汶川地震同震电离层扰动研究

地震 ›› 2017, Vol. 37 ›› Issue (2): 126-134.

汶川地震同震电离层扰动研究

何建辉¹,张学民¹,林剑²,王敏¹,申旭辉³

1.中国地震局地震预测研究所, 北京 100036;
2中国地震局地震研究所, 武汉 130071;
3.中国地震局地壳应力研究所, 北京 100085

收稿日期:2016-06-30 出版日期:2017-04-20 发布日期:2019-08-14
作者简介:何建辉(1992-), 男, 河南信阳人, 在读硕士研究生, 主要从事GNSS数据处理和电离层建模研究。
基金资助:
国际科技合作项目(2014DFR21280, APSCO-2014, ISSI-BJ-2015IT10, IAA-SG1.14); 中央级公益性科研院所基本科研业务专项(2015IES0101)

Coseismic Ionosphere Disturbances of the 2008 Wenchuan Earthquake

HE Jian-hui¹,ZHANG Xue-min¹,LIN Jian²,WANG Min¹,SHEN Xu-hui³

1.Institute of Earthquake Science, CEA, Beijing 100036, China;
2.Institute of Earthquake, CEA, Wuhan 130071, China;
3.Institute of Crustal Dynamics, CEA, Beijing 100085, China

Received:2016-06-30 Online:2017-04-20 Published:2019-08-14

摘要/Abstract

摘要： 利用中国大陆陆态观测网(CMONOC)的下关、昆明和庐州GPS台站, 对汶川地震引起的同震电离层扰动(CID)进行研究。通过对GPS原始观测数据进行处理证实汶川地震存在5个明显的同震电离层扰动(CID)现象。根据GPS TEC时间序列和走时, 得到在电离层高度CID的水平传播速度为1.1 km/s, 属于震中区地表抬升引起的声波在电离层中传播速度; 同时, 也得到次一级CID传播速度接近0.7 km/s, 认为可能是重力波。在此基础上, 利用射线追踪模型寻找震中位置发现, 当CID水平传播速度为1000 m/s时, 发震时刻对应的标准偏差能达到最小值19.55 s, 相应的CID起源位置是30.8°N, 103.15°E, 距离实际震中西南方向33.6 km。

关键词: GPS TEC, 电离层扰动, 传播速度, 声重波, 2008年汶川地震

Abstract: We use three ground GPS receiver stations at Xiaguan, Kunming and Luzhou in the CMONOC to study coseismic ionospheric disturbance (CID) for the 2008 Wenchuan earthquake. We retrieve high precise slant total electron content (STEC) through removing the DCB (Difference Code Bias) effect in the line of sight of GPS. Through preproccess of the GPS data and the STEC, we obtained the DTEC time series and the TEC traveling time plots among them. The results show that there exists two CID horizontal propagation speeds in this research. The first is the acoustic speed in the height of ionosphere, about 1.1 km/s, and the second is the secondary CID speed closed to 0.7 km/s, considered to belong to the gravity wave. Finally, using the ray-tracing technique, when the CID speed equals to the 1000 m/s, the standard deviation of the earthquake onset time can reach the minimum value 19.55s, and the origin of the CID is located at 30.8°N,103.15°E which is about 33.6 km southwest of the Wenchuan earthquake epicenter.

Key words: GPS TEC, Coseismic ionospheric disturbance, Propagating velocity, Acoustic gravity wave, The 2008 Wenchuan earthquake

中图分类号:

P315.7

何建辉,张学民,林剑,王敏,申旭辉. 汶川地震同震电离层扰动研究[J]. 地震, 2017, 37(2): 126-134.

HE Jian-hui,ZHANG Xue-min,LIN Jian,WANG Min,SHEN Xu-hui. Coseismic Ionosphere Disturbances of the 2008 Wenchuan Earthquake[J]. EARTHQUAKE, 2017, 37(2): 126-134.

