中国西南区域孕震区电离层TEC变化长时间序列分析

doi:10.3969/j.issn.0253-4967.2014.02.021

地震地质 ›› 2014, Vol. 36 ›› Issue (1): 253-265.DOI: 10.3969/j.issn.0253-4967.2014.02.021

中国西南区域孕震区电离层TEC变化长时间序列分析

闫相相^1,2, 单新建¹, 曹晋滨³, 汤吉¹, 刘展², 王振杰²

1 中国地震局地质研究所, 地震动力学国家重点实验室, 北京 100029;
2 中国石油大学(华东), 地球科学与技术学院, 青岛 266580;
3 北京航空航天大学, 宇航学院, 北京 100191

收稿日期:2013-04-18 修回日期:2013-09-02 出版日期:2014-03-30 发布日期:2014-04-08
基金资助:
中国地震局地震行业科研专项（200708015）；国家自然科学基金（41340008）和科技部国际合作项目“CSES（中国地震电磁卫星）计划第一期研究”（2009DFA21480）共同资助

LONG TIME SERIES ANALYSIS OF IONOSPHERIC TEC DISTURBANCE OVER SEISMICALLY ACTIVE REGION IN SOUTHWEST CHINA DURING LOW SOLAR ACTIVITY

YAN Xiang-xiang^1,2, SHAN Xin-jian¹, CAO Jin-bin³, TANG Ji¹, LIU Zhan², WANG Zhen-jie²

1 State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;
2 School of Geosciences, China University of Petroleum, Qingdao 266580;
3 Beijing University of Aeronautics and Astronautics, Beijing 100191, China

Received:2013-04-18 Revised:2013-09-02 Online:2014-03-30 Published:2014-04-08

摘要/Abstract

摘要： 通过中国地壳运动网络提供的GPS观测数据，获取了高精度电离层TEC分布，采用滑动四分位法分析了中国西南区域2008年4—10月（太阳和地磁活动平静时段）6次连续的M_W6.0以上地震期间孕震区电离层TEC长时间变化及其异常分布；并在此基础上利用GIM数据对比分析了全球TEC变化特征。鉴于电离层主要受到太阳和地磁等空间天气的影响，将TEC变化与太阳EUV辐射、行星际磁场南向分量IMF Bz以及地磁活动指数D_st和K_p进行了比较。结果发现，该时段内电离层TEC异常扰动与太阳和地磁活动有很好的相关性；除汶川地震外，其他地震前没有发现明显的跟地震相关的TEC异常扰动现象。同时，对比分析了与上述研究区位于同一地磁纬度的“检验区”（30°～50°E，15°～35°N）的GPS TEC随时间变化和异常分布情况，结果显示TEC异常分布的时空特征与研究区域较为一致。由于电离层是一个复杂的系统，其扰动具有多源性，而且地震电离层扰动现象是复杂多变的，因此需要联合地基和天基手段共同观测，并加强其机理研究。

关键词: 电离层TEC, 强震, 太阳和地磁活动, 长时间序列, 中国西南地区

Abstract: Using data of Crustal Movement Observation Network of China(CMONC)we analyzed variations of total electron content(TEC)over southwest China during a period of low solar and geomagnetic activity in April-October 2008. During that time, six large earthquakes with magnitude M≥6.0 occurred around the southwest region of China. To determine the abnormal TEC signals, a quartile-based process is performed. At each time point we calculated the median M using the TEC values at the same local time for the preceding 15 days. In addition, we calculated the maps of differential TEC from global ionosphere maps(GIM)in the above period. Known that the decisive role in the ionosphere state is performed by space weather effects, we compared the TEC variations with time series of EUV solar radiation, Bz component of the interplanetary magnetic field (IMF), index of geomagnetic activity D_st and planetary index K_p, respectively. It is found that the observed anomalies in the regional TEC are in good correlation with the variations of above solar and geomagnetic activities. We have not detected obvious TEC disturbance before five earthquakes expect for Wenchuan earthquake. In order to additionally check the spatial occurrence of the observed anomalies, we chose a "check-region" with the same geomagnetic latitudes as the epicentral area of the six considered earthquakes, and analyzed the TEC changes. The result shows that the time series of anomalous TEC in "check-region" is similar to the epicentral area, which is dominated by space weather. Therefore, it indicates the difficulties in identifying earthquake precursors in the ionosphere TEC. The seismo-ionospheric coupling process is complex, and it is necessary to strengthen the observation of multi-parameters on the ground, in the atmosphere and ionosphere synchronously.

Key words: TEC(total electron content), strong earthquakes, solar and geomagnetic activities, long time series analysis

中图分类号:

P318.5

闫相相, 单新建, 曹晋滨, 汤吉, 刘展, 王振杰. 中国西南区域孕震区电离层TEC变化长时间序列分析[J]. 地震地质, 2014, 36(1): 253-265.

YAN Xiang-xiang, SHAN Xin-jian, CAO Jin-bin, TANG Ji, LIU Zhan, WANG Zhen-jie. LONG TIME SERIES ANALYSIS OF IONOSPHERIC TEC DISTURBANCE OVER SEISMICALLY ACTIVE REGION IN SOUTHWEST CHINA DURING LOW SOLAR ACTIVITY[J]. SEISMOLOGY AND GEOLOGY, 2014, 36(1): 253-265.

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中国西南区域孕震区电离层TEC变化长时间序列分析

LONG TIME SERIES ANALYSIS OF IONOSPHERIC TEC DISTURBANCE OVER SEISMICALLY ACTIVE REGION IN SOUTHWEST CHINA DURING LOW SOLAR ACTIVITY

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