[ichabod1]

At what point would it be considered a separate earthquake from the first, rather than an aftershock?

I don't know, and I know that aftershocks can be just as strong or stronger than the original, but I think it must have to do with where the epicenter is located. If it's a substantial distance from the first one, it may be considered a separate quake.

[Palladin]

I often wonder how they differentiate between “aftershocks” and new quakes.