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基于IGS提供的GPS TEC资料和中国地壳运动观测网络提供的GPS数据解算的单站VTEC数据,采用统计分析处理方法,对2012年4月11日苏门答腊北部M_S8.6地震震前电离层TEC资料进行处理分析,结果表明:在震前5—6天以及地震当天,震中上空附近出现显著的电离层TEC异常扰动,异常形态有正有负,表现为先异常减小后异常增大最后变小,异常增大主要发生在下午至黄昏时段,即12:00-16:00 LT,持续时间约4小时。排除太阳活动和地磁扰动的影响后,4月5日出现的电离层TEC异常增大及呈现出共轭结构以及地震当天出现的异常扰动,可能与此次地震有关。
Based on the GPS TEC data provided by IGS and the single-station VTEC data calculated by the GPS data provided by China Crustal Movement Observation Network, statistical analysis and processing methods were used to analyze the TEC data before the M_S8.6 earthquake in northern Sumatra on April 11, 2012 The results show that there are significant perturbations of TEC in the epicenter above the epicenter 5-6 days before the earthquake and on the day of the earthquake. There are positive and negative anomalies in the anomalies, which show that the anomaly increases first and then decreases , The abnormal increase occurred mainly in the afternoon to evening, that is 12: 00-16: 00 LT, duration of about 4 hours. Excluding the influence of solar activity and geomagnetic disturbance, the TEC on April 5 showed anomalous increase and showed a conjugate structure as well as anomalous disturbance on the day of the earthquake, which may be related to the earthquake.