Seismic hazard maps and spectrum for Patna considering region-specific seismotectonic parameters

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• 作者：P. Anbazhagan ; Ketan Bajaj ; Satyajit Patel
• 关键词：Earthquake ; Hazards ; Maximum magnitude ; GMPE ; PGA ; SA
• 刊名：Natural Hazards
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：78
• 期：2
• 页码：1163-1195
• 全文大小：4,509 KB
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• 作者单位：P. Anbazhagan (1)
  Ketan Bajaj (1)
  Satyajit Patel (2)
  
  1. Department of Civil Engineering, Indian Institute of Science, Bangalore, India
  2. Applied Mechanics Department, S.V. National Institute of Technology, Surat, India
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Hydrogeology
  Geophysics and Geodesy
  Geotechnical Engineering
  Civil Engineering
  Environmental Management
  
• 出版者：Springer Netherlands
• ISSN：1573-0840

文摘

The objective of this paper was to develop the seismic hazard maps of Patna district considering the region-specific maximum magnitude and ground motion prediction equation (GMPEs) by worst-case deterministic and classical probabilistic approaches. Patna,?located near Himalayan active seismic region has been subjected to destructive earthquakes such as 1803 and 1934 Bihar–Nepal earthquakes. Based on the past seismicity and earthquake damage distribution, linear sources and seismic events have been considered at radius of about?500?km around Patna district center. Maximum magnitude (M max) has been estimated based on the conventional approaches such as maximum observed magnitude (M max obs ) and/or increment of 0.5, Kijko method and regional rupture characteristics. Maximum of these three is taken as maximum probable magnitude for each source. Twenty-seven ground motion prediction equations (GMPEs) are found applicable for Patna region. Of these, suitable?region-specific GMPEs are selected by performing the ‘efficacy test,-which makes use of log-likelihood. Maximum magnitude and selected GMPEs are used to estimate PGA and spectral acceleration at 0.2 and 1?s and mapped for worst-case deterministic approach and 2 and 10?% period of exceedance in 50?years. Furthermore, seismic hazard results are used to develop the deaggregation plot to quantify the contribution of seismic sources in terms of magnitude and distance. In this study, normalized site-specific design spectrum has been developed by dividing the hazard map into four zones based on the peak ground acceleration values. This site-specific response spectrum has been compared with recent Sikkim 2011 earthquake and Indian seismic code IS1893.