For all those interested, as I am, the quake that hit off of Hoshu Japan in 2011 started out as a 7.3 on 3-9-11. It had several aftershocks and was a large part of the reason they didn't see the 3-11-11 quake coming. They assumed it was a single earthquake and not a sign of things to come.

Interestingly enough, on the same day (March 9th) Papa New Guinea had a 6.5.

On March 10th China experienced a 5.4 and Indonesia/Malaysia had a 6.5.

These fault zones have always been connected. If I lived anywhere along any of these zones I would be very concerned with the increase of activity as of late.

No idea what happened immediately before the 3-11-11 quake. Still looking for some sort of record of aftershocks.

Edit: The depth of the Hoshu foreshock quake was 32 KM....this most recent quake in PNG is at a depth of 40 KM