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2012-04-11 08:38:37UT和10:43:09UT苏门答腊地区先后发生了M8.6级和M8.2级强烈地震。本文采用震中附近地区9个IGS连续跟踪站的GPS观测数据,对两次地震的同震电离层异常现象进行了探测与分析。结果表明两次地震之后均出现了明显的同震电离层异常现象,异常出现的时间和异常的幅度与距震中的距离有关,异常的最大值约为2TECU,且震中偏北方向的异常最为显著。根据震中到穿刺点的距离,计算得出两次地震产生的大气声波的传播速度分别为0.73±0.06km/s和0.69±0.04km/s,与声波在0~450km内的平均传播速度一致。
2012-04-11 08: 38: 37UT and 10: 43: 09UT In the Sumatra region, strong earthquakes of magnitude M8.6 and M8.2 occurred successively. In this paper, the GPS observations of nine IGS continuous tracking stations in the vicinity of the epicenter are used to detect and analyze the coseismic anomalies of the two earthquakes. The results show that obvious coseismic ionospheric anomalies appear after both earthquakes, and the time of anomaly and the amplitude of anomaly are related to the distance from the epicenter. The maximum value of anomaly is about 2 TECU and the anomaly north of the epicenter is the most significant . According to the distance from the epicenter to the piercing point, the propagation velocities of the atmospheric sound waves generated by the two earthquakes are 0.73 ± 0.06km / s and 0.69 ± 0.04km / s, respectively, which are consistent with the average propagation velocities of sound waves in the range of 0 ~ 450km.