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基于聚类分析的川滇地区块体划分与应变计算
投稿时间:2018-09-04  修订日期:2018-10-29  点此下载全文
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作者单位E-mail
张小青 福建水电学院 1009796046@qq.com 
许才军 武汉大学测绘学院  
中文摘要:本文研究川滇地区块体划分与区域地壳应变。首先,对川滇地区GPS水平速度场采用 K-medoids聚类法直接聚类;然后,基于改进的K-medoids方法,利用GPS站点地理位置与水平速度场对初步聚类结果联合约束进行第二次聚类分析,并结合F统计检验法确定各块体边界;最后,运用整体旋转线性应变模型计算各块体的应变参数,分析了水平运动、应变场空间分布与区域构造变形的关系。研究结果表明:川滇地区的GPS聚类分析结果与地质学提出的板块划分结果相吻合,为块体划分提供另一种方式;整体旋转线性应变模型计算的应变结果显示川滇菱形块体表现为最大剪应变和面应变率梯度高值区,表明该区域积累了一定的弹性应变能,具有发生地震的危险性。
中文关键词:GPS速度场  川滇地区  聚类分析  应变
 
Block Partitioning and Strain Calculation in Sichuan-Yunnan Region Based on the Cluster Analysis
Abstract:In this paper, we focus on the block partitioning and strain calculation in Sichuan-Yunnan region. Firstly, the K-medoids clustering method is used to cluster the GPS horizontal velocity field in Sichuan-Yunnan. We further cluster the initial classification results with the constraints from the the geographical location and velocity field of GPS stations by using the improved K-medoids method. And combined with F statistical test method to determine the boundary of each block; Finally, the strain parameters of each block are calculated using integral rotation linear strain model.And the relationship between horizontal motion, spatial distribution of strain field and regional tectonic deformation is analyzed. Experimental results show that: The results of velocity field clustering analysis of GPS stations in the Sichuan-Yunnan region is consistent with the results of plate division based on geology, which provides another way for block division. The strain results which are calculated by integral rotation linear strain model show that the Sichuan-Yunnan rhombic block is the maximum shear strain and the high value area of the surface strain rate gradient and that this region has accumulated certain elastic strain energy, which is dangerous to earthquake.
keywords:GPS velocity field  the Sichuan-Yunnan region  cluster analysis  strain
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