Technology and Methodology |
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Coseismic Deformation Field Characteristics and Rupture Model for Gaize Earthquakes in Tibet |
HONG Shun-ying 1,2, LIU Zhi-rong 3, DAI Ya-qiong 2, SHEN Xu-hui 2,
SHAN Xin-jian 1, JING Feng 2 |
1.Institute of Geology, China Earthquake Administration, Beijing 100029,China;
2.Institute of Earthquake Science,China Earthquake Administration, Beijing 100036,China;3.Institute of Disaster Prevention
Science and Technology, Beijing 101601,China. |
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Abstract Through differential interferometry of ascending and descending orbit ASAR data, the authors obtained the Double-LOS
coseismic deformation fields of Gaize earthquake in Tibet. A characteristic analysis of coseismic deformation field indicates
that the Ms 6.9 mainshock and Ms 6.0 aftershock both showed the typical model of normal fault and successively gave birth to east
and west normal faulted fracture zones with different sizes probably at depth, trending NE and dipping NW, with the formation of
east and west subsiding centers on the northwest plate. From the incising of interferometric stripes, it can be judged that the
east and west subsiding centers are controlled respectively by January 9, 2008 Ms 6.9 mainshock and January 16, 2008 Ms 6.0
aftershock. The Ms 6.9 mainshock shaped the basic pattern of subsiding in the northwest plate and uplifting in the southeast
plate. And the Ms 6.0 aftershock caused the further subsidence of the epicenter and the western part of the northwest plate;
therefore, the subsidence value of the west subsiding center is larger than that of the east subsiding center. The obtaining of
coseismic deformation fields of ascending-descending orbits has provided the better restriction and information for further
hypocenter mechanism simulation and 3-D deformation field calculation.
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Keywords
Aerial remote sensing
Type of dune
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Issue Date: 22 March 2010
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