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《Chinese Journal of Geophysics》 1987-03
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FINITE ELEMENT MODELLING OF ELASTIC WAVE PROPAGATING IN 2-D MEDIA AND ITS PRELIMINARY APPLICATIONS

WANG MIAO-YUE GUO YA-XI(Institute of Geophysics, Academia Sinica, Beijing)  
In this paper an algorithm of finite element modelling is discussed for elastic wave propagating in two dimensional media. Two analytical formulas of the initial motion and wave form of P wave are derived in time domain for a point force source directing vertically down as a function of time with a bell shape. Then the theoretical distribution of initial motion are compared with the results obtained by the finite element algorithm with 16 × 22 node points under similar conditions. The agreement is well. Analysis of various evidences for several cases including the arrival times, the distribution of initial motions, the wave form, and the motion of particles in a Rayleigh wave at the surface indicates that the finite element algorithm used here is more practical and has great potential in calculating real full wave synthetic seis-mogram.
【Fund】: 地质矿产部“六五”20-Ⅰ项攻关项目资助
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