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Near-field ground motion during earthquake preparation process

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Abstract

Wave number discretization method is applied to study the near-field of seismic sources embedded in a cracked elastic solid. Near-field solutions are obtained for horizontal and vertical line forces. Effects of modifications in cracks of focal region on ground motion, in the near-field, are studied numerically for different

  • ▪ values of crack density

  • ▪ saturation of cracks

  • ▪ width of cracks, and

  • ▪ regimes of connection between cracks.

An earthquake process is assumed to be going through five major stages. These stages represent continuous accumulation of stress, interconnections between cracks leading to eventual failure and drainage of fluid from cracks after the major shock. Variations in the velocity ratio of waves noted from accelerograms verify the process of preparation of an earthquake.P wave contribution to vertical acceleration is negligible when the source is a vertical line force andS wave contributes only a little to horizontal acceleration when the source is a horizontal line force.

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Authors and Affiliations

  1. Department of Atmospheric and Oceanic Sciences, Kurukshetra University, 136 119, Kurukshetra, India

    M. D. Sharma

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  1. M. D. Sharma
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Sharma, M.D. Near-field ground motion during earthquake preparation process. Proc. Indian Acad. Sci. (Earth Planet Sci.) 106, 15–26 (1997). https://doi.org/10.1007/BF02841747

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  • DOI: https://doi.org/10.1007/BF02841747

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