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考虑区域构造特征的地壳形变分析拟合推估模型
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Journal Article
考虑区域构造特征的地壳形变分析拟合推估模型
2011
Overview
将拟合推估方法应用于地壳形变分析不仅能获得变形趋势的最优估计,而且能较可靠地推估非观测点上的形变。针对研究区域若存在小断层或隐伏断层,则拟合推估法不能给出合理结果的情况,提出建立基于区域构造特征的形变分析拟合推估模型,即通过地质资料对可能存在断层的区域进行概略划分,对分布在断层附近的点建立各区域形变参数置信区间,通过检验判断相应点的归属;然后在差异运动边界已确定的各个区域分别建立拟合推估模型,计算区域形变场。针对区域内可能存在的明显的局部变形或观测异常的测站,提出用高崩溃污染率抗差估计法进行控制,以确保所建立形变分析模型能可靠描述研究区域的形变趋势。最后分别以模拟算例和实测算例验证该方法的有效性。
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