The top video of the link is an interesting view of the blast. I'm guessing it's taken from ~200m east of the explosion, in front of Amarin, based upon the escalator to the left and the crosswalk in front which likely goes into Erawan Mall.
http://www.stuff.co.nz/world/asia/71...kok-bomb-blast
It's a good thing that blast wasn't focused or this could have been much worse.