Physics
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3717101r&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 17, CiteID L17101
Physics
6
Atmospheric Composition And Structure: Ion Chemistry Of The Atmosphere (2419, 2427), Oceanography: General: Ocean Observing Systems
Scientific paper
On-board satellites techniques provide global coverage and could play an important role in the continuous oceanic survey to prevent the damage produced by powerful tsunamis. We report here new ionospheric observations related to three significant transpacific tsunami events triggered by the 2006 Kuril earthquake, the 2009 Samoa earthquake and the 2010 Chile earthquake. Total Electron Content (TEC) variations extracted from data recorded by a dense Global Positioning System (GPS) network based in Hawaii show ionospheric disturbances within the hours following the tsunami wave passage at sea-level. For each event, we observe ionospheric gravity waves propagating with velocity, direction and arrival time coherent with the tsunami. The tsunamigenic signature in the ionosphere is also compared to in-situ sea-level measurements. These observations provide new examples of the sensitivity of the ionosphere to tsunamigenic gravity waves and confirm that ionospheric monitoring by GPS can provide complementary information on tsunami propagation.
Loevenbruck Anne
Lognonné Philippe
Occhipinti Giovanni
Rolland Lucie M.
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