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用宏观方法测定震源深度的量版
引用本文:刘正荣. 用宏观方法测定震源深度的量版[J]. 地球物理学报,1961,10(02): 113-119,
作者姓名:刘正荣
作者单位:中国科学院地球物理研究所
摘    要:根据常用公式 h=Δi/10(I0-Ii)/s-11/2,式中h为震源深度,Δi为烈度为Ii的等震綫半径,I0为震中烈度,S为一系数;取(1)式的对数得 logh=logΔi-1/2log[10(I0-Ii)/s-1],按(2)式可以作成一量版,以同时測定h和s。利用这个量版測定了19个中国地震的s和h,結合文献[4]的資料,指出中国东部的s系数比西部的偏低;且当深度加大时,s系数加大。采用文献[1,5]的資料測定了61个地震的s系数,結果表明s的数值随深度的增加而加大,占与低速层的关系并不明显。

关 键 词:震源深度   震中烈度   宏观方法   中国地震   透明版   同时测定   低速层   递减系数   地震活动性   中国东部

A GRATICULE FOR THE MACROSEISMIC DETERMINATION OF THE DEPTH OF FOCUS OF AN EARTHQUAKE
LIU CHENG-JUNG. A GRATICULE FOR THE MACROSEISMIC DETERMINATION OF THE DEPTH OF FOCUS OF AN EARTHQUAKE[J]. Chinese Journal of Geophysics (in Chinese),1961,10(02): 113-119,
Authors:LIU CHENG-JUNG
Affiliation:Institute of Geophysics and Meteorology,Academia Sinica
Abstract:Starting from the frequently adopted formula h=△i/(10(I0-Ii)/S—1)1、2,where h is the focal depth,Ai is the mean radius of the ith isoseismal,I0 is the epicentral intensity and s is a parameter and taking the common logarithm,we have log h=log△i—1/2log (10I0-Ii/S)—1),A graticule can be constructed on the basis of this formula with s as a variable parameter. By use of this graticule,the values of s and h for 19 Chinese earthquakes were determined and it was found that the s-values for Eastern China are lower than those for Western China. According to the material for 61 earthquakes,it was found that the value of s increases with the focal depth; however,its relation with the low-velocity layer is not evident.
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