| 2017年琉球群岛6级地震前佘山地震台应变观测异常 |
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| 引用本文： | 倪友忠,吴珊珊,教聪聪,方韬.2017年琉球群岛6级地震前佘山地震台应变观测异常[J].地震地磁观测与研究,2018,39(4):158-163. |
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| 作者姓名： | 倪友忠 吴珊珊 教聪聪 方韬 |
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| 作者单位： | 中国上海 201602 佘山地震基准台 |
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| 基金项目： | 上海地震局科技专项（项目编号：2018专1） |
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| 摘 要： | 2017年5月9日琉球群岛6级地震发生前，佘山地震基准台YRY-4型钻孔应变仪的2个观测分量S2、S4，在M2波潮汐因子分析中表现出明显的趋势异常。通过实地调查排除环境、气象干扰，对应变与气压观测曲线的M2波潮汐因子γ值进行对比及量化分析，认为应变分量观测异常非环境干扰造成，应与琉球群岛6级地震发生有关。
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| 关 键 词： | 琉球群岛地震 地震前兆 钻孔应变 干扰 |
Strain observation anomaly of Sheshan Seismic Station before the M 6 earthquake in Ryukyu Islands |
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| Ni Youzhong,Wu Shanshan,Jiao Congcong,Fang Tao.Strain observation anomaly of Sheshan Seismic Station before the M 6 earthquake in Ryukyu Islands[J].Seismological and Geomagnetic Observation and Research,2018,39(4):158-163. |
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| Authors: | Ni Youzhong Wu Shanshan Jiao Congcong Fang Tao |
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| Affiliation: | Sheshan Seismic Reference Station, Shanghai 201602, China |
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| Abstract: | Before Ryukyu Islands M 6 earthquake, two observational components of YRY-4 borehole strain gauge at Sheshan observatories, S2 and S4, had obvious trend anomalies in M2 wave tide factor analysis. Based on the field investigation to exclude environment, meteorological interference analysis, comparative analysis, quantitative values of strain tide factor of M2 wave and the gamma observed value and the pressure of the tide factor of M2 wave observation that gamma, Sheshan Taiwan anomaly is not caused by interference of environment, should have genetic relationship with Ryukyu Islands M 6 earthquake. |
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| Keywords: | earthquake in the Ryukyu Islands earthquake precursors borehole strain interference |
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