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Zhu Yiqing
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Zhu Yiqing Second Monitoring Center, China Earthquake Administration, Xi'an 710054, China 
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基金项目:Joint Earthquake ScienceFoundation(105051)%Technologies Programs of China Earthquake Administration(100501-05-05)
Modeling the Dynamic Gravity Variations of Northeastern Margin of Qinghai-Xizang (Tibet) Plateau by Using Bicubic Spline Interpolation Function
Zhu Yiqing
Abstract:
In this paper, the spatial-temporal gravity variation patterns of the northeastern margin of Qinghai-Xizang (Tibet) Plateau in 1992~2001 are modeled using bicubic spline interpolation functions and the relations of gravity change with seismicity and tectonic movement are discussed preliminarily. The results show as follows: ① Regional gravitational field changes regularly and the gravity abnormity zone or gravity concentration zone appears in the earthquake preparation process; ② In the significant time period, the gravity variation shows different features in the northwest, southeast and northeast parts of the surveyed region respectively, with Lanzhou as its boundary; ③ The gravity variation distribution is basically identical to the strike of tectonic fault zone of the region, and the contour of gravity variation is closely related to the fault distribution.
Key words:  Northeastern margin of Qinghai-Xizang (Tibet) Plateau  Gravity variation  Bicubic spline interpolation function  Tectonic deformation