南北地震带北段上地幔速度结构成象(Ⅱ)--数值模拟计算

IMAGING OF VELOCITY STRUCTURE OF THE UPPER MANTLE FOR THE NORTHERN PORTION OF NORTH-SOUTH SEISMIC BELT(Ⅱ)-NUMERICAL EXPERIMENTS

摘要:

本文在文献[1]的基础上,详细地讨论了用代数重建法对南北地震带北段上地幔进行速度结构成象的数值试验的具体步骤及其结果,指出在目前地震台网布局及观测精度下,用研究区台站记录到的天然地震资料可以得到较好的成象结果。在反演计算中,地壳速度模型和莫霍面倾角的选取是直接关系到成象结果好坏的重要因素。

Abstract:

Based on reference[1], the numerical experiments, its processes and results of the imaging for the seismic velocity structure of upper mantle in the northern portion of North-South Seismic Belt, using the ART Method, are discussed in detail. It is suggested that in the present case of station distributions and its observational precision, satisfactory imaging results maybe obtain ed, using natural earthquake data recorded by stations located in and near studied region, and that in inversion calculation, the crustal velocity model as well as the selecting of the Moho dip angle are the important factors associated with the quality of imagine directly.