The Japan earthquake of March 11th, 2011 (Mw = 8.9R) as viewed in terms   of local lithospheric oscillation due to M1 and K1 tidal components. A brief   presentation
  The time of occurrence of the large EQ that occurred recently in Japan (March 11th, 2011, Mw = 8.9) is compared to the time of peak amplitude occurrence of the M1 and K1 tidal components. It is shown that the specific EQ occurred on the peak of the M1 tidal component, and deviates for only 45 minutes from the corresponding K1 tidal peak. Therefore, the specific seismic event complies quite well with the earlier proposed physical mechanism (lithospheric oscillation) that causes triggering of large EQs. 
C. Thanassoulas, V. Klentos, G. Verveniotis, N. Zymaris
physics.geo-ph