考虑区域构造特征的地壳形变分析拟合推估模型  

Collocation Model Based on Regional Tectonic Features in Crustal Deformation Analysis

作　　者：赵丽华[1] 杨元喜[2] 王庆良[3] 

机构地区：[1]长安大学地质工程与测绘学院,陕西西安710054 [2]西安测绘研究所,陕西西安710054 [3]中国地震局第二监测中心,陕西西安710054

出　　处：《测绘学报》2011年第4期435-441,共7页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(40774001;40841021;40902081);国家863计划(2007AA12Z331)

摘　　要：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。Collocation method,when applied to crustal deformation analysis,can estimate the deformation trend reliably not only of the observed points but also of the unobserved points.But if there are faults or hidden faults in the researched area,accustomed collocation is not proper to deformation analysis because of the discontinuous deformation.So collocation based on regional tectonic deformation background is proposed,which divides the area roughly according to geology information and then establishes collocation models respectively in each division.The points near by the boundary are differentiated by confidence interval of deformation parameter.Since the local deformation or abnormal observations may influence the reliability of modeling,robust estimation with high breakdown point is applied to calculate model parameter which is not disturbed by abnormal points.Simulated and practical examples are given and the results prove the efficiency of the proposed method.

关 键 词：拟合推估 地壳形变分析 区域构造特征 高崩溃污染率 抗差估计 

分 类 号：P227[天文地球—大地测量学与测量工程]