There is no history of Tsunami's in this area of the Indian Ocean. This has been discussed and discussed and discussed in other threads.
Information about tsunamis in the Indian Ocean can be found here. They are rare, compared to the Pacific Ocean, but not unheard of. Thailand and Indonesia were lax in their, IMO, since they border both the Indian and Pacific Ocean.
http://iri.columbia.edu/~lareef/tsunami/