Thank you for your thoughts, even though our own area is safe from tsunamis.
The warning system, put into place after the 2004 disaster, was activated when the earthquake happened. The news broke on Wednesday evening and we were all alert here because many of us know people who live and work in the vulnerable areas of Thailand.
As it happens, the earthquake was not of a type to cause a tsunami and the emergency was soon cancelled. We did see, though, that many tourists and residents didn't take the matter seriously,
The vulnerable tourist area is on the west coast facing the Andaman Sea. I would recommend instead a beach holiday on the Gulf of Thailand coast where tsunamis are very unlikely to reach. Kho Samui in the south is an example but I think that Kho Chang (Elephant Island) in the south east is better.