• Estimation of hypocentral parameters of local earthquakes when crustal layers have constantP-velocities and dipping interfaces

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      https://www.ias.ac.in/article/fulltext/jess/096/03/0229-0238

    • Keywords

       

      Hypocentral parameters; dipping interfaces; sequential unconstrained optimization; penalty function approach; earthquakes

    • Abstract

       

      The paper describes an algorithm for estimating the hypocentral coordinates and origin time of local earthquakes when the wave speed model to be employed is a layered one with dipping interfaces. A constrained least-squared error problem has been solved using the penalty function approach, in conjunction with the sequential unconstrained optimization technique of Fiacco and McCormick. Joint confidence intervals for the computed parameters are estimated using the approach of Bard for nonlinear problems. These results show that when a hypocentre lies outside the array of recording stations and head waves from a dipping interface are involved, then its inclination must be taken into account for dip angles exceeding 5°.

    • Author Affiliations

       

      Irene Sarkar1 R Chander1 K N Khattri1 V K Gaur1 2

      1. Department of Earth Sciences, University of Roorkee, Roorkee - 247 667, India
      2. National Geophysical Research Institute, Hyderabad - 500 007, India
    • Dates

       
  • Journal of Earth System Science | News

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