Physics
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3817312h&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 17, CiteID L17312
Physics
2
Geodesy And Gravity: Atmosphere Monitoring With Geodetic Techniques (6952), Geodesy And Gravity: Satellite Geodesy: Results (6929, 7215, 7230, 7240), Ionosphere: Ionospheric Disturbances, Seismology: Earthquake Interaction, Forecasting, And Prediction (1217, 1242, 4315), Seismology: Subduction Zones (1207, 1219, 1240)
Scientific paper
The 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.
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