低速异常 meaning in Chinese

low-velocity anomal

( 2 ) in southern china , the velocities are near average value . a little low velocities exist in the regions such as zhujiangkou , middle of guangxi , lushan and so on . a little high velocities exist in the middle region lied to the south of yangzi river and to the north of zhujiang river
东部地区速度变化以低速异常为主：整个华北和东北地区，都呈现pn低速异常，特别是华北盆地区、渤海湾和山西地堑低速异常非常明显，最小低于7 . 8km / s ；华南地区整体上在平均值上下，在珠江口地区、广西中部地区、庐山地区波速略微偏低，在长江以南，珠江以北地区中部波速略微偏高。
The high or low velocity anomalies ' s locations are consistent with the uplift and depression respectively , and their contacting boundary always correspond the faults exposed on the ground ' s surface . the basement interface that is the bottom interface of the sedimentary cover undulates strongly
上部地壳高速异常和低速异常分别与地表的隆起和坳陷高度一致，高速异常和低速异常的接触带往往与地表的断裂位置有良好的对应关系，沉积盖层底部的基底界面横向上起伏变化较大。