Well, if they are within a certain number of km from the big rupture, I think that's what makes them aftershocks. Scary for the inhabitants either way, though. Wow.
Looks like one big quake to me Wow!
The interesting fact about this map is the parallel orientation of the green land masses. It would appear the plates rubbed against each other and raised up th malay Penninsula and Singapore. Then did it again transposed and made Sumatra and now is doing it again along the axis of the current series of quakes.
Realestate for development is being created as we post.