Erratum to: Integration of GPS with InSAR to monitoring of the Jiaju landslide in Sichuan,China |
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| Authors: | Yueping Yin Wamo Zheng Yuping Liu Jialong Zhang Xiaochun Li |
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| Institution: | (1) China Geological Survey, 45 Fuwai Dajie, Xicheng District, Beijing, 100037, China;(2) Chengdu Institute of China Geological Survey, 2 Beisanduan, Yihuanlu, Chengdu, 610081, Sichuan Province, China |
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| Abstract: | In 2006, a cooperation project between China Geological Survey and the Geological Survey of Canada started the monitoring
of the landslide along the deep-cut valley in the western Sichuan using integrated GPS and InSAR observation at the Jiaju
landslide. Both GPS and InSAR techniques provided complementary measurements with the GPS providing horizontal movement and
InSAR providing vertical motion. Meanwhile, InSAR images demonstrate also an effective tool to recognize new landslides in
complex steep mountain region. The GPS observations provide continuous monitoring data while InSAR data provide monthly measurements.
The differential InSAR results show a deformation information that divided the Jiaju landslide to two areas, the north and
south parts. The north part is sliding greater than the southern part in spatial domain. The sliding was faster in 2008 than
that in 2006 in time domain, suggesting a gradual increased acceleration over time. The GPS displacement data during the past
2 years show the northern part slid horizontally 55–207 mm/a and vertically −23 mm/a, while the southern part slid horizontally
12–34 mm/a; and the vertical displacement mainly moved downward 0.05 to 12 mm/a. On average, the observations from December
of 2006 to January of 2008 indicate that the northern part is sliding at 41.6 mm/a horizontally and 43.9 mm/a vertically,
while the southern part is sliding at 16.1 mm/a horizontally and 17.5 mm/a vertically. The data acquired through the GPS and
InSAR are generally comparable. Geological survey revealed some secondary landslides, cracks, and fissures within the deformation
of the Jiaju landslide that could be induced by following factors: surface water drainage, river erosion, and slope cutting
and overloading. |
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