2012-04-11苏门答腊地震同震电离层异常研究
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
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。
April 11,2012 08:38:37UT and 10:43:09UT,M8.6and M8.2earthquakes occurred in Sumatra area.Using GPS data,nine IGS continuous tracking stations near the epicenter,the coseismic ionospheric disturbance after two earthquakes were detected and analysed.The results showed that after these two earthquakes,significant coseismic ionospheric anomalies were evident;the occurrence time and amplitude of anomalies were related to the distance from the epicenter;that the maximum anomaly was approximately 2TECU;and the most significant anomalies were in the northern direction.The calculated propagation velocity of sound waves generated by the two earthquakes were0.73±0.06km/s and 0.69±0.04km/s;which was consistent with the average propagation of acoustic velocity within 0~450km.
引文
[1]Calais E,Minster J B.GPS Detection of Ionospheric Perturbations Following the January 17,1994,Northridge Earthquake[J].Geophys Res Lett,1995:22(9):1 045-1 048
    [2]Heki K,Ping J.Directivity and Apparent Velocity of the Coseismic Ionospheric Disturbances Observed with a Dense GPS Array[J].Earth and Planetary Science Letters,2005,236(3):845-855
    [3]Rolland L M,LognonnéP,Astafyeva E,et al.The Resonant Response of the Ionosphere Imaged After the 2011off the Pacific Coast of Tohoku Earthquake[J].Earth,Planets and Space,2011,63(7):853-857
    [4]Choosakul N,Saito A,Iyemori T,et al.Excitation of 4-min Periodic Ionospheric Variations Following the Great Sumatra-Andaman Earthquake in 2004[J].J Geophys Res,2009,114,A10313
    [5]Astafyeva E,Heki K,Kiryushkin V,et al.TwoMode Long-Distance Propagation of Coseimic Ionosphere Disturbances[J].J Geophys Res,2009,114,A10307
    [6]Liu J Y,Tsai H F,Lin C H,et al.Coseismic Ionospheric Disturbances Triggered by the Chi-Chi Earthquake[J].J Geophys Res,2010,115:A08303
    [7]Saito A,Tsugawa T,Otsuka Y,et al.Acoustic Resonance and Plasma Depletion Detected by GPS Total Electron Content Observation After the 2011off the Pacific Coast of Tohoku Earthquake[J].Earth,Planets and Space,2011,63(7):863-867
    [8]Tsugawa T,Saito A,Otsuka Y,et al.IonosphericDisturbances Detected by GPS Total Electron Content Observation After the 2011off the Pacific Coast of Tohoku Earthquake[J].Earth,Planets and Space,2011,63(7):875-879
    [9]Cahyadi M N,Heki K.Ionospheric Disturbances of the 2007Bengkulu and the 2005Nias Earthquakes,Sumatra,Observed with a Regional GPS Network[J].J Geophys Res,2013,118:1 675-1 681
    [10]Astafyeva E,Shalimov S,Olshanshaya E,et al.Ionospheric Response to Earthquakes of Different Magnitudes:Larger Quakes Perturb the Ionosphere Stronger and Longer[J].Geophys Res Lett,2013(40):1-7
    [11]蔡华,李子申,王敏,等.汶川Mw7.9与日本Mw9.0地震同震电离层扰动研究[J].武汉大学学报·信息科学版,2013,06:716-719(Cai Hua,Li Zishen,Wang Min,et al.Coseismic Ionospheric Disturbances of Mw7.9 Wenchuan Earthquake and Mw9.0Japan Earthquake[J].Geomatics and Information Science of Wuhan University,2013,38(6):716-719)
    [12]Schaer S.Mapping and Predicting the Earth’s Ionosphere Using the Global Positioning System[D].Switzerland:Bern University,1999

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心