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6Šª
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1982”N
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417-424•Å
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PROCEEDINGS OF JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM
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Yoshiji NIWA, Masayasu OHATSU, Sohichi HIROSE
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SEISMIC WAVE ANALYSIS FOR A DIPPING LAYER
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In this paper, the seismic wave motions, especially, in regard to diffracted or scattered waves in a dipping layer are investigated. The surface displacements are calculated in the time domain and the frequency domain by two theoretical methods, I.e., by the boundary integral equation (B.I.E.) method and the ray theory. A comparison between results by these two methods has shown that the diffracted wave has much effect on the surface ground motions in the case that the discontinuity planes based on the ray theory are located in the vicinity of the free surface or the dipping boundary and the displacement discontinuities in the ray theory are large. Experimentally, model studies for a dipping layer are carried out by the acoustic emission (A.E.) method. The detected waves are simulated analytically and analyzed in the frequency domain. It is shawn that they are in good agreement with results obtained by the B.1.E. method.
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