Missionaries or families of missionaries who are currently in the region- India, Sri Lanka, Maldives, Thailand, Indonesia, please try calling them up to warn them and/or others of danger- upto 2 hours from now available- WILL BE OF GREAT HELP.
If there was a tsunami I doubt it would affect Thailand, India, or Sri Lanka much at all, if it was a rupturing of the subduction zone south of the December Rupture.
However, it would hit Diego Garcia, Madagascar, and NW Australia much more than the December one (IF there was a tsunami, of course.)