Chris,

I didn't check, your numbers might be a bit of an underestimate, but in the ballpark.

Just to calibrate, we're finding half a bar tides (some of the biggest) can influence the timing of earthquakes enough that roughly 3/4 of the quakes are in the more encouraging half of the time.

So a big landslide has a small chance of triggering an earthquake if the fault is ripe, perhaps a larger chance of setting one off in the days afterwards, enough to account for advancing the quake several years as you state.

It would be no surprise if a large landslide set off a number of small aftershocks.

John