to make the tsunami, we need a Proximity Trigger, Anim Object, Water Volume, VisArea, two Cut-Scene and small flow graph system.
Create a cut-scene.

Create AnimObject and ProximityTrigger.

Select the object (see the screenshot, there is written the path to the model.).

add Anim Object in the cut-scene.

Proximity Trigger bind to AnimObject.

add track to wave animation.

select an animation.

result.

Add Proximity Trigger in the cut-scene and make sure that Proximity Trigger was at the beginning of a wave.

Create Visarea. There should be asphalt with a cars and camera. Then, create a Water Volume.

create a second cut-scene.in the second cut-scene add camera.

Make the animation camera.

everything to work, create a Flow Graph.

The overall result.


Result
http://www.youtube.com/watch?v=rUnPE0Fj8xA