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Rou-Fei Chen Yu-Chang Chan Jacques Angelier Jyr-Ching Hu Chung Huang Kuo-Jen Chang Tian-Yuan Shih 《Comptes Rendus Geoscience》2005,337(13):1164-1172
The 1999 Chi-Chi earthquake triggered the catastrophic Tsaoling landslide in central Taiwan. We mapped the landslide area and estimated the landslide volume, using high-resolution digital elevation model from airborne LiDAR (Light Detection and Ranging), satellite images, aerial photographs and topographic maps. The comparison between cut and fill volumes, about 0.126 and 0.150 km3, respectively, suggests a volume increase of 19% due to decompaction during landsliding. In April 2002, the cut and fill volumes were about 0.137 and 0.116 km3, respectively. These estimates suggest that 2.5 years after the event, the volume of landslide debris removed by river erosion was nearly 0.045 km3. Such a large value highlights the importance of landslide processes for erosion and long-term denudation in the Taiwan mountain belt. To cite this article: R.-F. Chen et al., C. R. Geoscience 337 (2005). 相似文献
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Coseismic deformation revealed by inversion of strong motion and GPS data: the 2003 Chengkung earthquake in eastern Taiwan 总被引：2，自引：0，他引：2
Jyr-Ching Hu Li-Wei Cheng Horng-Yue Chen Yih-Min Wu Jian-Cheng Lee Yue-Gau Chen Kuan-Chuan Lin Ruey-Juin Rau Hao Kuochen Hui-Hsuan Chen Shui-Bei Yu Jacques Angelier 《Geophysical Journal International》2007,169(2):667-674
A moderate earthquake of M w = 6.8 occurred on 2003 December 10. It ruptured the Chihshang Fault in eastern Taiwan which is the most active segment of the Longitudinal fault as a plate suture fault between the Luzon arc of the Philippine Sea plate and the Eurasian plate. The largest coseismic displacements were 13 cm (horizontal) and 26 cm (vertical). We analyse 40 strong motion and 91 GPS data to model the fault geometry and coseismic dislocations. The most realistic shape of the Chihshang fault surface is listric in type. The dipping angle of the seismic zone is steep (about 60°–70°) at depths shallower than 10 km and then gradually decreases to 40°–50° at depths of 20–30 km. Thus the polygonal elements in Poly3D are well suited for modelling complex surfaces with curving boundaries. Using the strong motion data, the displacement reaches 1.2 m dip-slip on the Chihshang Fault and decreases to 0.1 m near surface. The slip averages 0.34 m, releasing a scalar moment of 1.6E26 dyne-cm. For GPS data, our model reveals that the maximal dislocation is 1.8 m dip-slip. The dislocations decrease to 0.1 m near the surface. The average slip is 0.48 m, giving a scalar moment of 2.2E26 dyne-cm. Regarding post-seismic deformation, a displacements of 0.5 m were observed near the Chihshang Fault, indicating the strain had not been totally released, as a probable result of near-surface locking of the fault zone. 相似文献
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Qiang Chen Guoxiang Liu Xiaoli Ding Jyr-Ching Hu Linguo Yuan Ping Zhong M. Omura 《International Journal of Applied Earth Observation and Geoinformation》2010
A method for tightly integrating GPS observations and the persistent scatterer (PS) interferometric synthetic aperture radar (InSAR) is proposed to detect vertical ground motion in Hong Kong, China. The tropospheric zenith wet delays (ZWD) derived from GPS observations at sites in the SAR scenes are used first to model and correct for the tropospheric effects in the interferograms generated from the SAR images. The vertical motion rates (VMR) of the GPS sites determined based on the continuous GPS observations obtained at the sites are then used as constraints in the PS InSAR solutions to further enhance the quality of the solutions. Data from 12 continuous tracking GPS sites in Hong Kong and 8 ENVISAT ASAR images acquired during 2006–2007 are used to demonstrate the application of the proposed method. The results from the example show that the method is capable of detecting accurately the vertical ground motion. 相似文献
