In Bachu Area, the major factor of impacting average velocity variety is multi big Angle unconformity interface that heave tectonic movement formed and big heave fault.
在巴楚地区，影响平均速度变化的主要因素是大的构造运动形成的多角度不整合界面和断距较大的断层。
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The late Cretaceous-Eocene unconformity is widely developed in the Jiuquan Basin, especially in Huahai area where the tectonic deformation is very prominent.