IAG-IASPEI 2017

講演情報

Oral

IASPEI Symposia » S20. Earth and planetary space and remote sensing seismology; i.e., seismology without seismometers

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

2017年8月1日(火) 13:30 〜 15:00 Room 402 (Kobe International Conference Center 4F, Room 402)

Chairs: Lucie Rolland (Observatoire de la Côte d'Azur) , Kosuke Heki (Hokkaido University)

14:00 〜 14:15

[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.