| 丽江7.0级地震前地震波特征的时空演化过程 |
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| 引用本文： | 张喜玲,张爱玲.丽江7.0级地震前地震波特征的时空演化过程[J].地震研究,1997,20(1):108-116. |
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| 作者姓名： | 张喜玲 张爱玲 |
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| 作者单位： | 云南省地震局 |
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| 摘 要： | 本论述了１９９６年２月３日丽江７．０级地震前洱源、腾冲两个地震台的多项地震波运动学和动力学异常及滇西北多台波速比异常的特征，探讨了其时空演化的动态变化过程。得出：在时间进程上，多项地震波突变特征均在震前一年左右的时间出现。其中，波速比在大震前的单点突变异常幅度为中强震的５倍之多；振幅比突变异常幅度约为中强震的３－５倍；尾波持续时间比则是在震前一年左右出现持续性的低值，时间尺度约为中强震异常时间的
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| 关 键 词： | 地震前兆 地震波 时空演化 |
TIME-SPACE EVOLUTION PROCESS OF SEIMIC WAVE CHARACTERISTICS BEFORE THE M 7 0 LIJIANG EARTHQUAKE |
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| Zhang Xiling and Zhang Ailing.TIME-SPACE EVOLUTION PROCESS OF SEIMIC WAVE CHARACTERISTICS BEFORE THE M 7 0 LIJIANG EARTHQUAKE[J].Journal of Seismological Research,1997,20(1):108-116. |
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| Authors: | Zhang Xiling and Zhang Ailing |
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| Abstract: | The multiple anomalies of seismic wave in kinematics and dynamics observed at Eryuan and Tengchong stations, Vp/Vs ratio anomalies recorded at numerous stations in northwest Yunnan and their dynamic evolution process in time-space before the M 7 0 Lijiang earthquake on Feb 3, 1996 are discussed in this paper It is found that all the multiple mutation characters of seismic wave appeared about one year before the event; of the mutation characters the abrupt anomaly scale of Vp/Vs ratio at sigle point before the large event was 5 times of the scale of that before moderate-strong event; the abrupt anomaly scale of amplitude ratio before the large event was about 3-5 times of the scale of that before moderate strong event; the continuous time ratio of coda wave remained in low value of anomaly for about one year before the event and the time scale was about 3 times larger than that before moderate-strong event At same time, the analysis of spatial image evolution shows that a turn in the strike of anomalous area of velocity ratio in strip distribution appeared 1-3 years before the event, and the intersection area of anomalous strips with the turns is the epicenter of future large event Therefore, the abrupt in large scale of seismic wave in some time interval or the intersection area of velocity ratio anomalies with turns in strikes may be a precursor information of medium-short term before great event And also, the spatial location of mutation point has some meaning to futrue great earthquake, but in does not mean the epicenter of the great earthquake |
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| Keywords: | Seismic wave mutation M 7 0 Lijiang earthquake Yunnan |
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