台灣東部位於菲律賓海板塊與歐亞板塊之交界處，地震活動頻率高，而位於花蓮海岸平原的米崙斷層在2018年2月6日發生Mw6.4的地震，發生地表錯動造成嚴重災情。2018年地震發生後，此區域做了許多研究;從GPS與DInSAR同震變形觀測結果顯示有兩處地盤抬升，分別為米崙台地及吉安光華地區，從餘震分布及其層析成像，發現兩條東西向高速岩體上升到接近地表，從海底地形與地震發生位置可以推測米崙斷層為被動觸發而活動。
本研究在花蓮海岸平原使用震盪震源車及240波道震測系統，進行高解析反射震測，野外施測參數為震源間距16公尺、測站間距4公尺、頻寬範圍30-160Hz，相較於探油震測有更佳的解析度。野外震測隊於2019年與2020年分別布設6條及3條測線，分別位於七星潭及吉安地區，每條測線長度約2~4公里，紀錄時間2秒，經資料處理後可得深度約為3公里。
結果顯示七星潭測線可看見測線東邊米崙台地地下構造為背斜構造，在西邊北埔平原(機場)則地層呈水平，二者交界處顯現出明顯的斷層邊界，相同位置可能有兩條斷層;包括西傾的「縱谷斷層」及東傾的「米崙斷層」。吉安地區測線可看出 在200公尺以下地層明顯隆起的現象。根據震測結果，可以推論在米崙台地及吉安區都有隆起的背斜構造，可能為地震發生時向南破裂，能量當遇到東西向障礙，遂引發隆起，造成米崙隆起及吉安光華隆起。

The eastern part of Taiwan is located at the junction of the Philippine Sea plate and the Eurasian plate, the frequency of seismic activity is high. An Mw6.4 earthquake occurred on February 6, 2018 and caused dominant seismic hazard along the Milun Fault located in the Hualien Coastal Plain due to ground movement. After the earthquake occurred in 2018, many studies have been done in this area, and the co-seismic deformation observation results from GPS and DInSAR showed that there are two ground uplifts, namely the Milun tableland and the Ji'an area. From the distribution of aftershocks and their tomographic image, two high-speed east-west rock masses were found to rise close to the ground surface. From the seabed topography and the location of the earthquake, it can be inferred that the Milun fault is passively triggered.
In this study, a vibroseis source and a 240-channel seismic system were used in the Hualien Coastal Plain to conduct high-resolution reflection seismic surveys. The field measurement parameters include the source spacing 16 meters, the station spacing 4 meters, and the frequency range 30-160 Hz. It has better resolution than the seismic survey of petroleum exploration. The field seismic survey team deployed 6 and 3 survey lines in 2019 and 2020, respectively, located in Qixingtan and Ji’an areas. Each profile is about 2 to 4 kilometers long and the recording time of 2 seconds. After data processing, the available depth is 3 kilometers deep.
The results show that the Qixingtan profile can show the anticline structure under the Milun tableland in the eastern part of profile, and the horizontal stratum under the Beipu Plain (airport) in the western part of profile. The two junctions show obvious fault boundaries, which are interpreted as two fault system at the same location, including West-dipping Longitudinal Valley Fault and East-dipping Milun Fault. It can be seen from the survey line in Ji'an area that the layer is slightly uplifted below 200 meters. The results of seismic survey show that there are uplifted anticlines in the North Milun tableland and the Ji'an area, which may have ruptured southward are the earthquake occurred, and the energy propagation encountered an east-west obstacle, which triggered an uplift, in the Milun uplift and the Ji'an uplift.

學位考試委員會審定書
致謝
中文摘要 i
Abstract iii
目錄 v
圖目錄 vii
表目錄 xi
第一章 緒論 1
第二章 研究區域概述 23
第三章 研究方法 37
第四章 震測地層剖面結果 49
第五章 討論與結論 63
參考文獻 71

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