缅甸Ms7.2地震前电离层TEC的异常变化

摘要

On the basis of the Total Electron Content (TEC) obtained from International GNSS Service (IGS) and the VTEC derived from the GPS observation data from the reference stations of Crustal Movement Observational Network of China and using the method of moving average, we have processed and analyzed the ionospheric TEC prior to the Myanmar Ms7. 2 earthquake. The results show that the anomalous reduction of TEC occurred on 6 -8 day prior to the earthquake and the anomalous increase of TEC occurred on the 3rd day prior to the earthquake may be related to the geomanetic disturbance on Mar. 21. Due to the time is close to the occuring moment of the event, it can be concluded that the observed anomalous reduction of ionospheric TEC on Mar. 16, 17 and 18 and the conjugated structure of the anomalous reduction on Mar. 18 is possibly related to the earthquake excluding the effect of solar activity and geomagnetic disturbance.%基于IGS提供的电离层TEC资料和中国地壳运动观测网络提供的GPS资料解算的单站VTEC数据,采用滑动平均处理方法,对2011年3月24日缅甸7.2级地震震前的电离层TEC资料进行了处理和分析,结果表明:在震前6～8天,出现电离层TEC异常减小现象,震前3天出现电离层TEC异常增加现象,排除太阳活动和地磁扰动的影响后,3月16日、17日和18日出现的电离层TEC异常减小,特别是在18日出现的异常减小及呈现出的共轭结构,可能与缅甸7.2级地震有关.