Spatial characteristics of motion in plane P-wave incident semi-infinite medium

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (15) : 80-86.

HE Weiping 1,2 ZHOU Yihong 1,2

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Abstract

Aiming at the problem of spatial diversity of seismic motion, the method of the wave theory combined with the superposition principle was used to study seismic motion’s spatial characteristics.Plane P-wave vertical incident semi-infinite medium and that oblique incident semi-infinite medium, respectively were taken as examples to study spatial characteristics of particle motion caused by superposition of incident wave and reflected one.The results showed that the superposition mode of mass point motions caused by seismic wave is taken as a basis, the semi-infinite medium can be divided into superposition zone and separation one; in superposition zone, incident wave and reflected one affect particle motion’s holding time, peak value and time history shape; in separation zone, the contribution of incident wave and reflected one to particle motion reveals separation features in time domain; seismic motion’s spatial diversity caused by superposition mode of seismic wave is more obvious, so studying effects of superposition mode of seismic wave on spatial characteristics of seismic motion is of great significance.

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HE Weiping 1,2 ZHOU Yihong 1,2. Spatial characteristics of motion in plane P-wave incident semi-infinite medium[J]. Journal of Vibration and Shock, 2019, 38(15): 80-86

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