由全球衛星定位系統（GPS）作為觀測工具，對於地震造成的斷層錯動，因而引起地球內部具有黏彈性質之下部地殼與軟流圈受力後之區域地表震後的變形進行偵測。為瞭解震後位移場模式與餘震效應和板塊速度場等相互關聯性。運用斷層分段特性，將車籠埔斷層區分為五段，經由數值模擬的方式，改變控制模型輸入來計算震後地表理論變形量與主要之對應制約參數值為本研究之主要方法。
以一個鬆弛時間為單位之變化量討論整個研究區域，其震後黏彈性地表位移由南向北呈一匯流狀位移，在點位M402具有最大之水平位移50.39公分，G103有最小水平位移3.15公分。將車籠埔斷層下盤之位移量做約制發現上盤模擬之位移量較GPS觀測結果少，主要是因為主震區域因能量釋放造成地質材料受力而破壞鬆散，該區域由於地體構造影響在板塊持續由東南向西北方向位移的同時，集集地震主震的震央區域仍是應力聚集的焦點，而在震後短時間內應力持續作用因而造成地表大量位移，使得單純的震後錯動模擬量與觀測結果差異為最大，這種高位移模式持續的時間一旦結束將是本區域應力再次累積的開始。經由數值模擬與GPS成果比對，瞭解台灣中部地區軟流圈之鬆弛時間約為4.2-12.5年。

By analyzed the postseismic surface displacement pattern to study the relaxation time of lower crust and asthenosphere with numerical simulation; and also use the data acquired from Global Positioning System to compare with result of numerical simulation to study the difference between observation and simulation that caused by main shock, after shock or the velocity of plate motion, etc. In this article we divide the Chelungpu fault into five parts and each part has different parameters in rupture that also used as the control factor of numerical simulation.
According to the numerical simulation, we get the convergent pattern of postseismic displacement field from south to north, and the maximum horizontal displacement is 50.39 cm at the station of M402, while the minimum horizontal displacement is 3.15 cm at the station of G103 in a unit of relaxation time. Using measurements from the footwall of the Chelungpu fault as controlling parameter, the simulation at hanging wall has less value than observation. It suggests a great deal of stress release resulting from the geological material loosen and easy to be deformed at postseismic stage. In addition, when the plate continue moves from southeast to northwest, the regional concentrative stress still focus on the Chi-Chi area. Thus the reason, we have got a larger variation between observation and simulation in this vincity. Whenever the postseismic displacement pattern stop, the stress accumulation will act on again with time spin increases. With the observation and simulation, it is found the relaxation time of asthenosphere of the region is about 4.2-12.5years.

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