-Removed-There may be many things that influence earth quakes, but until there is a discernible pattern it is best not to draw conclusions.
The Japanese quake was unusually large, so I can understand trying to find a special reason for it, but the New Zealand one was only special in that it struck a city and so as earthquakes go was not statistically significant. As I mentioned in the other recent earthquake thread, there seem to be as many as three >6.0 earth quakes per week on average - at least there were in the month of the New Zealand quake.
But at the end of the day, earthquakes happen for a known reason (tectonic plates move) and will happen regardless of other influences, so the only possible effect of influences would be magnitude or the exact time of occurrence and I see no real reason to start looking for a cause when all we really have is one massive earthquake. Now if you had 20 large earthquakes that matched up with another phenomena that could conceivably affect earthquakes, then I might be interested, but a statistic of one really isn't good enough.