摘要
基于Fermat原理的射线追踪方法都是假定地震波的频率为无限,从而求取最小旅行时所对应的路径。然而实际地震波的频率是有限的,地震波主要在Fresnel带内沿尽可能短的路径进行传播。为了使得到的射线路径更符合实际情况,在原弯曲射线法的目标函数中加入一项与射线长度有关的惩罚项,实现了基于薄层介质模型的有限频率地震射线近似追踪。理论例子表明,该方法简单,计算速度快,效果良好。
Most ray tracing methods that are based on Fermat’s principle calculate the ray paths with minimum
traveltime under hypothesis that the frequency of seismic waves is infinitely high.In fact,the frequency of seis-
mic waves is finite and most energy propagates along the shortest paths within Fresnel zone.In order to obtain
more realistic ray paths,we added a penalty term that is related to the length of the path to the objective function
in ray tracing,and realized ray tracing of finite frequency seismic wave based on thinly layered model.The algo-
rithm is verified on theoretical model.
出处
《勘探地球物理进展》
2004年第3期182-185,共4页
Progress in Exploration Geophysics
基金
厦门大学科研基金
福建省自然基金(D0310001)
