| 2016年3月12日运城MS4.4地震地磁谐波振幅比异常分析 |
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| 引用本文： | 刘素珍,李自红,刘瑞春.2016年3月12日运城MS4.4地震地磁谐波振幅比异常分析[J].地震地磁观测与研究,2018,39(2):50-56. |
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| 作者姓名： | 刘素珍 李自红 刘瑞春 |
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| 作者单位： | 1. 中国太原 030021 山西省地震局;2. 中国山西 030025 太原大陆裂谷动力学国家野外科学观测研究站 |
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| 基金项目： | 山西省地震局科研项目（项目编号：SBK-1826）；中国地震局地质研究所基本科研业务专项（项目编号：IGCEA1416）；山西省自然科学资金（项目编号：2015011084）；山西省科技攻关项目（项目编号：20140313023-1）；山西省科技攻关项目（项目编号：20150313016-2） |
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| 摘 要： | 利用山西省临汾地磁台记录的数字化FHD分钟值数据，采用地磁谐波振幅比方法，分析2016年3月12日山西运城MS 4.4地震前后地磁异常数据。结果显示：2015年1月—2016年2月，在周期10—60 min内，YZHx和YZHy方向出现反向异常变化，YZHx和YHxHy出现准同步的“下降—转折—恢复”过程；运城MS 4.4地震前，YZHx和YHxHy处于由高转低再上升的转折点，震前异常持续时间约1年3个月。结合山西南部地区GPS基线时间序列、重力场和临汾地震台地电阻率变化，根据震磁机理和电磁感应理论等，更好地解释了临汾地磁谐波振幅比异常。
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| 关 键 词： | 谐波振幅比 GPS基线时间序列 重力 异常 |
Anomaly analysis of the amplitude ratio of geomagnetic humorous for MS4.4 Yuncheng earthquake in 2016 |
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| Liu Suzhen,Li Zihong,LiuRuichun.Anomaly analysis of the amplitude ratio of geomagnetic humorous for MS4.4 Yuncheng earthquake in 2016[J].Seismological and Geomagnetic Observation and Research,2018,39(2):50-56. |
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| Authors: | Liu Suzhen Li Zihong LiuRuichun |
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| Institution: | 1. Shanxi Earthquake Agency, Taiyuan 030021, China;2. National Continental Rift Valley Dynamics Observatory of Taiyuan, Shanxi Province 030025, China |
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| Abstract: | Based on the geomagnetic data at Linfen Seismic Station in Shanxi, geomagnetic anomaly before the MS 4.4 Yuncheng earthquake on 12 March 2016 was found by the geomagnetic harmonic wave amplitude ratio method. It was found that the geomagnetic harmonic wave amplitude ratios YZHx and YZHy were the reverse changes before the earthquake, the geomagnetic harmonic wave amplitude ratios YZHx and YHxHy had quasi synchronous characteristics of "down-turning-recovery" during the period of 10 to 60 minutes from January 2015 to February 2016. The earthquake occurred when YZHx and YHxHy were from the turning point to recovery phase. Anomaly duration was about 1 year and 3 months before the earthquake. Combining GPS baseline time-series and gravity variation, according to the theory of seis-magnetism and electromagnetic induction, the amplitude ratio of magnetic harmonics in Linfen is better explained. |
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| Keywords: | harmonic wave amplitude ratio GPS baseline time-series gravity anomaly |
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