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Hokkaido University Collection of Scholarly and Academic Papers >
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Peer-reviewed Journal Articles, etc >
Preseismic TEC Changes for Tohoku-Oki Earthquake : Comparisons Between Simulations and Observations
| Title: | Preseismic TEC Changes for Tohoku-Oki Earthquake : Comparisons Between Simulations and Observations |
| Authors: | Kuo, Cheng-Ling Browse this author | | Lee, Lou-Chuang Browse this author | | Heki, Kosuke Browse this author →KAKEN DB |
| Keywords: | Earthquake precursor | | Total electron content anomaly | | Tohoku-Oki earthquake |
| Issue Date: | Feb-2015 |
| Publisher: | CHINESE Geoscience Union |
| Journal Title: | Terrestrial atmospheric and oceanic sciences |
| Volume: | 26 |
| Issue: | 1 |
| Start Page: | 63 |
| End Page: | 72 |
| Publisher DOI: | 10.3319/TAO.2014.08.19.06(GRT) |
| Abstract: | 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. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/58810 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 日置 幸介
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