構造轉換帶可以代表單一斷層的構造上的轉換，且透過研究褶皺的形貌，可以預測鄰近淺部水平地層最終受到深部斷層向上滑移時，地層被侵蝕的形貌。本研究區域位於新竹苗栗地區，根據中油地質圖所繪製之斷層，由北而南分別為東－西走向的新竹斷層與斗煥坪斷層，和東北－西南走向的新城斷層、竹東斷層、北埔斷層與鹿廚坑斷層；其中新城斷層伴隨寶山背斜，並且在地下分支為兩條斷層，北端以新竹斷層為界，南端以斗煥坪斷層為界；而鹿廚坑斷層位於斗煥坪斷層的南側伴隨永和山背斜，斗煥坪斷層向東延伸又連接竹東－北埔斷層及其上盤的竹東背斜。
台灣西北部新竹苗栗地區為台灣重要科技產業所在地，該區域的活動斷層研究更為重要，故本研究目的在探討竹苗地區早期正斷層與後來發育之逆衝斷層兩者相互銜接關係，以及斷層面上下盤地層截切線的變化，並分析轉換帶處褶皺軸面的變化。本研究結合前人研究與本研究所繪製平衡剖面，並運用SUKA-GOCAD建置斷層、地層及褶皺軸面地下三維模型，提出轉換帶的特徵。
透過三維構造模型建置，同時修改二維的構造平衡剖面，能增加構造平衡剖面的準確性，提供不同的構造思維。本研究提出兩種構造轉換帶相關褶皺分別為，早期正斷層反轉之橫移斷層相關的褶皺，以及低傾角逆衝斷層之間隨斷層深度改變所形成的褶皺，前者靠近橫移斷層其構造走向轉為東北–西南向，褶皺軸面寬度變窄，褶皺有變緊密的趨勢，且斷層深度由南而北逐漸變淺。後者番婆坑背斜–永和山背斜走向由東北–西南向轉為北北東–南南西，反應出斷層滑移面深度由淺變深，此變化亦可於軟橋斷層中觀察到。

The Hsinchu-Miaoli areas are the most important semiconductor industry base and also characterized by complex fold-and-thrust belt in northwestern Taiwan. It’s critical to figure out where the active faults might rupture and whether they would cause damage to the areas in the future.
Basically there are two different types of faults in the Hsinchu-Miaoli areas: E-W striking high-angle and NE-SW striking low-angle thrust faults. These faults also are accompanied by several folds. In this study, we first use the geological maps published by Chinese Petroleum Corporation (CPC) to reveal fault linkage in the subsurface. Through a series of balance-cross sections we build a reasonable 3D geometry of fold-and-thrust system with SKUA-GOCAD and modified some of the balance-cross sections. With the 3D geometry, we proposed some modes of faults and related folds in the final.
In summary, the 3D geometry reconstruction is effective to refine the well-established balance-cross sections and bring brand new insight of the subsurface structure. We propose two fault-related fold modes in the structural transfer zones (STZ) in our study area: 1, the folds related with reactivated faults in STZ would change their strikes and become tighter; 2, the folds developed in the place where slip depth of low-angle thrust changes from shallower to deeper would change fold strike from NE-SW to NNE-SSW.

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