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Observing tsunamis in the ionosphere using ground based GPS measurements

Show simple item record Galvan, D. A. Komjathy, A. Tony Song, Y. Stephens, P. Hickey, M. P. Foster, J. 2013-08-30T22:23:43Z 2013-08-30T22:23:43Z 2011-09-20
dc.identifier.citation Institute of Navigation (ION) ION GNSS 2011 Conference, Portland, Oregon, September 20-23, 2011 en_US
dc.identifier.clearanceno 11-4598
dc.description.abstract Ground-based Global Positioning System (GPS) measurements of ionospheric Total Electron Content (TEC) show variations consistent with atmospheric internal gravity waves caused by ocean tsunamis following recent seismic events, including the Tohoku tsunami of March 11, 2011. We observe fluctuations correlated in time, space, and wave properties with this tsunami in TEC estimates processed using JPL’s Global Ionospheric Mapping Software. These TEC estimates were band-pass filtered to remove ionospheric TEC variations with periods outside the typical range of internal gravity waves caused by tsunamis. Observable variations in TEC appear correlated with the Tohoku tsunami near the epicenter, at Hawaii, and near the west coast of North America. Disturbance magnitudes are 1-10% of the background TEC value. Observations near the epicenter are compared to estimates of expected tsunami-driven TEC variations produced by Embry Riddle Aeronautical University’s Spectral Full Wave Model, an atmosphere-ionosphere coupling model, and found to be in good agreement. The potential exists to apply these detection techniques to real-time GPS TEC data, providing estimates of tsunami speed and amplitude that may be useful for future early warning systems. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2011. en_US
dc.subject tsunami monitoring en_US
dc.subject total electron content (TEC) en_US
dc.title Observing tsunamis in the ionosphere using ground based GPS measurements en_US
dc.type Preprint en_US

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