A short note on the two most recent large EQs of New Zealand (Mw=7.0 on   September 3rd, 2010 and Mw=6.1 on February 21st, 2011). A typical example of   tidally triggered large EQs by the M1 tidal component
  The time of occurrence of the two most resent large EQs of New Zealand (Mw = 7.0 on September 3rd, 2010 and Mw = 6.1 on February 21st, 2011) is compared to the time when the lithospheric oscillation at the focal area reaches its peak amplitude in terms of the M1 (Moon declination) tidal component. The observed very good coincidence of the EQs occurrence time with the lithospheric oscillation peak amplitude time for the M1 tidal component clearly suggests that both these EQs were triggered by the M1 component of the lithospheric tidal oscillation. It is speculated that large preseismic electric signals should be observed before the EQs occurrence if the appropriate hardware were installed. 
C. Thanassoulas, V. Klentos, G. Verveniotis, N. Zymaris
physics.geo-ph