汶川8级地震前的空间电离层异常现象

基于四川汶川8级地震前震中上空DEMETER卫星记录VLF电场频谱数据,利用重访轨道分析了固定纬度点记录的VLF电场信号的背景频谱变化,发现每年的1～6月各频谱变化比较稳定,人工源VLF信号与其他频谱值的幅度相比也清晰可辨,但7～10月扰动比较剧烈,存在整体抬升上升或者快速下降现象,而且人工源VLF信号比较模糊,难以识别.     

Ionospheric Ne disturbances before 2007 Pu’er,Yunnan, China,earthquake

Selecting three half orbits near the epicenter of Pu’er earthquake, we analyzed the Ne data recorded in their revis-ited orbits during a year before this earthquake, and extracted Ne precursors. The results show that: ① There are significant seasonal variations of ionospheric Ne in night time, which exhibit different shapes respectively in four seasons; ② There are three main shapes of Ne: single-peak, saddle-shaped and even-shaped, all of which may oc-cur in four seasons, but each season with its typical shape relatively; ③ Spatial images of Ne showed high values near the epicenter in 30 days before the earthquake, and there is a good correlation between anomaly and distribu-tion of earthquake in space and time, which reflects that these spatial anomalies were indeed concerned with the earthquake; ④There shows a certain similarity of the Ne curves among revisited orbits, which can provide back-ground information for distinguishing and identification of seismic anomaly.     

Ionospheric Ne disturbances before 2007 Pu’er, Yunnan, China, earthquake

Selecting three half orbits near the epicenter of Pu'er earthquake, we analyzed the Ne data recorded in their revis-ited orbits during a year before this earthquake, and extracted Ne precursors. The results show that: ① There are significant seasonal variations of ionospheric Ne in night time, which exhibit different shapes respectively in four seasons; ② There are three main shapes of Ne: single-peak, saddle-shaped and even-shaped, all of which may oc-cur in four seasons, but each season with its typical s...