Separation of P- and S-waves With an Irregular Topography

• Main Authors: Yang, Chien-hui, 楊千慧
• Other Authors: Robert Sun
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/53590230954268031483

碩士 === 國立成功大學 === 地球科學系 === 89 === The P- and S-waves propagating in an elastic media with an irregular surface can be separated by divergence and curl calculations using modified finite difference scheme that fits the surface topography. Curved horizontal grid lines, which are concordant with the surface topography rather than flat horizontal lines, are used in the finite difference scheme. The spatial derivatives in the wave equations are modified to accommodate the horizontal grid lines curvature. The Virieux’s staggered-grid finite-difference scheme that simulates the stress-particle velocity wave equation is used for wave-propagation calculation. Divergence and curl calculations, in which the spatial derivatives are modified to fit the surface topography as well, are implemented on vertical and horizontal particle velocity components that are taken as the recorded seismic response (which is the applied response in field records). Our synthetic experiments show that this wavetype separation algorithm is successful in 2-dimensional media with irregular surface.