A tidal wave is something completely
different to a tsunami, but a lot of people don't seem to realise this.

For the last time, it is not.

Get hold of a dictionary and look up the meaning.

Maybe its a common use of it, but its not correct, as those of us with
degrees in geology know. It may have become an alternative name for those
who don't know better, but the original meaning is quite different.

Regards,

Stuart