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Chin-Shyong Hou Jyr-Ching Hu Li-Chung Shen Jing-Suei Wang Chien-Liang Chen Tien-Chang Lai Chung Huang Yi-Rong Yang Rou-Fei Chen Yue-Gau Chen Jacques Angelier 《Comptes Rendus Geoscience》2005,337(13):1184-1193
Four years of GPS measurements were done since 1996 in southwestern Taiwan in order to investigate crustal deformation and land subsidence. The network of 48 stations revealed the velocity field in the Pingtung Plain. Horizontal velocities range from 31 to 54 mm?yr?1 towards azimuths 247° to 273°. They show clear anti-clockwise deviation in the coastal area, consistent with tectonic transtension related to lateral escape at the transition collision–subduction. The deformation resembles a particle flow towards a free boundary, and is not a rigid rotation. Vertical velocities range from +13 to . Twenty stations show fast subsidence in the coastal area, with rates averaging . The comparison with Holocene subsidence suggests that about 75% of the present-day subsidence result from decreasing groundwater level induced by over-pumping, adding significant short-term component to the natural risk resulting from long-term tectonic subsidence. To cite this article: C.-S. Hou et al., C. R. Geoscience 337 (2005). 相似文献
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Project of monitoring of the fault activity using 3-component Gladwin Tensor Strainmeter (GTSM) was initiated by the Central Geological Survey in October 2003. These instruments are intended to supplement the deformation observations from the continuous GPS arrays as part of a systematic program of plate boundary observation across Taiwan orogenic belt. 相似文献
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David Ching-Fang Shih Yih-Min Wu Jyr-Ching Hu 《Stochastic Environmental Research and Risk Assessment (SERRA)》2010,24(5):705-711
Captured CO2 could be deliberately injected into the ocean at great depth, where most of it would remain isolated from the atmosphere
for centuries. CO2 can be transported via pipeline or ship for release in the ocean or on the sea floor. In Taiwan, CO2 release is preliminarily projected from 2010 to 2030 in an average amount of 6.957 Gt within this duration. If deep sea sequestration
for CO2 can be the possible option in Taiwan, it seems to exists possible potential area delimited between 122.0°E to 122.5°E and
21.8°N to 22.3°N for CO2 sequestration on account of its isolated and flat topography. Apparently, the area to the southeast of Taiwan is found to
reach a depth deeper than −3,000 m and can be taken as a testing area for pilot studies. This study searches the area using
the contours from the depth of −4,554 to −5,500 m with 1-m interval; the area, topographic volume, maximum mean height (volume/area),
and ocean volume are reported. If the emission rate is kept constantly, for 20-year storage it needs 3 m of thickness reaching
the sea ridge at the depth −4,554 m using top-down style; for 100 years of storage it needs 12 m. On the other hand, if it
accounts for the bottom the sea floor is taken as the reference and the accumulated CO2 is stored from the depth at −4,900 m using bottom-up style, it requires about 37 m for the 20-year storage and 61 m for one
decade. 相似文献
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时序雷达干涉图中的永久散射体(PS)可看作“天然GPS点”, 以构成网络用于监测长期的地表形变. 本文提出采用邻接矩阵拓扑模型对基于Delaunay剖分算法生成的PS网络进行基线识别, 并采用时序相干最大化算法求解PS基线的线性形变速度增量和高程误差增量. 该数据模型和计算方法被应用于探测香港地区2006~2007年间的区域地表沉降. 实验研究采用由Envisat卫星ASAR传感器对该地区成像所获取的时序SAR影像作为数据源, 并联合该地区12个GPS连续运行参考站的观测数据予以大气修正和地面控制. 实验结果表明, 该模型和方法应用于地表形变测量是有效的和可靠的, PS网络方法探测地面沉降的精度约为±2.0 mm/a. 相似文献