Are there other instances such a violent impact that caused such shocking break up?
The more I see the images, the more astounded I am by the number of such widely spread out tiny pieces of wreckage.
I suppose it is safe to assume that there are plenty of images that we won't see in the public domain but I'd have expected some larger pieces considering that it didn't hit a flat surface
If an aircraft hits a hard surface at high velocity this is exactly what to expect. If it hits a soft surface there may be no trace of the aircraft. That is certainly the case for a fighter jet which "tent-pegs" at transonic speed.