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Enhancing reliability of seismo-ionospheric anomaly detection with the linear correlation between total electron content and the solar activity index F10.7: Nepal earthquake 2015

机译：通过总电子含量与太阳活动指数F10.7之间的线性关系来增强地震电离层异常检测的可靠性：尼泊尔地震2015

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摘要

There is still no consensus on seismo-ionospheric anomalies and coupling mechanism. One of important reasons is that multi- excitation factors of ionospheric disturbances interfere with the judgment of their source. In this paper, a Linear Model between TEC and F10.7 (LMTF) was built to detect seismo-ionospheric TEC anomalies before and after Nepal earthquake 2015. Firstly, LMTF and Kalman filter (KFM) were utilized to predict TEC and compare with the TEC from Global Ionosphere Map (GIM) for evaluating their prediction accuracies. The statistical results show that the mean square error (MSE), average absolute relative error ((Delta) over bar) and the correlation coefficient (Corr) between the TEC from GIM and the prediction TEC are +/- 0.88 TECU, 1.55 and 0.94 and all approximately equal to those of KMF, when their time moving windows are all set to 30 days. Further considering the period of the solar, the time moving window could be set to 27 days. Then, Sliding Quartile Method (SQM), KFM and LMTF were utilized to detect TEC anomalies above epicenter, International GNSS stations in affected area and the globe during the period of 15 days before and 10 days after Nepal earthquake by comparison. The comparative results demonstrate that LMTF is more effective to detect the TEC anomaly caused by Nepal earthquake in temporal and spatial scale. Moreover, the characteristics of the TEC anomalies caused by Nepal earthquake using LMTF are in agreement with the results of previous studies on Wenchuan and Nepal earthquake cases. At last, the coupling mechanism was discussed based on the characteristics of seismo-ionospheric TEC anomalies. It is supposed that the mechanism of seismo-ionospheric TEC anomalies can be explained by the combination action of internal gravity waves (IGWs) generated by the solar terminator and the electric field in seismogenic zone formed by the electric field effect of geochemical process and the piezo-electric potential effect of rock.
机译：关于电离层异常及其耦合机制尚无共识。重要的原因之一是电离层扰动的多种激发因素会干扰其来源的判断。本文建立了TEC和F10.7之间的线性模型（LMTF），以检测2015年尼泊尔地震前后的电离层TEC异常。首先，利用LMTF和卡尔曼滤波（KFM）预测TEC并将其与全球电离层地图（GIM）的TEC，用于评估其预测精度。统计结果表明，GIM的TEC与预测TEC之间的均方误差（MSE），平均绝对相对误差（bar之上的Δ）和相关系数（Corr）为+/- 0.88 TECU，1.55和0.94当它们的时移窗口都设置为30天时，它们都近似等于KMF。进一步考虑日照时间，可以将时间移动窗口设置为27天。然后，通过比较滑动四分位数法（SQM），KFM和LMTF来比较尼泊尔地震发生前15天和地震发生后10天期间震中，全球受灾地区和全球GNSS站上方的TEC异常。比较结果表明，LMTF在时空尺度上更有效地探测由尼泊尔地震引起的TEC异常。此外，使用LMTF的尼泊尔地震引起的TEC异常特征与先前对汶川和尼泊尔地震案例的研究结果一致。最后，根据地震电离层TEC异常的特征，对耦合机制进行了探讨。据推测，地震电离层TEC异常的机理可以通过太阳终结者产生的内部引力波（IGW）与地球化学过程的电场效应和压电作用形成的震源区电场的组合作用来解释。 -岩石的电势效应。

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  • 来源
    《Journal of geodynamics》 |2018年第11期|88-95|共8页
  • 作者

    Ke Fuyang; Wang Jinling; Tu Manhong; Wang Xinzhi; Wang Xiaoying; Zhao Xingwang; Deng Jian;

  • 作者单位

    Nanjing Univ Informat Sci & Technol, Sch Remote Sensing & Geomat Engn, Nanjing 210044, Jiangsu, Peoples R China;

    Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW 2025, Australia;

    China Meteorol Adm, Meteorol Observat Ctr, Beijing 100081, Peoples R China;

    Nanjing Univ Informat Sci & Technol, Sch Remote Sensing & Geomat Engn, Nanjing 210044, Jiangsu, Peoples R China;

    Nanjing Univ Informat Sci & Technol, Sch Remote Sensing & Geomat Engn, Nanjing 210044, Jiangsu, Peoples R China;

    Anhui Univ Sci & Technol, Sch Geodesy & Geomat, Huainan 232001, Peoples R China;

    Xiamen Univ Technol, Sch Comp & Informat Engn, Xiamen 361024, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Seismo-ionospheric; TEC anomaly; Kalman filter; Sliding quartile method; The solar activity index F10.7; Nepal earthquake;

    机译：电离层TEC异常卡尔曼滤波滑动四分位法太阳活动指数F10.7尼泊尔地震;

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