[M-IS29_29PM2] 地震・火山等の地殻活動に伴う地圏・大気圏・電離圏電磁現象

[MIS29-10] Study on lithosphere-atmosphere-ionosphere coupling inferred from the data of GPS surface displacement and ionopheric pe

*芳原 容英¹、三宅 梨沙¹、Chen Chieh-Hung² (1.電気通信大学　大学院情報理工学研究科、2.Institute of Earth Sciences, Academia Sinica, Taiwan)

キーワード：ionopheric perturbations, GPS surface displacement, lithosphere-atmosphere-ionosphere coupling, earthquake

Various scenarios of coupling mechanisms between the major seismic activities on the ground and overlaying ionosphere have been proposed, experimental evidence has not been observed clearly. In this paper we analyze long-term data from ground movement and ionospheric anomalies in relation with major earthquakes occurred around Japan. In association with major earthquakes, anomalous surface displacements are observed by dens GPS network whilst lower ionospheric perturbations are identified by continuous measurement of VLF/LF transmitter signals. As a result, we found that the ionospheric anomalies are observed preferably associated with the thrust type earthquakes. GPS surface displacements tend to occur in association with any types of earthquakes.