华北地区天然地震震相特征研究

Primary research of natural earthquake phases in the north China region

本文主要分析了华北地区区域地震中6种常规震相(Pg、PmP、Pn、Sg、SmS、Sn)的基本特征,分析了华北地区东、西部分区清晰的震相特征。利用地壳分层构造特征以及理论走时计算等方法对人工震相读数结果进行了分析比较。另外还重点讨论了在华北地区区域测震台网常规震相分析工作中应该引起高度重视的深度震相sPn及其在震源深度准确测定中推广使用的可能性。

By the analysis of the six conventional seismic phases（Pg,PmP,Pn,Sg,SmS,Sn,etc.） of earthquakes in the north China region,this article researches on its basic seismic phase characteristics.It analyzes the clear seismic-phase characteristics on the Eastern and Western Divisional regions in the north China region.By means of the layered structure characteristic of the earth＇s crust and the theoretical calculation of travel time,the paper analyzes and compares the results of the artificial seismic phase readings.It also points out the seismic network of conventional phase analysis should pay close attention to the depth of phase sPn in the north China region.The paper discusses the possibility of promoting the accuracy in determining focal depth.