The basin was formed by active faults, including those in the Mitoke Fault Zone, Nishiyama Fault Zone and Arima-Takatsuki Tectonic Line, and in addition, Hanaori Fault.
三峠断層帯、西山断層帯、有馬-高槻構造線、花折断層などいくつもの断層の運動からできた盆地である。