2018年8月5日印度尼西亚地震震前电离层异常特征

王壮凯; 刘祎; 刘静; 张学民; 周晨

doi:10.11939/jass.20190134

2018年8月5日印度尼西亚地震震前电离层异常特征

王壮凯¹,
刘祎¹,
刘静²,
张学民²,
周晨^1, ,

1.
中国武汉 430072 武汉大学电子信息学院
2.
中国北京 100036 中国地震局地震预测研究所

基金项目: 国家重点研发计划（2018YFC1503506）资助

详细信息

通讯作者:
周晨: e-mail：chenzhou@whu.edu.cn

中图分类号: P315.7，P352
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出版历程
- 收稿日期: 2019-07-30
- 修回日期: 2019-11-01
- 网络出版日期: 2020-08-16
- 发布日期: 2020-07-20

Characteristics of ionospheric anomalies before the earthquake in Indonesia on August 5，2018

1.
School of Electronic Information， Wuhan University， Wuhan 430072， China
2.
Institute of Earthquake Forecasting， China Earthquake Administration， Beijing 100036， China

摘要

摘要: 基于2018年8月5日印度尼西亚地震震中（116.45°E，8.33°S）附近的澳大利亚达尔文站和位于震中磁力线共轭区域的武汉站的电离层测高仪观测数据，以及相同区域全球卫星导航系统接收机的观测数据，对该地震震前的电离层异常扰动特征进行了分析。结果显示，震前同时观测到了电离层F₂层临界频率（f_oF2）和总电子含量（TEC）时间序列的异常。基于岩石圈-大气层-电离层直流电场耦合模式和美国国家大气研究中心的热层-电离层环流耦合模式（NCAR/HAO TIEGCM）对震前震中及其对应磁力线共轭点区域的电子密度异常进行了模拟，模拟结果表明，在地震异常电场的作用下，地震区域及其对应半球的磁共轭区域的TEC和电离层F₂层峰值电子密度N_mF2发生了明显扰动。
- 岩石圈-大气层-电离层耦合 /
- f_oF2 /
- TEC /
- TIEGCM模拟
Abstract: Based on the observations of the ionosondes at the Darwin station in Australia near the epicenter （116.45°E, 8.33°S） of the earthquake in Indonesia on August 5, 2018 and at the Wuhan station in the magnetically conjugated area of the epicenter, and the observations of the GNSS receiver in the corresponding regions, this paper analyzed the characteristics and the mechanism of the ionospheric anomaly disturbance. The results show that both the critical frequency （ f_oF2） and time series of the ionospheric total electron content （TEC） were observed to be abnormal before the earthquake. Based on the lithosphere-atmosphere-ionosphere DC electric field coupling model and thermosphere-ionosphere-electrodynamics general circulation model （TIEGCM） from the National Center for Atmospheric Research （NCAR/HAO）, the electron density anomalies of the seismic area and the magnetically conjugated area before the earthquake are simulated. The simulation results show that TEC and maximum electron density N_mF2 of the seismic area and the magnetically conjugated area are significantly disturbed by the abnormal electric field before the earthquake.
- lithosphere-atmosphere-ionosphere coupling /
- f_oF2 /
- TEC /
- TIEGCM simulation

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图 1 印度尼西亚地震震中、磁共轭点、电离层测高仪站、IGS站的地理位置分布

Figure 1. Geographic locations of Indonesia earthquake epicenter，magnetically conjugated point，ionosondes and IGS stations

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图 2 2018年7月1日到8月12日D_st指数（a），K_p指数（b）和F_10.7 （c）的变化

Figure 2. Variation of the indices D_st（a），K_p（b） and F_10.7 （c） from July 1 to August 12，2018

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图 3 2018年8月3日至9日武汉站和达尔文站的f_oF2观测变化

（a） f_oF2原始数据；（b） f_oF2标准差

Figure 3. The variations of f_oF2 observed by Wuhan station and Darwin station from August 3 to 9，2018

（a） Original data of f_oF2；（b） Standrad deviation of f_oF2

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图 4 2018年8月3日至9日武汉站和达尔文站的f_oF2异常扰动观测

红色、绿色曲线分别表示原始f_oF2数据减去月中值、月均值后再减去两倍标准差的结果，蓝色方框为武汉站和达尔文站的f_oF2同时呈现异常的时间点

Figure 4. The abnormal disturbances of f_oF2 observed by the stations Wuhan and Darwin from August 3 to 9，2018

The red curve indicates the result that the original f_oF2 data minuses the 31-day median and then subtracts twice the standard deviation. The green curve indicates the result that the original f_oF2 data minuses the 31-day mean and then subtracts twice the standard deviation. The blue box indicates the time point at which the f_oF2 in Wuhan and Darwin stations are simultaneously anomalous

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图 5 30号卫星观测到各站点的δTEC序列

Figure 5. The δTEC sequences from different stations observed by the satellite No.30

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图 6 30号卫星观测到的13个站点的IPP分布

Figure 6. IPP distribution of 13 sites observed by the satellite No.30

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图 7 地震区域2018年8月4日（年积日216） UTC 03:40电离层底部z＝90 km处的异常水平电场分布

（a）总电场强度E；（b）磁南北向电场强度E_SN；（c）磁东西向电场强度E_EW

Figure 7. Distribution of the abnormal horizontal electric ﬁeld at UTC 03:40 on August 4，2018（216 day of the year） at the bottom of the ionosphere （z＝90 km）

（a） Total electric field intensity E；（b） The electric field intensity E_SN in magnetic north-south direction；（c） The electric field intensity E_EW in magnetic east-west direction

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图 8 基于TIEGCM模型对插入异常电场四小时后地震及磁共轭区域TEC情况的模拟结果

Figure 8. Simulation results of TEC evolution in the seismically active area and magnetically conjugated area four hours after insertion of an abnormal electric field based on the model TIEGCM

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图 9 基于TIEGCM模型对插入异常电场四小时后地震及磁共轭区域N_mF2情况的模拟结果

Figure 9. Simulation results of N_mF2 evolution in the seismically active area and magnetically conjugated area four hours after insertion of an abnormal electric field based on the model TIEGCM

下载: 全尺寸图片幻灯片

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