Virtual array beamforming of GPS TEC observations of coseismic ionospheric disturbances near the Geomagnetic South Pole triggered by teleseismic megathrusts

Autor:	Dana J. Caccamise, S. Cimbaro, Ian W. D. Dalziel, Michael Bevis, Robert Smalley, Terry J. Wilson, Diego A. Piñón, S. A. Konfal, Eric Kendrick, Michael J. Willis, Charles A. Langston, D. Gomez
Rok vydání:	2015
Předmět:	Beamforming Total electron content business.industry TEC Acoustic wave Geodesy Physics::Geophysics symbols.namesake Geophysics Earth's magnetic field Space and Planetary Science Physics::Space Physics symbols Global Positioning System Rayleigh wave Ionosphere business Seismology Geology
Zdroj:	Journal of Geophysical Research: Space Physics. 120:9087-9101
ISSN:	2169-9402 2169-9380
DOI:	10.1002/2015ja021725
Popis:	We identified co-seismic ionospheric disturbances (CID) in Antarctica generated by the 2010 Maule and the 2011 Tohoku-Oki earthquakes analyzing 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::65aaf86491925e72b40f0fca441f54ca https://doi.org/10.1002/2015ja021725 Zobrazit plný text záznamu Plný text