| 澜沧－耿马大震前单台波速比突变异常的时空变化特征 |
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| 引用本文： | 蔡静观,雷素华,张喜玲.澜沧－耿马大震前单台波速比突变异常的时空变化特征[J].中国地震,1996(1). |
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| 作者姓名： | 蔡静观 雷素华 张喜玲 |
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| 作者单位： | 云南省地震局 |
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| 摘 要： | 用整体的观点、综合的方法研究了１９８８年澜沧－耿马７．６、７．２级大震前８年中澜沧、腾冲、洱源３个地震台单台波速比（简称波速比）的动态变化过程，发现自１９８３年始，远在２５０ｋｍ以外地区发生的中强震、强震可引起澜沧地区波速比突变，其突变幅度随大震的临近和距离的逼近而增大。对波速比突变数据的可靠性进行了多方面的论证，并对波速比突变异常在地震预报中的应用及其物理成因进行了探讨。
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| 关 键 词： | 地震波速比，地震预报，地震前兆，云南，突变 |
The Variation Characteristics of Abrupt Anomalies of Wave Velocity Ratio in Single Station Before the Lancang-Gengma Large Earthquake |
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| Cai Jingguan,Lei Suhua,Zhang Xiling.The Variation Characteristics of Abrupt Anomalies of Wave Velocity Ratio in Single Station Before the Lancang-Gengma Large Earthquake[J].Earthquake Research in China,1996(1). |
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| Authors: | Cai Jingguan Lei Suhua Zhang Xiling |
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| Abstract: | In this paper, the dynamic variation's process of wave velocity ratio occurred in single station at Lancang, Tancheng and Eryuan stations eight years before Lancang-Gengma large earthquake (Ms =7. 6, 7. 2), is studied by using the synthetic method as a whole. It is found that moderate and strong earthquakes took place since 1983 in the region that is 250km far away from the large earthquake, it may lead to abrupt anomalies (abruptness) of wave velocity ratio in Lancang region, the abruptness amplitude is increased with approaching of time and distance of a large event.The reliance of abruptness data for wave velocity ratio has been demonstrated in many ways. The application of abruptness of wave velocity ratio to earthquake prediction and it's physical explanation have been discussed. |
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| Keywords: | Seismic velocity ratio Earthquake prediction Earthquake precursor Yunnan Mutation |
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