| 用单台四震相法讨论唐山大震的波速异常 |
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| 引用本文： | 姜秀娥
,陈非比.用单台四震相法讨论唐山大震的波速异常[J].地球物理学报,1981,24(1):107-116. |
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| 作者姓名： | 姜秀娥 陈非比 |
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| 摘 要： | 本文提出一个用单台相对时间测定地震波速度比的简单方法--四震相法,它是利用地方震记录上经常出现的莫霍界面反射波与直达波到时差求得的。 利用该方法测定了1976年7月28日唐山7.8级大震前后的波速比,发现震前经历了波速低值-恢复和高值-二次下降三个阶段;根据波速变化的时、空特征,结合地质背景与地震活动,对唐山大震的孕育过程作了初步探讨。
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| 关 键 词： | 波速异常 唐山大震 波速比 震相 波速变化 沧东断裂带 小震 闭锁区 中强地震 菱形块 |
| 收稿时间： | 1979-06-04 |
THE DISCUSSION OF VELOCITY CHANGE OF TANGSHAN EARTHQUAKE USING SIMPLE FOUR PHASE METHOD |
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| JIANG XIU-E CHEN FEI-BI.THE DISCUSSION OF VELOCITY CHANGE OF TANGSHAN EARTHQUAKE USING SIMPLE FOUR PHASE METHOD[J].Chinese Journal of Geophysics,1981,24(1):107-116. |
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| Authors: | JIANG XIU-E CHEN FEI-BI |
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| Abstract: | A simple method for measuring VP/VS by using relative time of a station is. proposed, the ratio being obtained by using arrival time differences between reflected wave in M-discontinuity and direct wave.The ratio of velocities before and after Tangshan earthquake of 1976 is measured by using this method; it is found that there are three stages of variation before earthquake, i.e. low velocity value - recovery and high velocity value - second drop of velocity. We investigated primarily preparatory process of Tangshan earthquake from characteristic distribution of velocity changes in space and time, connected with seismi-city and geological setting. |
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