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

• DOI: 10.1186/bf03353206
• Publication Date: 2014-08-15T03:41:30Z
• Authors: Elvira Astafyeva; Kosuke Heki
• Keywords: Focal mechanism

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 have different focal mechanisms, i.e. high-angle reverse, low-angle normal faulting, respectively. TEC 2006 2007 events initiated positive negative changes, On other hand, initial changes 1994 earthquake showed both polarities depending azimuth around area. Such a variety may reflect differences coseismic vertical crustal displacements, which are dominated by uplift subsidence events, respectively, but included event.