【作者】 赵必强； 万卫星； 王敏； 刘立波； 宁百齐；

【Author】 ZHAO Biqiang,WAN Weixing,WANG Min, LIU Libo,NING Baiqi Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China

【机构】 中国科学院地质与地球物理研究所；

【摘要】 介绍了近年来国内外对震前电离层异常扰动研究进展大量新的观测证据显示地震活动前的电离层扰动确实存在而且在震级大于5级的地震发生前几天到几个小时内的孕震区上空会发生显著电离层扰动。针对2008年5月12日发生的里氏8.0级汶川大地震事件通过利用漠河北京武汉和三亚的地基GPS测量获得的垂直电子总含量（VTEC）数据北京地面测高仪测量的F₂层临界频率和Es临界频率等参量,考察中国上空电离层在地震前的变化情况,发现地震前1～6 d中,5月6-7,10-11日,白天电子浓度比5月1-5日的值偏低但f₀Es增强。5月9日日落后中低纬电子浓度出现异常增强而这段时间地磁活动平静探求这些异常变化的机制则需收集更多资料做进一步的研究。更多还原

【Abstract】 This paper first reports the recent progress in the investigation of ionospheric precursor of earthquake,which indicates that ionospheric disturbance do appear few days or hours prior to earthquake.Then,the ionospheric parameters such as Total Electron content（TEC） derived from four GPS receivers at Mohe,Beijing, Wuhan and Sanya,F₂ and Es layer critical frequency（f₀F₂ and f₀Es） observed from the Beijing ground ionosonde were used to examine the ionospheric variation before the Wenchuan M8.0 earthquake. Results show that 1～6 days before the earthquake during May 6th- 7th,10th-11th,daytime value of electron content was generally lower than that during May 1st -5th,while f₀Es was enhanced.In comparison,the TEC and f₀F₂ experienced a significant increase on May 9th around sunset sector while the geomagnetic activity was low.It is still unknown whether these ionospheric disturbances were related to the earthquake or not.Further study is needed to explore the mechanisms of these ionospheric anomalous disturbances.更多还原