2020-01-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/695072摘要：大屯火山群位於臺灣人口密度最高的台北盆地北緣，因此評估其活動性，是台北都會區自然災害的重要課題。為了解大屯火山群的活動性，近年來有很多學者對大屯火山群的地表變形以及地底下岩漿庫活動進行偵測。從研究結果可知，目前大屯火山群底下確實有岩漿庫的活動徵兆，如何偵測岩漿活動所引起的地表變形，是評估火山活動的重要的手段。本研究多時期和不同波段的雷達影像，利用永久散射體合成孔徑雷達差分干涉（PS-InSAR）技術，分析不同時期大屯火山群的地表變形。其中X波段波長較短、空間解析度較佳，L波段波長較長、穿透植被能力較佳，C波段居中。過去在山區的地表變形偵測上，多採取L波長（長波段影像），以期能夠取得較多的永久散射點（以下簡稱PS點）。大屯山區雖然植被茂密，但聚落的人造建物、公路和登山步道以及硫磺噴出口附近植被無法生長而有散射較佳的裸露岩層，可以取得足夠的PS點，進行時間序列分析，以此可用PS-InSAR取得不同時期的地表變形特性，藉此分析不同時期的大屯火山群地表形變狀況，並將成果與連續GPS以及相關資料的地表變形比對，觀察之間趨勢的差異，驗證以PS-InSAR技術能偵測山區地表變形之能力。本研究亦將嘗試將高解析度的數值地形，應用於InSAR處理，改進PS-InSAR技術偵測山區地表變形之能力，預期能夠監測大屯火山岩漿活動或熱液活動所引起之地表變形特徵，並用數值模式反演岩漿活動或熱液活動的位置和特性。<br> Abstract: Tatun Volcano Group is located near north margin of Taipei basin with highest dense population in Taiwan, thus the study of volcanic activity is a crucial issue for the assessment of volcanic hazards and risk mitigation in metropolitan Taipei area. In order to better understand the activity of Tatun Volcano Group, the monitoring of surface deformation and the detection of magma chamber have been carried out recently. Based on previous studies, the activity of magma chamber underneath of Tatun Volcano was confirmed. Thus how to monitor the surface deformation induced by volcanic activity play an important role on assessment of volcanic activity. In this study, we will use PS-InSAR technique to analyze the surface deformation in Tatun Volcano Group by using multi-temporal radar images with different wavelengths. Among the radar images, short-wavelength X-band radar image has high spatial resolution; the long-wavelength L-band radar could penetrate the dense vegetation cover. The spatial resolution and ability of penetration are compromised by using C-band radar image. In order to get much more persistent scatterers (hereafter as PS), the L-band radar images are often used in mountainous area for detecting surface deformation. Even though high dense vegetation is covered in Tatun mountain area, the buildings in the village, roads, trails and exposed outcrops around the fumaroles will act as the good corner reflectors and provide the enough PSs for time series analysis in PS-InSAR technique. Thus we will compare different result by applying radar images for deformation detection and characterize the surface deformation patterns in different period of Tatun Volcano Group. We also constrain and compare the InSAR-derived deformation with those from continuous GPS and related data to investigate the ability of detection in surface deformation form magma or hydrothermal activities. In addition, we will use high-resolution DEM to improve the InSAR processing and hope it helps the detection of deformation in mountainous area. Finally, we expect the PS-InSAR technique could detect the deformation induced by magma and hydrothermal activities and we use the surface deformation to inverse the location and characters of magma or hydrothermal activities.大屯火山永久散射體-合成孔徑雷達干涉技術GPS連續站水準測量Datun VolcanoPS-InSARCGPSLeveling