集集大地震沿著車籠埔斷層發生，向南延伸至竹山、頂林處時，於雪山山脈末端產生了一條北偏西20度的地震帶。此地震帶在集集地震前並未存在，其地震的發生可能為集集地震後該區域應力的增加，使得八卦-東埔轉型斷層帶的再活動所造成。
研究此區域的地震活動性發現，依震源機制解可將地震的發生分為三個時期：集集地震前（1991～1999.9.20）、集集地震發生後約六個月內（1999.9.21～2000.3.31）及集集地震六個月後迄今（2000.4.1～2003.6.30），顯示地震機制在三個時期中有正斷層-左移斷層-正斷層之斷層型態轉換的變化。
此研究區域集集地震前之正斷層可能是由於板塊隱沒時部分上部地殼發生斷裂，其斷塊受浮力而隆起，或是板塊部分拆離所產生拉張應力環境所形成；而集集地震後之左移斷層則是八卦-東埔轉型斷層帶的再活動。此區地震型態的改變，是受到應力的累積與釋放所影響、控制。

After Chi-Chi earthquake occurred in 1999, a seismogenic belt with strike N20°W appears in southern Hsuehshan Range. The seismic belt is probably a result of the Pakua-Tongpu transfer fault zone reactivated by the stress increase after Chi-Chi earthquake.
We separate the seismic events into three stages: pre-Chi-Chi earthquake(1991～1999.9.20)、within six months after Chi-Chi earthquake(1999.9.21～2000.3.31) and post-six months after Chi-Chi earthquake(2000.4.1～2003.6.30). Results show change of the fault pattern ( Normal fault—Strike-slip fault—Normal fault ) in three stages.
We suggest that the normal fault before Chi-Chi earthquake was due to the exhumation from buoyancy of the upper subducted continental crustal slice, or the extension by slab break-off. The strike-slip fault after Chi-Chi earthquake was reactivations of the Pakua-Tongpu transfer fault zone.

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