Engineers then typically dig out shallow trenches or pits along the path to obtain earth for the levee. 工程师通常会沿预定路线挖出浅浅的壕沟或土坑，取得海堤用的泥土。
The tremors liquefy the soggy layer like a blender, and the levee or wall can surf laterally for tens of yards, tearing the structure apart. 震动会产生液化作用，像果汁机一样将湿润的土层液化，让海堤或防洪堤向侧面移动数十公尺之远，使得其结构瓦解。
