Some researchers feel that the waves may be far smaller when they reach the US east coast.  And some scientists don't think they are right.  SCIENCE PROCEEDS BY ARGUMENT.  So we will not know who is right until the collapse occurs. The Relevant ref are:  Mader, C.L. 2001 Modeling the La Palma landslide tsunami.  Science of Tsunami Hazards 19,  160-180.

Gisler, G. Weaver, B.  and Gittings, M. 2005 SAGE calculations of the tsunami threat from La Palma.  Proceedings of the 2nd International Tsunami Symposium.  Chania. P65-71

Comments from Professor Bill McGuire (Benfield Hazard Research Centre UCL):

‘There could be five more summit eruptions of the Cumbre Vieja before the western flank collapses, there could be 10, there could be 20.  On the other hand, the west flank could collapse during the next eruption.  We simply don’t know.  This would be the biggest natural catastrophe in history.

There’s a problem with all major natural catastrophes.  Because we’ve never experienced these things, we don’t think that they’re going to happen to us.  We just ignore them, but these sorts of events have occurred throughout geological history.  They’re not going to stop happening just because we’re around.’

‘La Palma is going to collapse into the North Atlantic.  It’s not a question of if, it’s just a question of when.’