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Ionospheric electron enhancement preceding the 2011 Tohoku-Oki earthquake

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Title: Ionospheric electron enhancement preceding the 2011 Tohoku-Oki earthquake
Authors: Heki, Kosuke Browse this author
Keywords: Positive TEC anomaly appears before M9 class events
The anomaly occurs above the epicenter and lasts ~1 hour
M9 class earthquakes can be predicted
Issue Date: 15-Sep-2011
Publisher: American Geophysical Union
Journal Title: Geophysical Research Letters
Volume: 38
Issue: 17
Start Page: L17312
Publisher DOI: 10.1029/2011GL047908
Abstract: 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.
Rights: Copyright 2011 American Geophysical Union.
Type: article
Appears in Collections:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 日置 幸介


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