| 2016年门源6.4级地震地磁谐波振幅比异常特征分析 |
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| 引用本文： | 李霞,冯丽丽,赵玉红,苟智栋.2016年门源6.4级地震地磁谐波振幅比异常特征分析[J].地震地磁观测与研究,2018,39(3):81-88. |
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| 作者姓名： | 李霞 冯丽丽 赵玉红 苟智栋 |
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| 作者单位： | 中国西宁 810001 青海省地震局 |
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| 基金项目： | 青海省地震科学基金（项目编号：2017A05） |
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| 摘 要： | 2016年门源6.4级地震为甘—青地区孤立地震事件，且震中附近地磁台站分布均匀，分析总结此次地震前后地磁谐波振幅比变化特征。结果显示：①地震发生前后，震中附近台站地磁谐波振幅比下降—转折—恢复的异常变化过程，持续时间约1—2年；②震中距较小的台站记录显示，地震基本发生在谐波振幅比曲线转折恢复的变化后期阶段，且异常持续时间长；震中距较大的台站记录显示，地震一般发生在曲线趋势性下降—转折阶段，且异常持续时间稍短；③地震发生后，距震中较近的台站1年内YZHx（NS）和YZHy（WE）方向所有或大部分周期基本趋于恢复状态，且同步变化；距震中较远的台站1年内YZHx（NS）和YZHy（WE）方向大部分周期未达到恢复状态，且不同步变化显著。
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| 关 键 词： | 谐波振幅比 门源6.4级地震 前兆异常变化 |
Analysis on the magnetic harmonic wave amplitude ratio characteristics before Menyuan MS 6.4 earthquake in 2016 |
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| Li Xia,Feng Lili,Zhao Yuhong,Gou Zhidong.Analysis on the magnetic harmonic wave amplitude ratio characteristics before Menyuan MS 6.4 earthquake in 2016[J].Seismological and Geomagnetic Observation and Research,2018,39(3):81-88. |
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| Authors: | Li Xia Feng Lili Zhao Yuhong Gou Zhidong |
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| Institution: | Qinghai Earthquake Agency, Xining 810001, China |
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| Abstract: | In this paper, Menyuan MS 6.4 earthquake was analyzed by the geomagnetic harmonic amplitude ratio method based on isolated earthquake type in study area and uniform geomagnetic stations distribution near the epicenter. The analysis results showed the characteristics of long-term tendency anomaly of geomagnetic harmonic amplitude ratio, the abnormality duration of earthquake with M ≥ 5 is 1-2 years. Most of strong earthquakes occurred in the transition phase, restoring and rising phase for the observation stations closer to the epicenter with long anomalous duration, and the early phase of the restoring for the observation stations farther away from the epicenter with short anomalous duration. Further, nearly all the geomagnetic humorous amplitude ratio curves tend to synchronous restoring phase for the observation stations closer to the epicenter after earthquake within 1 year, while most curves still remained non-synchronous change for the observation stations farther away from the epicenter, is also presented. |
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| Keywords: | harmonic wave amplitude ratio Menyuan MS 6 4 earthquake precursory variation |
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