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Ionospheric electron enhancement preceding the 2011 Tohoku-Oki earthquake
| Title: | Ionospheric electron enhancement preceding the 2011 Tohoku-Oki earthquake |
| Authors: | Heki, Kosuke Browse this author →KAKEN DB |
| 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 |
| URI: | http://hdl.handle.net/2115/48572 |
| 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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