第1図．反射法地震探査により確認された撓曲ゾーンの分布と推定される撓曲構造のトレース．基図は国土地理院発行の都市圏活断層図「大阪西南部」(中田ほか,1996)．矢印を付した濃いピンク色の帯状部は活撓曲，薄い緑色部は沖積低地，薄いピンク色の部分は低位段丘面.

Fig. 1. Distribution of flexure zones (thick dark violet lines) confirmed by seismic reflection profiling and inferred trace of the flexure (pale violet belt). Base map: 1: 25,000 Active Fault Map in Urban Area "Osaka seinanbu" (Nakata et al., 1996) published from the Geographical Survey Institute. Light gray and light pink areas are alluvial lowland and lower terrace surface, respectively. Deep pink belts with red arrows are flexures on the lower terrace surfaces.