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Ionospheric electron enhancement preceding the 2011 Tohoku-Oki earthquake

Heki, Kosuke

Geophysical Research Letters, 2011, 38(17), L17312

Permalink : https://hdl.handle.net/2115/48572

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アクセス権
open access
URI
https://hdl.handle.net/2115/48572
タイトル
Ionospheric electron enhancement preceding the 2011 Tohoku-Oki earthquake
著者
e-Rad_Researcher
30280564
著者名
Heki, Kosuke
言語
英語
キーワード
Positive TEC anomaly appears before M9 class events
The anomaly occurs above the epicenter and lasts ~1 hour
M9 class earthquakes can be predicted
発行日
2011-09-15
出版者
American Geophysical Union
収録物名
Geophysical Research Letters
巻(号)
38(17)
ページ
L17312
抄録
he 2011 March 11 Tohoku‐Oki earthquake (Mw9.0) caused vast damages to the country. Large events beneath dense observation networks could bring breakthroughs to seismology and geodynamics, and here I report one such finding. The Japanese dense network of Global Positioning System (GPS) detected clear precursory positive anomaly of ionospheric total electron content (TEC) around the focal region. It started ∼40 minutes before the earthquake and reached nearly ten percent of the background TEC. It lasted until atmospheric waves arrived at the ionosphere. Similar preseismic TEC anomalies, with amplitudes dependent on magnitudes, were seen in the 2010 Chile earthquake (Mw8.8), and possibly in the 2004 Sumatra‐Andaman (Mw9.2) and the 1994 Hokkaido‐Toho‐Oki (Mw8.3) earthquakes, but not in smaller earthquakes.
資源タイプ
学術雑誌論文
出版タイプ
Version of Record
権利情報
Copyright 2011 American Geophysical Union.
PISSN
0094-8276
関連情報 (isIdenticalTo)
出版社版DOI
https://doi.org/10.1029/2011GL047908