The faults developed in unconsolidated soft sediments are often macroscopically obscured, so that their occurrence and mode of motion are difficult to be identified only by macroscopic observation.

• 摘要松散沉积物中的断层常常未留下明显的宏观形迹，单靠肉眼观测往往难以确定断层是否存在，即使判断出有断层亦常难以确定其活动性质和活动方式。