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Geomechanics and Engineering
  Volume 13, Number 3, September 2017 , pages 411-430

The topographic effect of ground motion based on Spectral Element Method
Xinrong Liu, Meihai Jin, Dongliang Li, Yuanxin Hu and Jianxue Song

    A Spectral Element Method for 3D seismic wave propagation simulation is derived based on the threedimensional fluctuating elastic dynamic equation. Considering the 3D real terrain and the attenuation characteristics of the medium, the topographic effect of Wenchuan earthquake is simulated by using the Spectral Element Method (SEM) algorithm and the ASTER DEM model. Results show that the high PGA (peak ground acceleration) region was distributed along the peak and the slope side away from the epicenter in the epicenter area. The overall distribution direction of high PGA and high PGV (peak ground velocity) region is parallel to the direction of the seismogenic fault. In the epicenter of the earthquake, the ground motion is to some extent amplified under the influence of the terrain. The amplification effect of the terrain on PGA is complicated. It does not exactly lead to amplification of PGA at the ridge and the summit or attenuation of PGA in the valley.
Key Words
    topographic effect; Spectral Element Method; seismogenic; peak ground acceleration; peak ground velocity; peak ground displacement
(1) School of Civil Engineering, Chongqing University, Chongqing 400045, China;
(2) Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing.

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