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Effect of seismic super-shear rupture on the directivity of ground motion acceleration

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Abstract

The effect of seismic super-shear rupture on the directivity of ground motions using simulated accelerations of a vertical strike-slip fault model is the topic of this study. The discrete wave number/finite element method was adopted to calculate the ground motion in the horizontal layered half space. An analysis of peak ground acceleration (PGA) indicates that similar to the sub-shear situation, directivity also exists in the super-shear situation. However, there are some differences as follows: (1) The PGA of the fault-normal component decreases with super-shear velocity, and the areas that were significantly affected by directivity in the PGA field changed from a cone-shaped region in the forward direction in a sub-shear situation to a limited near-fault region in a super-shear situation. (2) The PGA of the fault-parallel and vertical component is not as sensitive as the fault-normal component to the increasing super-shear velocity. (3) The PGA of the fault-normal component is not always greater than the fault-parallel component when the rupture velocity exceeds the shear wave velocity.

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Authors and Affiliations

  1. Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin, 150080, China

    Jinjun Hu & Lili Xie

  2. School of Civil Engineering and Architecture, Harbin Institute of Technology, Harbin, 150090, China

    Lili Xie

  3. Institute of Engineering Mechanics, China Earthquake Administration, Harbin, 150080, China

    Jinjun Hu

Authors
  1. Jinjun Hu
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  2. Lili Xie
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Correspondence to Jinjun Hu.

Additional information

Supported by: Basic Science Research Foundation of IEM, CEA under Grant No. 2011B02; 973 Program under Grant No. 2011CB013601; National Natural Science Foundation of China under Grant Nos. 51238012, 9121530113; International Science & Technology Cooperation Program of China under Grant No. 2012DFA70810

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Hu, J., Xie, L. Effect of seismic super-shear rupture on the directivity of ground motion acceleration. Earthq. Eng. Eng. Vib. 12, 519–527 (2013). https://doi.org/10.1007/s11803-013-0193-x

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  • DOI: https://doi.org/10.1007/s11803-013-0193-x

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