Damage From the Blast

Km from                                       Max. blast  Max. wind
hypocenter    Extent of damage                 pressure    speed
                                               (kg/cm �)  (m/sec)
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0                                                   3.5    440
0.3     Surface of iron bridges moved.              2.4    330
0.5     Strong iron-framed buildings crushed.       1.9    280 
        Roofs blown off and walls knocked over.
0.8     Almost all structures destroyed except      1.5    200 
        ferroconcrete buildings and those
        built to withstand earthquakes.
1.0                                                 1.0    160
1.6     Complete destruction of all brick           0.48    86 
        buildings two-stories and higher.
1.8     Major damage (major and irreparable         0.38    72 
        damage to all buildings).
2.0     Major damage to all brick buildings         0.30    60 
        two stories and higher.
2.3     Collapse of wood buildings.                 0.22    45 
2.6     Moderate damage (All buildings usable       0.16    36 
        only after repairs. Wood buildings
        irreparable.)
3.2     Partial damage (Wood buildings              0.12    28 
        usable after repairs.)