2019长宁发生MS 6.0地震，利用CODE全球电离层格网数据、中国地壳运动观测网络GPS数据、震中区域GPS数据，分别计算全球、中国区域垂直电子总含量（VTEC）异常分布及震中区域站点VTEC时间序列，揭示此次地震发生前后不同空间尺度电离层异常扰动变化。结果表明：地震发生前3天（6月14日），长宁震区上空出现连续电离层异常扰动现象，异常空间分布呈现向磁赤道偏移趋势。VTEC结果的时、空尺度变化反映，本次电离层扰动可能与长宁地震孕震过程有关，可为川滇区域临震电离层异常扰动监测及地震分析预报提供震例依据。
An MS 6.0 earthquake occurred in Changning in 2019. Utilizing the CODE global ionospheric grid data, GPS data of China crustal movement observation network and GPS data in the epicentral region, we calculated the global and Chinese vertical total electron content (VTEC) abnormal distribution and the VTEC time series of sites near the epicenter, and revealed the variation of ionospheric anomalies in different spatial scales before and after the earthquake. The results showed that the continuous ionospheric disturbances appeared over the Changning earthquake area three days before the earthquake (June 14), and the spatial distribution of the anomalies showed a trend of moving towards the magnetic equator. The time-space scale variation of VTEC results reflected that the abnormal ionospheric disturbances may be related to the seismogenic process of the Changning earthquake, which could provide a case basis for the monitoring of abnormal ionospheric disturbances and earthquake prediction in Sichuan-Yunnan region.
2020,41(2): 90-98 收稿日期：2019-09-16
DOI：10.3969/j.issn.1003-3246.2020.02.010
基金项目：四川省地震局科技专项（项目编号：LY1907）；四川省地震局“川滇区域GNSS大地构造物理及壳幔动力研究”创新团队项目（项目编号：201803）
作者简介：刘江(1982-),男,主要从事电离层数据解算分析工作。E-mail:22388116@qq.com
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