Lyapunov Exponents for 2-D Ray Tracing Without Interfaces

Lyapunov Exponents for 2-D Ray Tracing Without Interfaces
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无接口二维射线追踪的李雅普诺夫指数

DOI:
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发表时间:
2002
期刊:
影响因子:
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通讯作者:
L. Klimeš
L. Klimeš
中科院分区:
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文献类型:
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作者:
L. Klimeš

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摘要——李亚普诺夫指数沿着无限长的射线渐进地量化射线的指数发散。引入了有限二维射线的李亚普诺夫指数以及一组有限二维射线和二维速度模型的平均李亚普诺夫指数。提出了在给定的无接口的平滑二维速度模型中估计平均李亚普诺夫指数的方程,并通过数值例子进行了说明。这些方程允许在射线追踪之前估计射线的平均指数发散和速度模型中的行进时间分支数量的指数增长。
Summary— The Lyapunov exponents quantify the exponential divergence of rays asymptotically, along infinitely long rays. The Lyapunov exponent for a finite 2-D ray and the average Lyapunov exponents for a set of finite 2-D rays and for a 2-D velocity model are introduced. The equations for the estimation of the average Lyapunov exponents in a given smooth 2-D velocity model without interfaces are proposed and illustrated by a numerical example. The equations allow the average exponential divergence of rays and exponential growth of the number of travel-time branches in the velocity model to be estimated prior to ray tracing.