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The projection of sewerage manholes above ground has been observed during earthquakes that hare caused significant soil liquefaction. The force that moves a manhole upward can be attributed to the buoyancy caused by the liquefied soil, since no other reasonable causes are apparent. The weight of the ƒL�[ƒ��[ƒh�i‰p�j�F - ‹LŽ–‹æ•ª�F ‰p•¶ƒm�[ƒg�i“Š�e˜_•¶�j ‹æ•ª �@�@�@�@˜_•¶�W