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一、引言 地震面波的频散性质、地震波辐射的方向性等特性已经广泛地用于地壳和上地幔结构以及震源机制的研究中,并且取得了许多有用的成果.研究地震波如何从震源辐射出来、如何在实际介质中传播和衰减的这一问题,对于利用地震波确定地壳和上地幔结构以及震源的参数,是很有必要的.关于这一问题的研究,已经作过许多工作。已往的工作中,为了分析方便,往往采用简单的地壳—上地幔模型或简单的震源模型,或两者都相
I. INTRODUCTION The dispersive nature of seismic surface wave and the directivity of seismic wave radiation have been widely used in the study of crustal and upper mantle structure and focal mechanism and many useful results have been obtained.It is studied how the seismic wave radiates from the source , How to propagate and decay in the actual medium is very necessary for using seismic waves to determine the structure of the crust and the upper mantle and the parameters of the hypocenter.A great deal of work has been done on the research of this issue. In the past work, simple crust-upper mantle model or simple hypocenter model, or both