本研究主要是利用永久性散射體差分干涉法(PSInSAR)分析ERS 與ALOS衛星影像，同時亦採用GPS速度場進行分析菲律賓斷層鎖定至潛移過渡帶之活動特性，藉此來了解走向滑移斷層累積與釋放能量之機制。依據萊特島PSInSAR升軌道及降軌道之跨斷層LOS速度剖面分析指出，菲律賓斷層在萊特島由北至南大致可分為四個區段，由距離萊特島嶼最北端(0 km)起算，可分為A區(0-40 km)、B區(40-60 km)、C區(70-100 km)及D區(110-140 km)。A區ERS降軌道與ALOS升、降軌道跨斷層速率變化分別為22.7 mm/yr, 2.5 mm/yr及7.8 mm/yr，為潛移區段；B區之ERS降軌道與ALOS升、降軌道跨斷層速率變化皆趨近於零，故判定是鎖定區段；C區ERS降軌道與ALOS之升、降軌道跨斷層速率變化分別為31.7 mm/yr, 2.3 mm/yr及3.7 mm/yr；D區之ERS降軌道與ALOS升、降軌道跨斷層速率變化皆趨近於零，故亦判定是鎖定區段。本研究PSInSAR成果顯示北部萊特島之潛移區段分布與前人研究之野外調查成果相符合。然而，本研究PSInSAR成果與前人研究之InSAR與野外調查成果皆尚未發現南部萊特島的潛移證據。此外，跨越菲律賓斷層之GPS速度剖面分析可得知，菲律賓斷層為左移走向滑移斷層，其速率差約為34 mm/yr，與過去26 ± 10 mm/yr之斷層滑移速率評估結果大致上符合。最後，本研究利用四元樹切割(quadtree)有效降低PSInSAR成果之PS點數量，以未來應用於塊體模型同時逆推PSInSAR成果與GPS速度場，推斷出菲律賓斷層萊特段之幾何參數及其斷層滑移量分布情形，以對應斷層累積與釋放之能量盈虧，並加以進行應力分析，了解具潛力發生地震之位置以預防災害。

We analyze the data from Persistent Scatterers Interferometry (PSInSAR) and GPS data to understand the kinematic characteristics of the transition from creeping to locked segments of the Philippine strike-slip fault in the Leyte Island. Because the accumulation of seismic moment may be released by fault creep, analysis of fault kinematics also helps us to re-evaluate the earthquake hazard. PSInSAR technique is used for analyzing ERS and ALOS satellite images. According to the characteristics of ascending and descending LOS (line of sight) velocity profiles, the Philippine fault in the Leyte Island can be divided into four segments from north to south: A region (0-40 km), B region (40-60 km), C region (70-100 km) and D region (110-140 km). Regions A and C are proposed to be creeping segments, while regions B and D are locked segments. In region A, the velocity differences across the Philippine fault are about 22.7 mm/yr, 2.5 mm/yr, 7.8 mm/yr in ERS descending, ALOS ascending, and ALOS descending velocity profiles respectively. In region C, the velocity differences across the Philippine fault are about 31.7 mm/yr, 2.3 mm/yr, 3.7 mm/yr in ERS descending, ALOS ascending, and ALOS descending velocity profiles. The distribution of creeping segments of the Philippine fault in northern Leyte derived from PSInSAR is similar to the field surveys in previous studies. However, in the southern part of Leyte, no creeping evidence is shown by InSAR study and field investigations so far. In addition, GPS velocity field indicates that the Philippine fault acts as left-lateral strike-slip faulting. The velocity difference across the fault is about 34 mm/yr, which consistents with the previous GPS measurements, 26 ± 10 mm/yr. We apply the quadtree algorithm for modeling application, the block model will be adopted to invert the PSInSAR and GPS simultaneously for the fault geometry parameters and slip distribution of the Leyte segment of the Philippine fault. From the modeling results, we will infer the earthquake potential to prevent from the disasters.

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