The science is mightily disputed, especially by USGS employees, however the World Series quake and the Good Friday quake were full moon quakes. There is a folk knowledge in South America that full moons often precede volcano eruptions. There is assumed a three-day window since the moon doesn't suddenly become full but slowly moves into position. The Sumatra section of the faultline is released and won't pop again like that for a long time, but adjacent sections are as stressed as ever. 23 Jan, roughly, look for another quake of major size around the Ring of Fire, and maybe a significant volcano.
I don't doubt that considering it was a six hundred mile long shift. Interesting observations. I'll watch.