| 用宏观方法测定震源深度的量版 |
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| 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(2):113-119. |
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| 作者姓名： | 刘正荣 |
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| 作者单位： | 中国科学院地球物理研究所 |
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| 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-1/2log10（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。
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| 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 |
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| LIU CHENG-JUNG.A GRATICULE FOR THE MACROSEISMIC DETERMINATION OF THE DEPTH OF FOCUS OF AN EARTHQUAKE[J].Chinese Journal of Geophysics,1961,10(2):113-119. |
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| Authors: | LIU CHENG-JUNG |
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| Institution: | Institute of Geophysics and Meteorology, Academia Sinica |
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| 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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