落差随深度显著增长，从上升盘到下降盘(见断层上盘与下盘)其相关部分厚度大为增加的断层。又称同沉积断层或同生断层(见图)。主要发育于伸展断陷(见断陷型盆地)、被动大陆边缘的三角洲前缘和盐构造等地区，在伸展断陷形成发育的过程中，上盘不断沉降，沉积不断进行，下盘不断隆起，这些作用都是由于控制凹陷边缘断层的不断活动而发生的。
同生断层也称生长断层、同沉积断层。
The concept of syngenetic fault is known as growth fault or synsedimentary fault.
生长断层常见于墨西哥湾以及其他地壳快速沉陷或拉分的地区。
Growth faults are common in the Gulf of Mexico and in other areas where the crust is subsiding rapidly or being pulled apart.
伸展盆地生长断层上盘的断鼻型圈闭与逆牵引背斜型圈闭一样是油气勘探的主要目标。
The reverse drag anticline traps and the nose shaped high trap in the hanging wall of growth fault in extensional basin are the major targets in oil and gas exploration.
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