[S20-1] Earth and planetary space and remote sensing seismology; i.e., seismology without seismometers

[S20-1-03] Traveling Ionospheric Disturbance Triggered by Tsunami Observed by GPS and Geostationary Satellites of BeiDou

^○Jann-Yenq Tiger Liu¹, Pei-Hsuan Lin¹, Tso-Ren Wu², Yu-Lin Tsai², Ho-Fang Tsai³, Chien-Hung Lin³, Chia-Hung Chen³ (1.Institute of Space Science, National Central University, Taoyuan, Taiwan, 2.Graduate Institute of Hydrological and Oceanic Sciences, National Central University, Taoyuan, Taiwan, 3.Department of Earth Science, National Cheng Kung University, Tainan, Taiwan)

An earthquake of magnitude 9.0 occurred near the east coast of Honshu (Tohoku area) generates a serve tsunami and disturbed the total electron content (TEC) within the ionosphere, which is called the tsunami-traveling ionospheric disturbances (TTIDs). Measurements of ground-based GPS receivers in Japan and Hawaii are employed to study TTIDs in the Pacific Ocean area. It is found that the TTID periods are of about 10-20 minutes. In the Japan region, the TTIDs initially lags tsunami wave by about 9.6 minutes, which is comparable to the estimated upward propagating time of acoustic gravity waves in the atmosphere, while in the Hawaii region, the TTID leads the underneath tsunami waves by about 1 hour, which might result from the oblique propagation of traveling atmospheric disturbances induced by tsunami waves. Finally, an observation network of ground-based receivers receiving signals from geostationary satellites of the BeiDou system is proposed to monitor TTIDs in the Asian area.