参考文献

[1] Davies K. Ionospheric radio[M]. Peter Peregrinus on behalf of the Institution of Electrical Engineers, 1990.
[2] Heki K, Ping J. Directivity and apparent velocity of the coseismic ionospheric disturbances observed with a dense GPS array[J]. Earth & Planetary Science Letters, 2005, 236(3): 845-855.
[3] Davies K, Baker D M. Ionospheric effects observed around the time of the Alaskan earthquake of March 28, 1964[J]. Journal of Geophysical Research Atmospheres, 1965, 70(9): 2251-2253.
[4] Yuen P C, Weaver P F, Suzuki R K, et al. Continuous, Traveling Coupling between Seismic Waves and the Ionosphere Evident in May 1967 Japan Earthquake Data[J]. Journal of Geophysical Research Atmospheres, 1969, 74(9): 2256-2264.
[5] Occhipinti G, Dorey P, Farges T, et al. Nostradamus: The radar that wanted to be a seismometer[J]. Geophysical Research Letters, 2010, 37(18): 1480-1493.
[6] Liu J Y, Tsai Y B, Chen S W, et al. Giant ionospheric disturbances excited by the M9.3 Sumatra earthquake of 26 December 2004[J]. Geophysical Research Letters, 2006, 33(2): 356-360.
[7] Afraimovich E L, Perevalova N P, Plotnikov A V, et al. The shock-acoustic waves generated by earthquakes[J]. Annales Geophysicae, 2001, 19(4): 395-409.
[8] Liu J Y, Tsai Y B, Ma K F, et al.Ionospheric GPS total electron content (TEC) disturbances triggered by the 26 December 2004 Indian Ocean tsunami[J]. Journal of Geophysical Research, 2006, 111: A05303.
[9] Liu J Y, Tsai H F, Lin C H, et al. Coseismic ionospheric disturbances triggered by the Chi‐Chi earthquake[J]. Journal of Geophysical Research Atmospheres, 2010, 115(A8), doi:10.1029/2009JA014943.
[10] Calais E, Minster J B, Hofton M, et al. Ionospheric signature of surface mine blasts from Global Positioning System measurements[J]. Geophysical Journal International, 1998, 132(1): 191-202.
[11] Lay, Thorne. Modern global seismology[M].Academic Press, 1995.
[12] Stewart, S. W. Principles and applications of microearthquake networks[M]. Academic Press, 1981.
[13] 王卫民, 赵连锋, 李娟, 等. 四川汶川8.0级地震震源过程[J]. 地球物理学报, 2008, 51(5): 1403-1410.
[14] 林剑, 吴云, 熊晶, 等. LEO GPS接收机仪器偏差估计[J]. 地球物理学报, 2010, 53(5): 1034-1038.
[15] 蔡华, 李子申, 王敏, 等. 汶川M_W7.9与日本M_W9.0地震同震电离层扰动研究[J]. 武汉大学学报(信息科学版), 2013, 38(6): 716-719.
[16] Huang B S, Chen K C, Yen H Y, et al. Re-Examination of the Epicenter of the 16 September 1994 Taiwan Strait Earthquake Using the Beam-Forming Method[J]. Terrestrial Atmospheric & Oceanic Sciences, 1999, 10(3): 529-542.
[17] Astafyeva E, Heki K, Kiryushkin V, et al. Two-mode long-distance propagation of coseismic ionosphere disturbances[J]. Journal of Geophysical Research Space Physics, 2009, 114(A10): 971-978.
[18] Zhao B, Hao Y.Ionospheric and geomagnetic disturbances caused by the 2008 Wenchuan earthquake: A revisit[J].Journal of Geophysical Research, 2015, 120(7), doi:10.1002/2015JA021035.
[19] Liu J Y, Sun Y Y, Tsai H F, et al. Seismo-Traveling Ionospheric Disturbances Triggered by the 12 May 2008 M8.0 Wenchuan Earthquake[J]. Terrestrial Atmospheric & Oceanic Sciences, 2012, 23(1): 9-15.
[20] Alken P, Maus S, Emmert J, et al. Improved horizontal wind model HWM07 enables estimation of equatorial ionospheric electric fields from satellite magnetic measurements[J]. Geophysical Research Letters, 2008, 35(35): 213-226.