A vertical fault has neither a footwall nor a hanging wall. 具有直立斷層面的斷層既無上盤，也無下盤。
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，位于這條斷層南側的巖層是上盤，位于這條斷層北側的巖層則是下盤。
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