台灣為歐亞大陸板塊與菲律賓海板塊的呂宋島弧斜碰撞所產生之島嶼，在同一時間展現不同造山運動的演化階段。其中以台灣南部海域地體構造為初期弧陸碰撞（Initial arc - continent collision）。至今前人對於台灣東南海域的解釋較多是利用震測剖面，僅能看到10公里內較淺層的構造，對於深部的活動斷層還沒有足夠的解釋，因次我們的目的是利用地震分布位置來判斷更深層的發震構造和構造特性。本研究利用中央氣象局（CWB）的地震目錄資料，選取發生在台灣東南海域初期碰撞地區之地震資料，採用氣象局地震目錄挑選的P波及S波到時，及波形交叉比對（cross-correlation）求得地震間P波、S波的相對到時差，利用hypoDD重新定位後可得到更精確的地震相對位置。為了解初期弧陸碰撞的發震構造（seismogenic structure），本研究挑選芮氏規模（ML）大於 3.5的地震事件，濾波後挑選信噪比較大的P波、S波及表面波，採用波形反演求解地震震源參數，避免P波初動解誤判的缺點，我們的方法可提供更精確震源機制解，判斷斷層與構造來分析幾個區域的活動斷層。
本研究結果顯示，在綠島東北部深度約10~25公里處有向東傾逆斷層；台東峽谷與台東海槽交界在深度約0~30公里處，有高角度向東北傾的右移斷層；綠島西邊的台東海槽內部，深度約20~30公里處有向東傾的逆衝活動斷層，其延伸位置可能為往西邊靠近台東，往北可跟花東縱谷連接，越靠近陸地斷層角度越高，深度變淺。

Our study is aim to obtain the characteristics of the seismogenic structure in the geometric space. The stations in Taiwan are densely distributed, and seismic data are available in both Lutao and Lanhsu. When we’re selecting P-wave and S-wave arrival time with the earthquakes catalog from Central Weather Bureau Seismic Network (CWBSN), we can improve the accuracy of relative travel time difference by calculating the cross-correlation of their travel time difference. We use Double-Difference Relocation (HypoDD) to provide a more accurate relative position of the earthquake. And the earthquake magnitude greater than 3.5 is selected. And we inverse the hypocenter parameter (including the time, location, depth, and seismic moment) with the waveform generated by the three-dimensional velocity model. Relative to the one-dimensional velocity model currently used by the meteorological bureau, this method can get more accurate focal mechanism.
Finally, the spatial distribution linear structure of the relocated seismic source is integrated to determine the fault plane of the focal mechanism to analyze the seismogenic structure of the southeastern Taiwan. The purpose of this research is to understand the seismogenic structure and structural characteristics of the initial arc-continent collision in southeastern Taiwan by verifying the results of previous studies and comparing the main active fault space and depth.

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