Preseismic TEC changes for Tohoku-Oki Earthquake: Comparisons between simulations and observations

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題名:	Preseismic TEC changes for Tohoku-Oki Earthquake: Comparisons between simulations and observations
作者:	郭政靈;Kuo, Cheng-Ling;Lee, Lou-Chuang;Heki, Kosuke
貢獻者:	地球科學學院太空科學與工程學系
關鍵詞:	Anomalies;atmospheric science;Computer simulation;Current density;Earthquake precursor;Earthquakes;geology;geophysics;Global positioning systems;GPS;hydrology;Ionosphere;Ionospheric models;Lithosphere;oceanic science;Positioning systems;Satellite navigation systems;Seismic activity;space science;Tohoku-Oki earthquake;Total Electron Content;Total electron content anomaly
日期:	2015-01-01
上傳時間:	2026-04-23 11:05:43 (UTC+8)
出版者:	Chinese Geoscience Union;Taiwan: CHINESE Geoscience Union
摘要:	摘要： Heki (2011) reported that the Japanese Global Positioning System (GPS) dense network detected a precursory positive total electron content anomaly (TEC), with Delta TEC similar ~3 TECU, similar ~40 minutes before the Tohoku-Oki earthquake (Mw 9.0). Similar preseismic TEC anomalies were also observed in the 2010 Chile earthquake (Mw 8.8), 2004 Sumatra-Andaman (Mw 9.2) and the 1994 Hokkaido-Toho-Oki (Mw 8.3). In this paper we apply our improved lithosphere-atmosphere-ionosphere (LAI) coupling model to compute the TEC variations and compare the simulation results with the reported TEC observations. For the Tohoku-Oki earthquake simulations we assumed that the stressed associated current started similar ~40 minutes before the earthquake, linearly increased and reached its maximum magnitude at the time of the earthquake main shock. It is suggested that a dynamo current density of similar ~25 nA m(-2) is required to produce the observed Delta TEC similar ~3 TECU.(en) 出版者： Taiwan: CHINESE Geoscience Union 出版日期： 2015-02-01 出處： TAO : Terrestrial, atmospheric, and oceanic sciences, 2015-02, Vol.26 (1), p.63-72 資源來源：華藝CEPS中文電子期刊服務版權： 2015. This work is licensed under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. 識別號： ISSN: 1017-0839 識別號： ISSN: 2223-8964 識別號： ISSN: 2311-7680 識別號： EISSN: 2311-7680 識別號： DOI: 10.3319/tao.2014.08.19.06(grt)
顯示於類別:	[太空科學與工程學系] 期刊論文

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