GSOB
Buk's warhead has 6000 or more striking elements. The very local impact means that almost all that charge was absorbed by the cockpit. However the deck's floor has a small number of holes.
FYI: very rough estimate. Surface area of a sphere
A = 4 pi R^2.
For a 10-m radius A = 1,200 sq.m.
Shrapnel density: 6000/A = 5 pcs per sq. m.