[U-04] International Efforts Supporting Global Navigation Satellite System-Enhanced Tsunami Early Warning

[U04-P01] GNSS total electron content for ionospheric tsunami early warning

Tien-Chi Liu¹, Katsumi Hattori², *JANN-YENQ Liu^3,4,5, CHIYEN LIN^3,4, Yu-Lin Tsai¹, Tso-Ren Wu¹ (1.Graduate Institute of Hydrological and Oceanic Sciences, National Central University, Taiwan, 2.Graduate School of Science, Chiba University, Japan, 3.Center for Astronautical Physics and Engineering, National Central University, Taiwan, 4.Department of Space Science and Engineering, National Central University, Taiwan, 5.Center for Space and Remote Sensing Research, National Central University, Taiwan)

Keywords:ionospheric total electron content, tsunami early warning, global navigation satellite system

Tsunami waves can induce Tsunami Traveling Ionospheric Disturbances (TTIDs) of the total electron content (TEC). In this study, we examine the TEC derived by ground-based receivers of the global positioning system (GPS) and identify TTIDs induced by 2004 Indian Ocean tsunami. Simulations of the COMCOT (Cornell Multi-grid Coupled Tsunami) model and analyses of the circle method, the ray-tracing technique, and the beam-forming technique are used to show that TTIDs can be quickly detected and confirmed after the tsunami occurrence. Finally, the ionospheric TEC derived by existing ground-based GNSS (global navigation satellite systems) receiving stations is demonstrated to be useful to support the tsunami early warning system.