lithologic changes strike of fault etc This paper is an attempt to identify segments of two megalineaments of Western Himalaya viz the Main Boundary Thrust MBT and Main Central Thrust MCT This was attempted by subjecting seismicity and tectonic data in a 7° × 7° study area to a pattern recognition technique Six segments of the 997kmlong MBT and five segments of the 800kmlong MCT were obtained in the study area These segments along with other tectonic features and seismicity of the region were included in assessment of seismic hazard and preparation of peak ground acceleration PGA mapsThe authors would like to thank the Department of Earthquake Engineering IIT Roorkee for providing academic support to carry out this research work The authors thank the Indian Meteorological Department New Delhi for the epicentral data provided Authors MS and SSR are grateful to the Ministry of Human Resource Development MHRD for financial support provided for the study
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