This method involves forward modeling wavefield identification,interactive travel time pickup,minimum travel time ray tracing in the interface net,spline coefficient inversion instead of slowness inversion and final velocity field synthesising.
该方法利用正演模型识别波场，用交互法拾取走时，采用界面网最小走时射线追踪法进行射线追踪，并用反演样条系数代替反演慢度，最后合成速度场。
However,multiple modes and different dispersion properties make travel time extraction of single mode difficult.
薄板超声Lamb波层析成象研究中,走时是重要的信号特征,但多模式和频散特点给单一模式走时提取带来困难,一般信息提取技术对Lamb波分析较难有理想结果。
Exact traveltime computation in multi-layered transversely isotropic media with vertical symmetry axis;
多层垂直对称轴横向各向同性介质精确走时计算
(1) To ensure the stability of the program,we also consider the refracted and diffracted waves to calculate the traveltimes.
回顾了波前扩展有限差分地震波走时算法及其主要优缺点,分析了该算法在程序实现过程中存在的一些问题。
Traveltime-computation is widely used in seismic modeling, imaging and velocity analysis, etc.
走时计算已广泛用于地震建模、成像及速度分析等诸方面。
Fast marching method (FMM) is a fast, accurate and stable traveltime computation method.
波前快速推进法(FMM)是一种快速、准确而稳定的走时计算方法,它不仅计算速度快、灵活性好,而且对任何复杂速度场都具有无条件稳定的特点。