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Ionospheric electron enhancement before the 2011 Tohoku Eq.detected with a dense GPS array

Kosuke Heki  
【摘要】:正The 2011 March 11 earthquake in NE Japan(Mw9.0) caused vast damages to the country.However,large events beneath dense geophysical observation networks could bring breakthroughs to seismology and geodynamics.Here I report one such finding,precursory changes in ionosphere. Global Positioning System(GPS) has been used to measure ionospheric total electron content(TEC),number of electrons integrated along the satellite-to-receiver line-of-sight.I analyzed the TEC behavior using the Japanese dense network of GPS with the method of Ozeki and Heki,and detected clear precursory positive anomaly of

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