The main reason for the subsidence has been excessive drawing of ground water by aquaculture pond operators. Therefore, in analyzing this problem, it is crucial to know the land area devoted to fish ponds.
西海岸地層下陷的主要原因是沿海養殖魚塭大量超抽地下水，因此要進行相關分析，魚塭面積的變化是重要線索。