臺灣位於歐亞板塊與菲律賓海板塊的交界帶，菲律賓海板塊在台灣東部向北隱沒，花蓮地區位於碰撞和隱沒的交界帶，因此有著較高的地震活動度和複雜的構造系統。地震活動度方面，根據中央氣象局(Central Weather Bureau , CWB)的資料，花蓮地區發生了數起致災性地震，包含1951年10月22日規模7.3的地震事件、2002年3月31日規模6.8的地震事件以及2016年2月6日規模6.26的地震事件，並且自2012年CWB改用連續紀錄起，花蓮地區在2012～2019年有紀錄的地震事件高達59000件。構造方面，根據前人研究，除了中央地質調查所(以下簡稱地調所)公佈的第一級活動斷層─米崙斷層、第二級活動斷層─嶺頂斷層之外，也有學者提出中央山脈東部斷層和大清水撕裂斷層等構造。本次研究中使用了GrowClust重新定位法，GrowClust是一種運用在地震的相對重新定位方法，利用地震事件波形的到時差和相關性來進行分群後進行重新定位。在本研究的成果中可以看到，地震事件的分佈更加集中且線性，藉此將花蓮地區的地下構造大致分為以下幾個部份：米崙斷層、嶺頂斷層、清水斷崖附近的逆斷層、中央山脈東側的高角度西傾逆斷層、大濁水溪口的逆斷層以及0206花蓮地震的主要孕震構造。

Taiwan is located at the boundary of the Eurasian plate and the Philippine Sea plate. The Philippine Sea plate subducts to east-north Taiwan. The Hualien area is located at the boundary of collision and subduction. Therefore, it has a high seismic activity and a complex tectonic system.
According to the Central Weather Bureau (CWB) data, several catastrophic earthquakes occurred in the Hualien area. The Hualien area has recorded as many as 59,000 earthquake events from 2012 to 2019. According to previous studies, in addition to Milun fault that the first-level active fault and Lingding fault that the second-level active fault announced by the Central Geological Survey, some scholars also proposed the eastern part of the Central Mountain Range Faults and Daqingshui tear faults and other structures.
The GrowClust relocation method is used in this study to relocate earthquakes for detailed seismogenic structures. GrowClust uses relative phase arrivals for high accuracy relocation. The relocated earthquakes reveal major fault systems in the region and can be roughly divided into the following parts: The Milun fault, the Lingding fault, the west-dipping reverse fault on the east side of the Central Mountain Range, the reverse fault at estuary of Dazhuoshui river, and the main seismogenic structure of the 0206 Hualien earthquake.

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