﻿ 红河断裂带闭锁程度与滑动亏损分布的GNSS反演
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 大地测量与地球动力学  2021, Vol. 41 Issue (3): 296-300  DOI: 10.14075/j.jgg.2021.03.014

### 引用本文

ZHU Xulin, XU Keke, HOU Zheng, et al. GNSS Inversion of Fault Locking and Fault Slip Deficit of the Red River Fault Zone[J]. Journal of Geodesy and Geodynamics, 2021, 41(3): 296-300.

### Foundation support

National Natural Science Foundation of China, No. 41774041.

### 第一作者简介

ZHU Xulin, postgraduate, majors in geodesy and fault zone, E-mail: zhuxvlin@126.com.

### 文章历史

1. 河南理工大学测绘与国土信息工程学院，河南省焦作市世纪大道2001号，454000

1 研究方法

 ${V_{{\rm{sf}}}} = {V_{{\rm{br}}}} + {V_{{\rm{is}}}} + {V_{{\rm{fs}}}}$

 $\begin{array}{l} {V_i}\left( X \right) = \sum\limits_{b = 1}^B {H(X \in {\Delta _b})} \left[ {\mathit{\Omega} _b^R \times X} \right]\cdot i - \\ \sum\limits_{k = 1}^F {\sum\limits_{n = 1}^{{N_k}} {\sum\limits_{j = 1}^2 {{\varphi _{nk}}{G_{ij}}(X, {X_{nk}})\left[ {\mathit{\Omega} _f^h \times {X_{nk}}} \right]\cdot j} } } \end{array}$ (1)

 $\left[ \begin{array}{l} {V_\lambda }\\ {V_\theta } \end{array} \right] = \left[ {\begin{array}{*{20}{c}} {R{\rm{sin}}{\theta _0}\Delta \lambda }&{R\Delta \theta }&0\\ 0&{R{\rm{sin}}{\theta _0}\Delta \lambda }&{R\Delta \theta } \end{array}} \right]\left[ {\begin{array}{*{20}{c}} {\dot \varepsilon _\lambda }\\ {\dot \varepsilon _{\lambda \theta} }\\ {\dot \varepsilon _\theta }\\ \end{array}} \right]$ (2)

 $\chi _n^2 = \frac{{\sum\limits_{i = 1}^n {{{\left( {\frac{{{r_i}}}{{{f_{{\sigma _i}}}}}} \right)}^2}} }}{{{\rm{dof}}}}$ (3)

2 研究区与GNSS观测

 图 1 研究区速度场 Fig. 1 Velocity field of the study area

 图 2 GPS速度剖面 Fig. 2 GPS velocity profile
3 实验结果

 图 3 龙门山断裂带闭锁程度 Fig. 3 Locking degree of Longmenshan fault zone

 图 4 研究区块体划分 Fig. 4 Blocks in the study area

 图 5 断层节点模型 Fig. 5 Fault node model

 图 6 红河断裂带闭锁程度 Fig. 6 Locking degree of Red River fault zone

 图 7 红河断裂带滑动亏损速率 Fig. 7 Slip deficit velocity of Red River fault zone

4 讨论

5 结语

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GNSS Inversion of Fault Locking and Fault Slip Deficit of the Red River Fault Zone
ZHU Xulin1     XU Keke1     HOU Zheng1     LIU Jipeng1     ZHAO Fuling1     YAO Weizheng1     SHAO Zhenhua1
1. School of Surveying and Land Information Engineering, Henan Polytechnic University, 2001 Shiji Road, Jiaozuo 454000, China
Abstract: In this paper, we use the GPS velocity fields of 1999-2007 and 2009-2013, and the negative dislocation-block model of TDEFNODE to invert fault locking and slip deficit velocity of the Red river fault zone. The results show that the Red river fault zone is dominated by right-lateral strike-slip, with some extension and compression. Before 2008, the average strike-slip rate and dip-slip rate of the Red river fault zone is 3.8±2.5 mm/a and 1.2±2.5 mm/a, the northern and middle segments exhibit tension, and the southern segment exhibits compression. The locking fraction of the northern and middle segments between 0 to 15 km depth are from 0.8 to 0.99, and the slip deficit rate is 4.5 mm/a, for which it is easy to accumulate strain energy quickly. The locking fraction of the southern segment between 0 to 10 km depth is from 0.8 to 0.95, and the slip deficit rate is 4.5 mm/a. After 2008, the fault locking and slip deficit rate in the middle segment decrease, and the fault locking and slip deficit rate in the southern segment increase.
Key words: Red river fault zone; TDEFNODE; fault locking; slip deficit