浅源极远震的震相特征与识别方法  

TO DISTINGUISH OF SEISMIC PHASE IN THE SHALLOW VERY DISTANT QUAKE

作　　者：刘家愚 张义梅 

机构地区：[1]湖南省地震局,长沙410001

出　　处：《华南地震》1998年第4期69-73,共5页South China Journal of Seismology

摘　　要：介绍了纵波在地球内部的传播过程和浅源极远震的震相特点。由不同震中距的地震反映在三分向地震记录图上的初至震相振幅比的差异 ,归纳出由地震初动判别地震类型的方法 ,结合实际工作经验 ,得出如何判别PKS震相、如何由PP推S、由SS反推PP震相 ,以及根据地震面波的到时 ,通过《Rm-P》This artical had introduced the P wave's propagation process in the earth internal and the phases characteristics of very distant shallow earthquake,and concluded a method to recognize the diffent focus distance earthquakes from their 3D seismogram's first arrival phases and amplitude ratio difference.We summarized a way,combining with the working experience,to determinate the PKS wave phase.Clerive the S wave phases from PP wave phase. Clerive PP phases from SS wave phases. Then check up the phases and focus distance with 《SEISMICPHASES TABLE》.

关 键 词：地震波 震相 地震射线 极远震 识别法 

分 类 号：P315.63[天文地球—地震学] P315.3[天文地球—固体地球物理学]