本研究之目的為利用美國地質調查所﹙U. S. Geological Survey，USGS﹚於1999年提出之新的災害評估技術—ShakeMap震度圖，以此求得集集地震序列台灣各地地動震度分布的情形，並進一步分析ShakeMap震度隨距離之衰減關係，以瞭解各地之地動特性。此外也希望能建立起震度與災害之間的關係，提昇以地震震度做為震災評估參數的可行性。
ShakeMap震度與地動峰值的關係式為：
I = 3.66㏒(PGA)－1.66 ( V ≦I ≦ VIII，σ= 1.08 ) (公式1)
I = 3.47㏒(PGV)＋2.35 ( V ≦I ≦ IX，σ= 0.98 ) (公式2)
I = 2.20㏒(PGA)＋1.00 (IX ≦I ≦ V) (公式3)
實際應用上，MMI震度VII以上使用公式2，MMI震度V以下使用公式3，MMI震度V和VII之間則使用公式1和2，採權重方式計算，便可得到以地震記錄換算而來的MMI震度值。
本研究內容分為兩部分，第一部分利用中央氣象局及中央研究院提供之強震記錄，探討集集大地震序列中台灣地區的地動震度分布及其特性；第二部分將集集大地震的災情統計資料與本研究之ShakeMap震度做比較，研究地震震度與地震災害之間的關係。
由本研究結果可以獲得下列幾點結論：
1.Wald et al.(1999a)結合PGA、PGV估計ShakeMap震度之方法則優於僅使用PGA或PGV所得到的震度分布型態，因此本研究也採用此法。
2.集集主震為大規模斷層錯動破裂的地震，對地震動的斷層效應明顯表現出兩大特性，即以車籠埔斷層為主軸，震度分布呈東強西弱、北強南弱。前者乃因逆衝斷層型態所致，而後者則因斷層破裂由南向北擴大所引起。
3.整體說來，集集餘震序列、嘉義地震及瑞里地震的震度分布在接近震央的地區會有大致以震央為圓心之震度往外呈同心圓擴散的現象，最高震度可能會受震源機制甚至深度的影響而偏向一邊，震度分布的空間型態也可能會因為震源機制而有所不同。
4.本研究分別取整數型態及實數型態之震度值與距離進行廻歸分析，發現集集主震以最近斷層面距離的廻歸關係式均較以震源距離廻歸者為佳。此外亦發現震度取整數值進行廻歸分析時的結果比使用實數型態的震度得到的廻歸關係式差。
5.由主震得到的殘差值可以反映出其斷層效應，利用集集餘震序列、嘉義地震及瑞里地震得到之各地平均殘差值基本上可以反映出不同地區之場址特性。
6.經由集集主震的ShakeMap震度圖與中部地區實際的房屋倒塌及死亡分布情形相對照，顯示ShakeMap震度在反映實際災情方面有不錯之效果，統計結果顯示，在MMI震度VII便會開始發生較為嚴重的房屋全倒率，本研究進一步分析得到不同Mw規模5.7～7.6與ShakeMap震度VII以上之面積的關係式，用此關係式可於強震發生時快速推估可能的災區面積，若能進一步配合ShakeMap震度圖對於緊急救災應會有所幫助。

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