臺灣位於高地震活動區域。全球定位系統(GPS)已經顯示可測量出地殼板塊變動。在得到變動量，以每日網路解方式證實為一可靠的方式。集集大地震重創了全島，並引發劇大地表變動。本研究的主要目標是尋找一種簡單的資料處理方法，能及時計算出變動量。
為了快速去獲取集集大地震引起的變動，使用了中央氣象局的GPS資料，並採用兩種方法。第一種可稱為”無重疊解”，此解法是以相等的資料範圍，且在資料區段上並沒有重疊。總共有三種資料範圍，分別是兩小時、一個半小時和一小時。而第二種則為”重疊解”，並以一個半小時和一小時的相等資料區段下解算。每各資料區段上為每隔十五分鐘重疊。
結果顯示兩小時和一個半小時解是足夠正確地去監測變動，而一小時解則有太大的誤差量。而以重疊解方式，能夠在短時間內提供解決辦法。因此，在本例中變動量能夠在十五分鐘監測出來。

Taiwan locates in the area of high earthquake activities. The Global Positioning System (GPS) has been shown of measuring crustal deformation. The daily network approach has been proved to be a reliable method in obtaining the deformation. The Chi-Chi Earthquake stroked the island and induced a large surface deformation. The main goal of this research is to find a simple data processing approach to compute the deformation in time.

In order to quickly obtain the deformation caused by Chi-Chi Earthquake with using Central Weather Bureau (CWB) GPS data, there are two approaches have been adopted. The first one is called "non-overlapped" in which the data is processed with equal data span and is no overlapped in data sets. There are three data spans of two hours, one and one half hours, and one hour. The second one is referred to as "overlapped" so that the overlapped data is processed with equal data span of one and one half hours. An overlapped data of fifteen minutes is applied to each data set.

The results show that two-hour as well as one-and-one-half-hour solutions are accurate enough to monitor the deformation while the one-hour solution has much higher error. The overlapped approach is capable of providing the solutions with much short intervals. As a result, the deformation can be monitored in fifteen minutes in this case.

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