地震波衍射层析成像

DIFFRACTION TOMOGRAPHY FOR SEISMIC WAVES

1. 长春地质学院;2. 大连理工大学

1. Changchun University of Earth Science;2. Dalian University of Technology

本文讨论了声波及弹性波层析成像技术,导出了由观测波场提取介质参数的公式。在含有变密度的波动方程中,利用反传算法,在不同的空间频率上均可提取速度及密度参数。对于弹性波,我们可以利用四种散射场,即P-P、P-S、S-P、S-S波场恢复弹性参数。

This paper starts with a review related to the tomography for acoustic / clastic waves and then proceeds to the formula derivation for medium parameters from observed wave-fields. By using the Back-propaga tion algorithm, parameters including the velocity and the density arc able to be extracted for different frequencies based on the wave equation involving varying density parameters. For clastic waves, there arc four scattering wave modes (P-P, P-S, S-P and S-S) which arc exploitable for the recovery of clastie parameters.