文章基本信息

标题：Dependence of waveform of near-field coseismic ionospheric disturbances on focal mechanisms
其他标题：Dependence of waveform of near-field coseismic ionospheric disturbances on focal mechanisms
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作者：Elvira Astafyeva ; Kosuke Heki
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2009
卷号：61
期号：7
页码：939-943
DOI：10.1186/BF03353206
出版社：Springer Verlag
摘要：Using Total Electron Content (TEC) measurements with Global Positioning System we studied ionospheric responses to three large earthquakes that occurred in the Kuril Arc on 04 October 1994, 15 November 2006, and 13 January 2007. These earthquakes have different focal mechanisms, i.e. high-angle reverse, low-angle reverse, and normal faulting, respectively. TEC responses to the 2006 and 2007 events initiated with positive and negative changes, respectively. On the other hand, the initial TEC changes in the 1994 earthquake showed both positive and negative polarities depending on the azimuth around the focal area. Such a variety may reflect differences in coseismic vertical crustal displacements, which are dominated by uplift and subsidence in the 2006 and 2007 events, respectively, but included both in the 1994 event.
关键词：Coseismic ionosphere disturbances ;TEC ;GPS ;earthquakes ;focal mechanism