Hi Roger. I have to agree with you. The aftershock activity in the area of the M>7.7 quake is going to last for quite awhile.

Using a radius of 25 miles you can see there was almost no quakes before the M>7.7. In order for a quake not to be considered as an aftershock the activity in the area has to return to back ground level, which in this case is a quake about every 20 years.

The catalog used was the ANSS with a 25 mile radius and quakes M>4.0 and larger. Take Care…Don in creepy town

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