藉由中央氣象局短週期地震站於自1991年1月至2002年9月間於台灣西南部所記錄19290筆ML≧1之地震資料，依據地震分布特性，將台灣西南部地區分為嘉義、瑞里、大埔、東南區、北區及西區等六個區塊。並進行雙差分地震重新定位法和三維地震重新定位、震源機制解推求（ML≧3.5共283個），及應力反演等分析，協助我們確認嘉南地區發震構造之幾何形貌及位置，並評估各發震構造之最大地震潛能。
　　研究結果顯示：(1) 集集地震前，嘉義、瑞里地區之應力狀態由於受到先前存在正斷層之幾何形貌及斷層走向影響，故σ2、σ3交錯分佈呈現帶狀形貌（gridle），其σ2及σ3的值因相當接近而易發生主應力軸互換；集集地震後，應力系統發生改變，σ2位於垂直地表方向，應力狀態呈走向滑移型態。(2)以北緯23.4o為界分析南北之應力反演結果，北群地震所得最大主應力軸σ1之方位角為130o，南群地震則為110o，此結果反映地殼尺度之最大主應力軸隨當地構造走向之變化而旋轉。(3) 嘉義南側深度4-17公里處存在一向西傾斜，傾角30o之逆斷層，斷層面積評估為128平方公里，潛在可發生之最大地震規模為Mw 6.2；北側則存在斷層面近乎垂直之走向滑移斷層，斷層面積評估為500平方公里，最大地震規模為Mw 6.7。(4) 觸口斷層北段之斷層特性為深0-10公里，傾向朝東，傾角40o之逆斷層，斷層面積評估為216平方公里，最大地震規模為Mw 6.4。(5) 大埔地區深約10-18公里處，存在一向西傾斜，傾角35o之逆斷層，斷層面積為160平方公里，最大地震規模為Mw 6.3。(6) 東南地區深約15-20公里處，存在一向西傾斜，傾角40o之逆斷層，斷層面積評估為36平方公里，最大地震規模為Mw 5.7。
　　由於台灣西南部深度十公里以下之地震活動相當頻繁，而大量向西傾斜之逆斷層的發育，極可能反應原先存在正斷層之再活動。因此，除了持續對已知活動構造進行監測外，滑脫面（detachment）以下之發震構造亦需進一步之研究，以求台灣西南部地震地體構造研究之完整性。

We analyze earthquake data in southwestern Taiwan from Central Weather Bureau between January 1991 and September 2002 and relocate earthquake locations by using 3D velocity model and double difference location method base on the 1D velocity model of our study area. Using 3D earthquake relocations to determine 283 focal mechanisms (ML≧3.5) and corresponding stress inversions. Finally we estimate earthquake potentials of those seismogenic structures in southwestern Taiwan.
We suggest that: (1) the stress patterns inverted from focal mechanisms exhibit that distributions of σ2 and σ3 axes are random within a shape of belt (girdle) in Chiayi and Rueyli area before Chi-Chi earthquake. The permutations between principal stress axes σ2/σ3 occurred because the horizontal stress decreased after Chi-Chi earthquake. (2) The results of stress inversions were divided into north and south earthquake clusters by N23.4o. The azimuth of principal stress axis σ1 in north cluster is 130o and the σ1 in south cluster is 110o. It appears that the maximum principal stress axes are perpendicular to strikes of local structures. (3) A 30o west-dipping reverse fault in depth of 4~17 km is in south of Chiayi, estimate of fault area is 128 km2 and the largest magnitude is Mw 6.2; a 80o south-dipping strike-slip fault is in north of Chiayi area, estimate of fault area is 500 km2 and the largest magnitude is Mw 6.7. (4) The northern segment of Chukou fault is a 40o east-dipping reverse fault in depth of 0~10 km, estimate of fault area is 216 km2 and the largest magnitude is Mw 6.4. (5), A 35o west-dipping reverse fault is in Dapu area, estimate of fault area is 160 km2 and the largest magnitude is Mw 6.3. (6) A 40o west-dipping reverse fault in depth of 15~20 km is in Southeast area, estimate of fault area is 36 km2 and the largest magnitude is Mw 5.7.
Hypocenteral depths of most earthquakes in southwestern Taiwna are deeper than 10 km according to the relocation results. West-dipping reverse faults are caused by the reactivations of pre-existing normal fault. Therefore, we need to clarify the structures beneath the detachment further, besides monitoring active faults in the upper crust.

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