Synthetic seismograms in laterally heterogeneous, anelastic media by modal summation of P‐SV‐waves
Synthetic seismograms in laterally heterogeneous, anelastic media by modal summation of P‐SV‐waves
复制标题
通过 P-SV 波模态求和在横向不均匀、滞弹性介质中合成地震图
DOI：
10.1111/j.1365-246x.1989.tb01688.x
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
G. Panza
中科院分区：
文献类型：
--
作者：
F. Vaccari;S. Gregersen;M. Furlan;G. Panza
摘要
在用振型总和法计算合成地震记录时，当考虑具有陡峭横向不连续性的介质时，耦合系数ΓJj_1起着基本的作用。系数Γjj由一个涉及位移和应力之间乘积的积分关系定义，可以用数值和解析两种方法计算。ΓJJ的计算可归结为初等函数积分和的解析计算。这种分析方法特别方便，因为它的速度和结果的精度。
从频率和时间两个方面说明了不同模式下的能量再分配。在处理更高模式时，模式转换不能被忽略。
Summary
In the computation of synthetic seismograms by modal summation, when a medium with a sharp lateral discontinuity is considered, a fundamental role is played by a coupling coefficient Γjj,. The coefficient Γjj, is defined via an integral relation involving products between displacements and stresses and can be evaluated both numerically and analytically. The calculation of Γjj can be reduced to the analytical computation of a sum of integrals of elementary functions. The analytical method proved to be particularly convenient for its speed and precision of the results obtained.
The energy redistribution within the different modes is illustrated, both in the frequency and in the time domain. Mode conversion cannot be neglected when dealing with higher modes.