Abstract
In order to deepen understanding of the characteristics of near-field ground motion, case histories of upthrow of objects during 21 earthquakes are reviewed. The fault distance to the site where the upthrow was observed becomes larger with increase of the earthquake magnitude. The area where the upthrow was observed roughly corresponds to that of the J. M. A. intensity VII which is X or greater in the M. M. scale. The upthrown objects are boulders, stone mouments, human bodies, small structures and wooden houses, with limitation in size. In case of the boulder, one on a shallow socket of surface soil and with the diameter of approximately 50cm tends to have a large displacement. These facts may suggest the soil-object interaction system with a limited vibration period causes a large response of the object and the resulting upthrow under strong shaking of the M. M intensity X or greater.
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