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The Tohoku EQ (11th of March, 2011, M = 9.0) in Japan falsified the proposedEQ magnitude range (M = 7.0 - 8.5) of the same seismogenic regional area thathad been determined by the compiled hazard maps, study of historical data, orother probabilistic methods while a larger magnitude (M > 9.0) had beenproposed for all subduction zones. The observed discrepancy between theproposed EQ magnitude range and the actual one of the Tohoku EQ is studied inthis work in terms of the cumulative seismic energy release of the study areaand by the use of the Lithospheric Seismic Energy Flow Model (LSEFM). Theresults indicate that the Tohoku mega-earthquake magnitude could be predictedquite accurately provided that a long past seismic history had been availablefor use by the LSEFM procedure. Moreover, the presence, of the missing historic1855 EQ (7.0 < M < 8.0) from seismic catalogs, was predicted backwards by theLSEFM method and its existence was verified by the Ishibashi (2004) work onJapanese historic seismicity. The recurrence time of the Tohoku EQ is estimatedas being at least as 100 years. It is proposed frequent monitoring of theJapanese area seismic potential by compiling regularly in time thecorresponding seismic potential maps.  Key words: Tohoku earthquake, earthquake magnitude, lithosphere, cumulativeseismic energy, mega-earthquakes, seismic potential maps.

Was the magnitude (M = 9.0R) of the mega-earthquake of Japan (11th of  March, 2011) predictable? An analysis based on the Lithospheric Seismic  Energy Flow Model (LSEFM)