Interseismic deformation across the middle part of the Longitudinal Valley suture, eastern Taiwan
Date Issued
2014
Date
2014
Author(s)
Chin, Nien-Chi
Abstract
The Longitudinal Valley in eastern Taiwan is generally considered as the suture between the Philippine Sea plate and the Eurasian plate. Many historical large earthquakes occurred along this suture. The southern part of the Longitudinal Valley has attracted many studies, mostly due to the rapid-creeping Chihshang segment of the Longitudinal Valley fault. However, only a few detailed studies focused on the middle part of the valley. In order to understand the interseismic deformation patterns along the middle part of the Longitudinal Valley, we analyzed GPS (Global Positioning System) measurements and leveling results to obtain the velocity field and strain pattern of the area. We calculated the GPS velocity field from continuous stations installed by the Central Weather Bureau and Academia Sinica that have been measured in the past twelve years, as well as campaign-mode stations measured at least annually from 2003-2012. Our analysis is intended to understand the activities of the Longitudinal Valley fault and the Central Range fault in the Rueisuei and Yuli areas, in the middle part of the valley.
We calculated the velocity field and velocity cross-sections across the middle segments of the Longitudinal Valley fault and the Central Range fault, and derived interseismic dislocation model for these two faults using the data from GPS and leveling. The results show that the Rueisuei and Yuli areas are characterized by compressional deformation in northwest-southeast direction. In the northern Rueisuei area, the Central Range fault appears to have higher rates of reverse motion than in southern Rueisuei area. The Longitudinal Valley fault appears to have higher rates of both reverse and sinistral motions in the southern Rueisuei area. Our geodetic analysis provides new observations of interseismic deformation patterns of the middle segments of the Longitudinal Valley fault and the Central Range fault. These new observations will enable us to further understand the earthquake hazard potential of this part of the Longitudinal Valley suture.
Subjects
花東縱谷
震間變形
全球定位系統
縱谷斷層
中央山脈斷層
Type
thesis
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