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首页> 外文期刊>International journal of remote sensing >Analysis of space- and ground-based parameters prior to an earthquake on 12 December 2009
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Analysis of space- and ground-based parameters prior to an earthquake on 12 December 2009

机译：2009年12月12日地震前的空间和地面参数分析

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摘要

The present study includes observations of anomalies at ionospheric and ground levels using data from global positioning system (GPS)-based total electron content (TEC), ionospheric electron density by Detection of Electromagnetic Emissions Transmitted from Earthquake Regions (DEMETER), and ground-based ultra-low-frequency (ULF) emission prior to an earthquake that occurred on 12 December 2009. The analysis of the data from these three different techniques show relations with preseismic activities. The GPS-based TEC showed enhancement three days prior to the day of the earthquake. On converting the satellite azimuth into latitude and longitude, a large number of passes giving anomalous TEC values were observed covering a zone 17-23° N and 70-74° E (i.e. around the epicentre). Electron density and temperature as measured by DEMETER also show enhancement of the tracks around the epicentre one day prior to the earthquake. For ground-based ULF emission, we used different analysis techniques for the detection of abnormal changes in ULF emission before the earthquake. We observed changes in different parameters such as polarization ratio and fractal dimension. Clear enhancement is observed for polarization parameters (Z/X, Z/Y) and fractal analysis (for the Z component). The results provide useful information in acquiring data prior to earthquakes.
机译：本研究包括使用基于全球定位系统（GPS）的总电子含量（TEC），通过检测地震区域传输的电磁辐射（DEMETER）的电离层电子密度和基于地面的电离层和地面观测异常2009年12月12日发生地震之前的超低频（ULF）发射。对这三种不同技术的数据进行的分析表明，它们与地震活动有关。基于GPS的TEC在地震发生前三天显示出增强作用。在将卫星方位角转换为纬度和经度时，在北纬17-23°和东经70-74°（即震中附近）观察到了大量的TEC值异常。用DEMETER测量的电子密度和温度在地震发生前一天也显示出震中周围轨道的增强。对于地面ULF排放，我们使用了不同的分析技术来检测地震前ULF排放的异常变化。我们观察到了不同参数的变化，例如极化率和分形维数。对于偏振参数（Z / X，Z / Y）和分形分析（对于Z分量），观察到明显的增强。结果为地震前的数据采集提供了有用的信息。

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  • 来源
    《International journal of remote sensing》 |2013年第22期|7779-7795|共17页
  • 作者

    Sheetal Karia; Shivalika Sarkar; Kamlesh Pathak; Ashok Kumar Sharma; Haridas Ranganath; Ashok Kumar Gwal;

  • 作者单位

    Applied Physics Department, S.V. National Institute of Technology, Surat 395007, India;

    Department of Physics, Barkatullah University, Bhopal 462026, India;

    Applied Physics Department, S.V. National Institute of Technology, Surat 395007, India;

    Department of Physics,Shivaji University, Kolhapur 416004, India;

    Department of Physics,Shivaji University, Kolhapur 416004, India;

    Department of Physics, Barkatullah University, Bhopal 462026, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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