|Table of Contents|

Study on Movement Characteristic of Bayanhar Block in the Qinghai-Tibet Plateau Based on Least Squares Collocation Model(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2011年第02期
Page:
213-216
Research Field:
地球信息科学
Publishing date:

Info

Title:
Study on Movement Characteristic of Bayanhar Block in the Qinghai-Tibet Plateau Based on Least Squares Collocation Model
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
Keywords:
least squares collocation model;  block movement;  Bayanhar Block;  Longmenshan fault zone;  Euler vector;  strain field;  the Qinghai-Tibet Plateau
PACS:
P541;P227
DOI:
-
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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Last Update: 2011-06-20