Premium
Virtual array beamforming of GPS TEC observations of coseismic ionospheric disturbances near the Geomagnetic South Pole triggered by teleseismic megathrusts
Author(s) -
Gómez Demián,
Smalley Robert,
Langston Charles A.,
Wilson Terry J.,
Bevis Michael,
Dalziel Ian W. D.,
Kendrick Eric C.,
Konfal Stephanie A.,
Willis Michael J.,
Piñón Diego A.,
Cimbaro Sergio R.,
Caccamise Dana
Publication year - 2015
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2015ja021725
Subject(s) - tec , geology , total electron content , geodesy , ionosphere , earth's magnetic field , global positioning system , seismology , azimuth , waveform , beamforming , geophysics , physics , telecommunications , computer science , radar , quantum mechanics , magnetic field , astronomy
We identified coseismic ionospheric disturbances (CID) in Antarctica generated by the 2010 Maule and the 2011 Tohoku‐Oki earthquakes analyzing total electron content (TEC) data with a modified beamforming technique. Beamforming in Antarctica, however, is not straightforward due to the effects of array deformation and atmospheric neutral wave‐ionospheric plasma coupling. We take these effects into account and present a method to invert for the seismically generated acoustic wave using TEC observations. The back azimuths, speeds, and waveforms obtained by the beamform are in excellent agreement with the hypothesis that the TEC signals are generated by the passage of Rayleigh waves from the Maule and Tohoku‐Oki earthquakes. The Tohoku‐Oki earthquake is ~12,500 km from Antarctica, making this the farthest observation of CIDs to date using GPS.