本研究聚焦於光纖陀螺儀(Fiber Optic Gyroscope, FOG)於地震旋轉運動觀測之應用，實地部署六軸光纖陀螺儀於台灣花蓮地區進行長期監測，探討其在地震事件與靜態觀測情境下的量測效能與穩定性。針對2024年509號與489號地震資料進行分析，結果顯示光纖陀螺儀於中高頻段展現良好的角速度解析能力，能明確捕捉震動過程中的旋轉能量，與傳統線性加速度計相比，在靈敏度與高頻穩定性方面具顯著優勢。 進一步於無地震事件之靜止時段，進行長達三小時的連續觀測，實測地球自轉角速度，其觀測值與理論值誤差約為17.6%，方向偏差約10.47度，顯示光纖陀螺儀具有量測極低角速度、穩定背景旋轉場之能力，並具備良好的方向穩定性與抗干擾特性。 未來若能進一步拓展至多點部署，形成旋轉感測網絡，或與建築物、橋梁等土木結構整合進行動態監測，將有助於提升結構健康評估與震動反應模擬之完整性，整體而言，光纖陀螺儀不僅是一種創新型感測設備，更具備在地震科學與工程應用中廣泛發展之潛力。;This study focuses on the application of Fiber Optic Gyroscopes (FOG) in monitoring rotational ground motions during earthquakes. A six-axis FOG was deployed in Hualien, Taiwan for long-term seismic observation to evaluate its performance and stability under both seismic and static conditions. Through analysis of seismic data from the 2024 No. 509 and No. 489 earthquakes, the FOG demonstrated excellent angular velocity resolution in the mid-to-high frequency range, effectively capturing rotational energy during ground motion. Compared to conventional linear accelerometers, the FOG showed significant advantages in sensitivity and high-frequency stability. Furthermore, during a three-hour quiet period with no seismic activity, the FOG successfully measured Earth’s rotational angular velocity. The observed value showed only a 17.6% magnitude deviation and approximately 10.47° directional deviation from the theoretical value, indicating the instrument’s capability to detect extremely low angular velocities and stable background rotational fields, with strong directional stability and noise resistance. Looking ahead, expanding the system to include multiple FOG units forming a rotational sensor network, or integrating it into structural health monitoring of civil infrastructure such as buildings and bridges, could enhance the completeness of dynamic response analysis and structural diagnostics. Overall, the fiber optic gyroscope proves to be not only an innovative sensing technology but also a promising tool in both seismic research and engineering applications.
