摘要
本文在论述地震体波成像中速度模型间断面的引入、体波多震相的利用等优越性的同时,利用研究区之外、能改善或分辨地球内部更深处的远震资料,得到研究区平均相对走时残差的分布.结果表明:1.采用相对走时残差消除了模型区域外的地球模型的影响,从而使得在远震理论走时计算中,球状分层各向同性参考地球模型的选取是不重要的;2.平均相对走时残差的分布与研究区内构造分区相关;3.
This paper discusses several aspects of seismic body wave tomography,which are velocity discontinuity being introduced in the model,body wave multi-phase being utilized,and teleseismic data out of the study region being inverted simultaneously. The mean relative travel time residual was calculated by the teleseismic data that can improve or get the resolution of the deeper interior of the Earth. The results show that:it eliminated the error introduced by the Earth model out of the study block by using relative travel time residual,so it is not important to choose a reference Earth model when calculating theoretical travel time for teleseismic data;the distribution of mean relative travel time residual is generally consistent with the main structural feature of the study region;the effect of the Earth’s ellipticity on the inverse results is very small.
出处
《地球物理学进展》
CSCD
1999年第4期9-17,共9页
Progress in Geophysics
基金
国家高技术研究发展计划 !( 86 3计划 )82 0 -0 1 -0 4课题资助
关键词
地震体波成像
地震勘探
地球模型
地震数据
远震
Discontinuity
Later arrival
The Earth model
Teleseismic events
Residual
Correction for the Earth’s ellipticity
