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Dependence of waveform of near-field coseismic ionospheric disturbances on focal mechanisms

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Title: Dependence of waveform of near-field coseismic ionospheric disturbances on focal mechanisms
Authors: Astafyeva, Elvira Browse this author
Heki, Kosuke Browse this author →KAKEN DB
Keywords: Coseismic ionosphere disturbances
focal mechanism
Issue Date: 1-Jul-2009
Publisher: Terra Scientific Publishing Company
Journal Title: Earth, Planets and Space
Volume: 61
Issue: 7
Start Page: 939
End Page: 943
Abstract: 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.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 日置 幸介

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