Establishment of Crustal Motion Velocity Field of Chuandian by Numerical Manifold Method and GPS Observations
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摘要: 利用国家重大科学工程中国地壳运动观测网络的两期GPS观测值得到川滇区域内测站的速度。以这些速度为约束,基于数值流形模型拟合了川滇地区的速度场。它很好地结合了块体内部的连续变形和块体间的非连续变形。较非连续变形分析模型,地质构造速度模型和配置拟合模型等更真实模拟了地壳运动速度场,为相关地学研究提供了很好的基础。Abstract: With GPS, VLBI, SLR and other techniques Crustal Movement Observation Network of China (CMONOC) provides a large scale network of crustal observation of high accuracy and spatial and temporal resolution. It is mainly for earthquake predication so most of the GPS observation stations are deployed along faults. In some areas the amount and distribution of GPS observation stations are not as desired. Hardy function interpolation, bi-cubic interpolation function have been used to intensify the GPS network, but the results are not so good. Finite element method and discontinuous deformation analysis are also introduced to simulate the velocity fields. Both the finite element method for continua and the discontinuous deformation analysis for block systems are special cases of numerical manifold method, which is a newly developed general numerical method based upon mathematical manifold. In numerical manifold method the cover displacement functions on individual cover are connected together to form a global displacement on the domain. In this paper Chuandian's crustal motion velocity field is simulated by numerical manifold method with GPS observations. The derived velocity field can well represent the continua and discontinuous zones of Chuandian.
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Keywords:
- crustal motion velocity field /
- numerical simulation /
- GPS
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