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

Dependence of waveform of near-field coseismic ionospheric disturbances on focal mechanisms
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DOI:
10.1186/bf03353206
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发表时间:
2009-01-01
影响因子:
3
通讯作者:
Heki, Kosuke
Heki, Kosuke
中科院分区:
地球科学3区
文献类型:
--
作者:
Astafyeva, Elvira;Heki, Kosuke

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利用全球定位系统的总电子含量(TEC)测量,研究了1994年10月4日、2006年11月15日和2007年1月13日在千岛弧区发生的三次大地震的电离层响应。这些地震具有不同的震源机制,即高角度反转、低角度反转和正断层运动。技术咨询委员会对2006年和2007年事件的反应分别是积极的和消极的变化。另一方面,1994年地震的初始TEC变化随震源区周围方位角的不同而呈现正负两极变化。这种变化可能反映了同震地壳垂直位移的差异,在2006年和2007年事件中,地壳垂直位移分别以隆升和下沉为主,但在1994年事件中都包括在内。
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.