The research shows that the piedmont belt in the middle segment of Longmen Mountains is composed of Beichuan-Yingxiu fault, Anxian-Dujiangyan Dam fault and the nappe between them.

• 研究认为：龙门山中段前山带主要由北川-映秀断裂、安县-都江堰断裂2条走向北东、倾向北西的大断裂和两者之间的彭灌推覆体组成。