| Mutation Anomalies of the Wave Velocity Ratio at a Single Station Before the Lancang-Gengma Earthquake |
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| 作者姓名： | Cai Jingguan Lei Suhua and Zhang Xiling Seismological Bureau of Yunnan Province Kunming China |
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| 作者单位： | Cai Jingguan，Lei Suhua，and Zhang Xiling Seismological Bureau of Yunnan Province，Kunming 650041，China |
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| 摘 要： | In this paper,the process of dynamic variation of the wave velocity ratio that occurred at a single station,such as Lancang,Tengchong,and Eryuan stations,8 years before the Lancang-Gengma earthquakes(Ms=7.6 and 7.2),is studied by applying the synthetic method as a whole.It is found that the moderately strong and strong earthquakes 250 km away that occurred since 1983 may lead to mutation anomalies of the wave velocity ratio in the Lancang region.The mutation amplitude is increased with the approaching time and distance of a large event.The reliability of mutation data for the wave velocity ratio has been demonstrated in many ways.The application of mutation of the wave velocity ratio to earthquake prediction and its physical explanation are discussed.
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Mutation Anomalies of the Wave Velocity Ratio at a Single Station Before the Lancang-Gengma Earthquake |
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| Cai Jingguan,Lei Suhua,and Zhang Xiling Seismological Bureau of Yunnan Province,Kunming ,China.Mutation Anomalies of the Wave Velocity Ratio at a Single Station Before the Lancang-Gengma Earthquake[J].Earthquake Research in China,1996(3). |
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| Authors: | Cai Jingguan Lei Suhua and Zhang Xiling Seismological Bureau of Yunnan Province Kunming China |
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| Institution: | Cai Jingguan,Lei Suhua,and Zhang Xiling Seismological Bureau of Yunnan Province,Kunming 650041,China |
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| Abstract: | In this paper,the process of dynamic variation of the wave velocity ratio that occurred at a single station,such as Lancang,Tengchong,and Eryuan stations,8 years before the Lancang-Gengma earthquakes(Ms=7.6 and 7.2),is studied by applying the synthetic method as a whole.It is found that the moderately strong and strong earthquakes 250 km away that occurred since 1983 may lead to mutation anomalies of the wave velocity ratio in the Lancang region.The mutation amplitude is increased with the approaching time and distance of a large event.The reliability of mutation data for the wave velocity ratio has been demonstrated in many ways.The application of mutation of the wave velocity ratio to earthquake prediction and its physical explanation are discussed. |
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| Keywords: | Seismic velocity ratio Earthquake prediction Earthquake precursor Yunnan Mutation |
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