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[1]张贵钢,杨志强,王庆良,等.基于最小二乘配置模型探讨青藏高原巴彦喀拉块体的运动特征[J].地球科学与环境学报,2011,33(02):213-216.
　ZHANG Gui-gang,YANG Zhi-qiang,WANG Qing-liang,et al.Study on Movement Characteristic of Bayanhar Block in the Qinghai-Tibet Plateau Based on Least Squares Collocation Model[J].Journal of Earth Sciences and Environment,2011,33(02):213-216.
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基于最小二乘配置模型探讨青藏高原巴彦喀拉块体的运动特征(PDF)
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第33卷
期数:
2011年第02期
页码:
213-216
栏目:
地球信息科学
出版日期:
2011-06-15

文章信息/Info

Title:
Study on Movement Characteristic of Bayanhar Block in the Qinghai-Tibet Plateau Based on Least Squares Collocation Model
文章编号:
1672-6561(2011)02-0213-04
作者:
张贵钢1; 杨志强1; 王庆良2; 刘同文1
1.长安大学 地质工程与测绘学院,陕西 西安 710054; 2.中国地震局 第二监测中心,陕西 西安 710054
Author(s):
ZHANG Gui-gang1; YANG Zhi-qiang1; WANG Qing-liang2; LIU Tong-wen1
1. School of Geological Engineering and Surveying, Chang'an University, Xi' an 710054, Shaanxi, China; 2. The Second Crust Monitoring and Application Center, China Earthquake Administration, Xi'an 710054, Shaanxi, China
关键词:
最小二乘配置模型; 板块运动; 巴彦喀拉块体; 龙门山断裂带; 欧拉矢量; 应变场; 青藏高原
Keywords:
least squares collocation model;  block movement;  Bayanhar Block;  Longmenshan fault zone;  Euler vector;  strain field;  the Qinghai-Tibet Plateau
分类号:
P541;P227
DOI:
-
文献标志码:
A
摘要:
论述了块体刚性运动和最小二乘配置模型的原理及构建方法,并对青藏高原中部巴彦喀拉块体的运动趋势及内部形变进行了深入研究。基于最小二乘配置模型,通过建立推估点与观测点间的协方差矩阵,能够较好地区分块体整体刚性旋转及内部的弹性形变,削弱了点位分布对形变场构建产生的影响,从而准确描述区域地壳运动的趋势及应变场特征。结果表明:巴彦喀拉块体的地壳形变受到印度板块的俯冲挤压和青藏高原物质东移的双重作用,在欧亚框架下块体旋转的欧拉矢量为((0.45°±0.14°)/Ma,(-17.5°±5.93°)N,(-77.91°±12.9°)E);巴彦喀拉块体东部北向速率逐渐减小,东向速率逐渐加大。通过对巴彦喀拉块体应变率及面膨胀率的特征分析,发现龙门山断裂带前地壳挤压特征并不明显,说明其逆冲特性并非通过上地壳的缩短实现,应该受到下地壳低速体的作用。
Abstract:
The principle and structure method of block rigid movement and least squares collocation model were introduced, and the movement tendency and interior deformation of Bayanhar Block in the Qinghai-Tibet Plateau were discussed. Based on least squares collocation model, covariance matrixes between collocation points and measurement points were established to discriminate the rigid rotation and elastic deformation of the block, and weaken the influence of point distribution on constructing deformation field, so that the movement trend of regional crust and characteristic of strain field were accurately described. The results indicated that the crustal deformation of Bayanhar Block was influenced by subduction of Indian Plate and eastward movement of the Qinghai-Tibet Plateau, the Euler vector of block rotation was((0.45°±0.14°)/Ma,(-17.5°±5.93°)N),(-77.91°±12.9°)E); velocity gradually decreased northward and increased eastward in the eastern of Bayanhar Block. According to the discussion on the characteristics of strain rate and superficial expansivity of Bayanhar Block, the crustal extrusion was not obvious in front of Longmenshan fault zone, so that the thrust characteristics were not accomplished by the supracrustal shortening, but influenced by lower crustal low-speed body.

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备注/Memo

备注/Memo:
收稿日期:2011-01-11
基金项目: 国家自然科学基金项目(40974062); 中国地震局地震行业科研重点专项项目(200908029); 教育部博士点基金项目(20060710003)
作者简介: 张贵钢(1982-),男,山东青州人,工学博士研究生,从事地壳形变监测与动力学分析研究。E-mail: zhanggang1204@126.com

更新日期/Last Update: 2011-06-20