2012年4月11日苏门答腊M_S8.6地震前电离层TEC异常变化
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摘要
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。
A strong earthquake of magnitude 8.6 occurred near the west coast of Northern Sumatra,Indonesia,at 08:38:36.5 UT on 11 April 2012 as a result of strike-slip faulting within the oceanic lithosphere of the Indo-Australia plate.Its epicenter was located at geographic latitude02.31°N and longitude 93.06°E with depth of about 20.0 km.In this paper,on the basis of the Global Ionospheric Maps(GIMs) of Total Electron Content(TEC) provided by the International GNSS Service(IGS) network,we process and analyze the ionospheric TEC data prior to the Sumatra M_S8.6 earthquake by the method of the statical analysis,the results showed that ionospheric TEC anomalies include both anomalous increase and anomalous reduction a few days prior to the earthquake,the apparent anomalous increase of TEC occurred at 12:00-16:00 LT on April 5 which lasted for about four hours,due to the time was close to the moment when the earthquake occurred,it can be concluded the observed anomalous variations of the ionospheric TEC on April 5 is possibly related to the earthquake exclude the effect of solar activity and geomagnetic conditions.
A strong earthquake of magnitude 8.6 occurred near the west coast of Northern Sumatra,Indonesia,at 08:38:36.5 UT on 11 April 2012 as a result of strike-slip faulting within the oceanic lithosphere of the Indo-Australia plate.Its epicenter was located at geographic latitude02.31°N and longitude 93.06°E with depth of about 20.0 km.In this paper,on the basis of the Global Ionospheric Maps(GIMs) of Total Electron Content(TEC) provided by the International GNSS Service(IGS) network,we process and analyze the ionospheric TEC data prior to the Sumatra M_S8.6 earthquake by the method of the statical analysis,the results showed that ionospheric TEC anomalies include both anomalous increase and anomalous reduction a few days prior to the earthquake,the apparent anomalous increase of TEC occurred at 12:00-16:00 LT on April 5 which lasted for about four hours,due to the time was close to the moment when the earthquake occurred,it can be concluded the observed anomalous variations of the ionospheric TEC on April 5 is possibly related to the earthquake exclude the effect of solar activity and geomagnetic conditions.
引文
林剑,吴云,祝芙英,等.基于GPS探测汶川地震电离层TEC的异常[J].地球物理学报,2009,52(1):297-300.
吴云,乔学军,周义炎.利用地基GPS探测震前电离层TEC异常[J].大地测量与地球动力学,2005,25(2):36-40.
熊晶,吴云,周义炎,等.2008年汶川地震前电离层异常研究[J].大地测量与地球动力学,2011,31(2):28-31
杨剑,吴云,周义炎.利用GPS无线电掩星数据研究震前电离层异常[J].大地测量与地球动力学,2008,28(1):16-22.
赵必强,万卫星,王敏,等.震前电离层扰动研究进展及汶川地震前电离层变化[J].科技导报,2008,26(11):30-33.
祝芙英,吴云,林剑,等.汶川地震前电离层VTEC的异常响应[J].地震学报,2009,31(2):180-187.
卓裕荣.电离层地震前兆之研究[D].中国台湾:国立中央大学太空科学研究所,2002:31-33.
吴云,乔学军,周义炎.利用地基GPS探测震前电离层TEC异常[J].大地测量与地球动力学,2005,25(2):36-40.
熊晶,吴云,周义炎,等.2008年汶川地震前电离层异常研究[J].大地测量与地球动力学,2011,31(2):28-31
杨剑,吴云,周义炎.利用GPS无线电掩星数据研究震前电离层异常[J].大地测量与地球动力学,2008,28(1):16-22.
赵必强,万卫星,王敏,等.震前电离层扰动研究进展及汶川地震前电离层变化[J].科技导报,2008,26(11):30-33.
祝芙英,吴云,林剑,等.汶川地震前电离层VTEC的异常响应[J].地震学报,2009,31(2):180-187.
卓裕荣.电离层地震前兆之研究[D].中国台湾:国立中央大学太空科学研究所,2002:31-33.
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