Sidebar Elements of an Explosion Blast Air being propelled at tremendous force and speed creates an over-pressure traveling outward in all directions away from the source for great distances. The pressure wave, reflected and channeled by the design of buildings and layout of streets. This causes the pressure effect to last longer and can increase structural damage. Fragmentation Any item that is part of or near to the bomb when it explodes becomes a projectile. The larger the explosive charge, the farther the fragments will travel.
Fragments normally travel in a straight line but, like a bullet, can also be deflected.
This occurs as the blast over-pressure hits and breaks structures, e.g., windows, doors, collapse of false ceilings, office equipment, etc. Partial Vacuum Return to normal pressure. At this stage, windows not destroyed by the initial blast may be sucked out. The transmission through the ground of the blast wave pressure. This causes problems with gas, water, electricity, sewers, telecommunications, etc., and may also cause structural damage to the foundations of buildings and subway systems.