The difficulty that you will encounter if you only have data from two recording stations is that you may be confused about finding the exact epicenter and you will not be able to triangulate the epicenter. Using data from at least three stations require from a triangulation method gives exact location of an epicenter.
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Answer:
The difficulty that you will encounter if you only have data from two recording stations is that you may be confused about finding the exact epicenter and you will not be able to triangulate the epicenter. Using data from at least three stations require from a triangulation method gives exact location of an epicenter.