The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part Bl. Beijing 2008
150
Figure 4. Correlation between annual subsidence rates
determined based on GPS and InSAR measurements over 2005
- 2006. The points marked with asterisk are GPS' stations set up
for ground fissure monitoring.
4. CONCLUSIONS
Results from ERS and Envisat InSAR measurements over 1992
- 2007 have shown that the ground subsidence in Xian was
significant over this period of time. The subsidence rate
increased from 1992 to 1996, and then decreased from 1996 to
2004 and the main subsidence areas shifted to the newly
developed suburbs. The subsidence was correlated spatially to
the distribution of the ground fissures and the CAF, and to
ground water withdrawal.
Li, ZW., Ding, X.L., Huang, C., Zheng, D.W., Zou, W.B. and
Shea, Y.K., 2006, Filtering Method for Radar Interferogram
with Strong noise, International Journal of Remote Sensing,
27(14): 2991-3000.
Peng, J.B., Su, S.R. and Zhang, J., 1992, The Active Faults and
Geohazards in Weihe Basin, Northwest university Press, Xian.
Scharroo, R., Visser, P.N.A.M., and Mets, G.J., 1998, Precise
orbit determination and gravity field improvement for ERS
satellites, Journal of Geophysical Research, 103(C4):
8113-8127.
Suo, C.M., Wang, D.Q., Liu, Z.Z., 2005, Land fracture and
subsidence prevention in Xian, Quaternary Research, 25(1):
23-28.
Tao, H., 1999, The Land Subsidence Map of Xian City, in Xian
Environmental Geological Atlas, Xian Mapping Press, Xian.
Wang, J.M., 2000, Theory of Ground Fissures Hazards and Its
Applications, Shaanxi Science and Technology Press, Xian.
Xian City Planning Bureau, 2006, Regulations of Field
Reconnaissance and Engineering Design of Xian Ground
Fissures, Institute of Geotechnical Investigation and Design
MMI and China Northwest Building Design Research Institute,
Xian City Planning Bureau, No. DBJ61-6-2006.
Yan, W.Z., 1999, Xian Ground Fissures Map, in Xian
Environmental Geological Atlas, Xian Mapping Press, Xian.
Yi, X.F., Su, G., Wang, W.D. and Tang, J.C., 1997, Basic
characteristics of the fissure zones in Xian and their causative
mechanism, Seismology and Geology, 19(4): 289-294.
Zhang, J.M., 1990, Research on Ground Fracture in the Region
of Xian, Northwest University Press, Xian.
ACKNOWLEDGEMENTS
The SAR data were provided by ESA under two Category 1
projects. The research was financially supported by a Key
Project of the Natural Science Foundation of China (NSFC)
(Project No: 40534021), a general project of the NSFC (Project
No: 40672173), a Key Project of the Ministry of Land &
Resources, China (Project No: 1212010440410), and by the
Research Grants Council (RGC) of the Hong Kong Special
Administrative Region (Project No.: PolyU 5161/06E).
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