The heights mentioned are quite possibly "run-up" heights. That would be the distance above sea-level of the highest elevation contour line the water reached.

I'm not sure how that relates to actual wave-height, but it's safe to say that there was nowhere a wave "face" of those heights (30 meters or 100 feet).

In 1946 the Scotch Cap lighthouse on Unimak Island (Aleutians) was destroyed by a tsunami with a run-up height of 35 meters. In this case, the height was determined by noting wave damage at the top of a very sheer cliff. That wave may have actually been over 100 feet high. Though, still, not with the oft-imagined sheer/concave face.

Mike Williams