Depending on a lot of factors, imho,
Sumatra should have protected the Western Thai coast SOMEWHAT.
But I don't think that takes into account anything other than the original site of the original 8.5 quake.
And, I don't know about the reverberations of waves back and forth across the Bay of Bengal.
Hey expat, you still around, or did you lose your connection? I was looking forward to your first hand accounts.
FGS