Ok, i will try to explain the situation:-
This is the pic released by ISPR, try to relate it with the one i have taken from GE:-
Image from GE (late 2011):-
Another view of the area:-
So as you guys can see that the BHQ was well located both to cover the enemy approach (the 'La' Balti word for Way/Route - from where the avalanche was initiated) and to avoid contact in case an avalanche occurred (atleast 1 KM away from it over a PLAIN area where avalanches cannot normally travel and that too shielded by a River!).
This was totally unexpected as avalanches normally happen over a mountain i.e. the snow that has been piling over it slips and moves, but in this case the entire bl00dy GLACIER has moved as shown in pic #2 (see the area above the point where i have pointed out the location of ice in late 2011 - this ice is not exactly ice rather a mountain of ice which have been formed over hundreds over years and which moves an inch over 10 years!). Damn it! Glaciers dont move in this part of the world! There is no Arctic Ocean touching the feet of the glacier and melting it!!
And then surprisingly there was no earthquake that could have shifted it either. It's like, one fine morning a mountain gets up and sits on you without any reason!