Does an ionospheric hole appear after an inland earthquake?

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题名:	Does an ionospheric hole appear after an inland earthquake?
作者:	劉正彥;Kamogawa, Masashi;Kanaya, Tatsuya;Orihara, Yoshiaki;Toyoda, Atsushi;Suzuki, Yuko;Togo, Shoho;Liu, Jann-Yenq
贡献者:	地球科學學院太空科學與工程學系
关键词:	acoustic wave;Acoustic waves;Atmospherics;Depression;earthquake;Earthquakes;Geodetics;Geologic depressions;Geophysics;Global positioning systems;GPS;Ground motion;inland earthquake;Ionosphere;ionospheric disturbance;Ionospheric disturbances;Ionospheric plasma;Ionospheric propagation;Ionospherics;Seismic activity;total electron content;Traveling ionospheric disturbances;tsunami ionospheric hole;Tsunamis;Uplift
日期:	2015-11-01
上传时间:	2026-04-23 11:03:34 (UTC+8)
出版者:	Wiley-Blackwell;Washington: Blackwell Publishing Ltd
摘要:	摘要： AbstractIonospheric disturbances occurred as a result of the tsunami associated with the 2011 M9.0 off the Pacific Coast of the Tohoku earthquake (EQ). The ionospheric disturbances propagated radially from the tsunami source area, termed the traveling ionospheric disturbance. In addition to the traveling ionospheric disturbance, an ionospheric plasma depression lasting for approximately 1 h occurred above the tsunami source area, called a tsunami ionospheric hole. In this study, we compare the ionospheric disturbances caused by large inland and submarine EQs to investigate whether an ionospheric plasma depression only occurs in association with a tsunami. Note that we term an EQ with a tsunami a submarine EQ. To investigate the presence of a plasma depression, i.e., an ionospheric hole, associated with an inland EQ, data on total electron content between the global positioning system satellite and its receivers were used. Comparison of two inland and two submarine EQ events with similar magnitudes around 7 showed that ionospheric holes were observed only for the submarine EQs. This discrepancy might be attributed to the different excitation amplitudes of the atmospheric acoustic waves between the unidirectional fault displacement and the tsunami uplift/depression, corresponding to quarter and one‐period variations. From this hypothesis, we predicted that an ionospheric hole could be observed after a significantly large inland EQ with a sufficiently large vertical ground displacement. In fact, we recognized the ionospheric hole generated by the large inland EQ that recently occurred in the Nepal with the magnitude of 7.8 on 25 April 2015. 其他題名： J. Geophys. Res. Space Physics 出版者： Washington: Blackwell Publishing Ltd 出版日期： 2015-11-01 出處： Journal of Geophysical Research: Space Physics, 2015-11, Vol.120 (11), p.9998-10005 資源來源： Wiley Online Journals ** 版權： 2015. American Geophysical Union. All Rights Reserved. 版權： Copyright Blackwell Publishing Ltd. Nov 2015 識別號： ISSN: 2169-9380 識別號： ISSN: 2169-9402 識別號： EISSN: 2169-9402 識別號： DOI: 10.1002/2015JA021476
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