quaternary center meaning in Chinese

四级中心

It is believed that three northeast - striking dextral slip fault zones , i . e . the baxian - shulu - handan fault zone , the huanghua - dezhou - dongming fault zone , and the linyi - huanghekou fault zone , are the result of the tectonic transform of paleogene extending to neogene - quaternary laterally slipping of north china plain rift systems , which extend along the central axis of rifts and accord with the quaternary centers of subsidence as the main seismic structures within the rifts
认为坝县束鹿邯郸断裂带、唐山河间磁县断裂带和黄骅德州东明断裂带3条北东向右旋走滑断裂带为华北平原裂谷系从早第三纪伸展拉张作用进入晚第三纪第四纪走滑剪切拉张作用的产物，这3条断裂带分别位于3个北东向坳陷带中部，并构成了第四纪沉降中心，与营口潍坊断裂带起构成华北平原内的主要强震构造。