1995年兵庫県南部地震における 木造家屋の倒壊様式と倒壊方向

抄録

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.