A vertical fault has neither a footwall nor a hanging wall. 具有直立断层面的断层既无上盘，也无下盘。
Then the block in the southern side of this fault is the hanging wall and the block in the northern side of this fault is the footwall. 那么，位于这条断层南侧的岩层是上盘，位于这条断层北侧的岩层则是下盘。
