- 人と自然 (ISSN:09181725)
- vol.8, pp.159-174, 1997 (Released:2019-09-29)
More than 100,000 wood buildings collapsed by the Hyogo-ken Nanbu Earthquake (Jan. 17,
1995. M=7.2). We researched the collapse pattern and direction of about 2700 wood buildings
from Takarazuka City to the northern part of the Awaji Island to estimate the shock directions
of the earthquake in the hypocentral region . The following remarkable features were observed.
Most of the collapsed wood buildings were damaged in a similar manner: their basal floors
were inclined or collapsed in a direction in the case both of one and two storied buildings,
although their second floors and/or roofs were not severely damaged.
Predominant collapse direction of the wood buildings was observed in the narrow zone,
Shi nsai no Obi (zone heavily damaged by the earthquake), from Suma to Takarazuka. In the
zone , five blocks were found out according to the collapse directions of the wood buildings.
The predominant collapse direction implies that a strong shock collapsed most of the wood
buildings in each block, and suggest that main shock directions were opposite to the collapse
direction in the blocks.