secondary disturbance meaning in English

次级扰动

Owing to complicated earth ' s surface condition such as the steep stratum outcropping of front - zone of mountain or the huge thick gravel stratum ' s overlay and earth ' s surface large undulation , complicated underground geology structure developed extremely such as thrust and overthrust nappe , and violent change of the lateral velocity , etc . in front - zone of mountain there are a series of problems such as serious secondary disturbance and low signal - to - noise ratio in seismic exploration gathering
由于山前带高陡岩层出露或巨厚砾石层的覆盖、地表起伏大等复杂的地表条件、逆冲和逆掩推覆等复杂地下地质构造发育、速度横向变化剧烈等原因，造成了山前带地震勘探资料采集存在次生干扰严重和信噪比低等一系列问题。