美国加利福尼亚州M6.0地震前电离层TEC异常分析
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
针对2014年8月24日世界时10∶20发生在美国加利福尼亚州地区(38.21°,-122.32°)的M 6.0地震,利用美国地区全球定位系统(GPS)双频观测台网和欧洲定轨中心(CODE)绘制的全球电离层地图(GIM),分析震前上空电离层电子浓度总含量(TEC)的时间和空间变化。结果表明,震前2 d震中附近区域TEC相对于前25 d,TEC下边界限出现明显负异常;通过对全球范围电离层TEC变化的空间分析,震前2 d震中附近区域异常减小的时间持续约40 h,且TEC减小幅度和相对变化较为明显。此次地震前电离层TEC异常减少,与以往亚洲地区地震的统计分析结果较为一致,但对北美地区地震空间前兆规律还有待于积累更多资料及分析。
On 24 August 2014, a magnitude 6.0 earthquake struck north central California near the coast. This paper first examined temporal and spatial variation of the ionospheric total electron content(TEC) observed by a network of the global positioning system receivers in the US. It was found that the TEC value significantly decreased 2 d before the earthquake around the epicenter compared with that of reference days(previous 25 d low bound or median). Further, spatial analysis of global TEC variation was performed with the global ionosphere map developed by Center for Orbit Determination in Europe. The results showed that extreme decrease of TEC from a relatively large area of the epicenter to a small area around the epicenter was up to 40 h, and the amplitude and relative variation of extreme decrease of TEC were significant. The extreme decrease of ionospheric TEC observed before the California earthquake agreed with the conclusion from the statistic analysis of earthquakes occurring in Asia. However, more data need to be accumulated to explore the spatial precursor of earthquakes in North America.
引文
[1]Barnes R S.Observation of ionospheric disturbances following theAlaska earthquake[J].Journal of Geophysical Research,1965,70(5):1250-1253.
    [2]Pulinets S A,Legenka A D,Zelenova T I.Dependence of the seismo-ionospheric variations in the F-layer maximum on the local time[J].Geomagnetism Aeronomy,1998,38(3):188-193.
    [3]Liu J Y,Chen Y I,Pulinets S A,et al.Seismo-ionosphere signaturesprior to M≥6.0 Taiwan earthquake[J].Geophysical Research Letters,2000,27(19):3113-3116.
    [4]丁鉴海,索玉成,余素荣.地磁场与电离层异常现象及其与地震的关系[J].空间科学学报,2005,25(6):536-542.Ding Jianhai,Suo Yucheng,Yu Surong.Phenomena of geomagneticand ionospheric anom alies and their relation to earthquakes[J].Chinese Journal of Space Science,2005,25(6):536-542
    [5]Liu J Y,Chen Y I,Chuo Y J,et al.Variations of ionospheric totalelectron content during the Chi-Chi earthquake[J].Geophysical ResearchLetters,2001,28(7):1383-1386.
    [6]Liu J Y,Chen Y I,Chen C H,et al.Temporal and spatial precursors inthe ionospheric global positioning system(GPS)total electron contentobserved before the 26 December 2004 M 9.3 Sumatra-Andamanearthquake[J].Journal of Geophysical Research,2010,115(A9):A09312,doi:10.1029/2010JA015313.
    [7]Liu J Y,Chen Y I,Chen C H,et al.Seismoionospheric GPS totalelectron content anomalies observed before the 12 May 2008 Mw7.9Wenchuan earthquake[J].Journal of Geophysical Research,2009,114(A4):A04320,doi:10.1029/2008JA013698.
    [8]Liu J Y,Le H J,Chen Y I,et al.Observations and simulations ofseismoionospheric GPS total electron content anomalies before the 12January 2010 M 7 Haiti earthquake[J].Journal of Geophysical Research,2011,116(A4):A04302,doi:10.1029/2010JA015704.
    [9]Liu J Y,Chen Y I,Shan S J,et al.Pre-earthquake ionosphericanomalies registered by continuous GPS TEC measurement[J].Journalof Geophysical Research,2004,22:1585-1593.
    [10]Le H J,Liu J Y,Liu L B.A statistical analysis of ionosphericanomalies before 736 M 6.0+earthquakes during 2002~2010[J].Journalof Geophysical Research,2001,116(A2):A02303,doi:10.1029/2010JA015781.
    [11]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):30-34.Zhao Biqiang,Wan Weixing,Wang min,et al.Recent advances on theionospheric pre-cursors of earquakes and ionospheric variation prior toWenchuan earthquake[J].Science&Technology Review,2008,26(11):30-34.
    [12]Yu T,Mao T,Wang Y G,et al.Study of the ionospheric anomalybefore the Wenchuan earthquake[J].Chinese Science Bulletin,2009,54(6):1086-1092.

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