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  2019,Vol.14no.1 ,page:77-86

Preliminary Analysis of the Sichuan-Yunnan Block and Surrounding Fault Movement Using GNSS Continuous Observation Data
Abstract:      In this study, the GNSS continuous station data were analyzed to study the characteristics of the velocity field and strain field of the Sichuan-Yunnan block and the Bayan Har block in 2016-2017, in consideration of that the stress accumulation is relatively concentrated near Dawu, Xichang and Barkam. By analyzing the relative speed of GNSS continuous stations, we found that GNSS continuous station motion in both the Sichuan-Yunnan block and the Bayan Har blocks shows clockwise rotation. By using block relative motion to solve the speed of Xianshuihe fault, we found that the speed of the west of the Xianshuihe fault is slightly faster than that of the east, about 2 to 3 mm/a difference. The movement rate of the Xianshuihe fault in 2017 is smaller than that of 2016, that helps to alleviate the accumulation of strain energy in the Xianshuihe fault. The greater the fault slip difference between the model simulation and the actual measurement, the greater the energy that can be accumulated at the fault. As a result, the seismic energy concentration in the fracture energy concentration area is relatively greater.
Author NameAffiliation
Zhou Haitao The First Monitoring and Application Center, China Earthquake Administration, Tianjin 300180, China 
Zhao Jingyang The First Monitoring and Application Center, China Earthquake Administration, Tianjin 300180, China 
Keywords:    GNSS continuous station  Motion rate  Strain  Xianshuihe fault
Received on:  June 11, 2018
利用GNSS连续观测资料分析川滇地块与断层活动的方法与尝试
摘要:    本文利用GNSS连续站的资料分析2016、2017年川滇块体和巴彦喀拉块体速度场、应变场特征,认为道孚、西昌和马尔康附近应力积累相对集中。分析GNSS连续站点的相对速度发现,川滇块体内GNSS连续站的运动状态呈明显的顺时针旋转,巴彦喀拉块体也有顺时针旋转态势。此外,利用块体相对运动求解鲜水河断裂运动速率,鲜水河断裂西部的运动速率比东部稍大,约有2—3mm/a的差异。相比2016年,2017年鲜水河断裂运动速率变小,有利于缓解鲜水河断裂应变能的积累。
关  键  词:GNSS连续站  运动速率  应变  鲜水河断裂
基金项目:科技基础性工作专项(2015FY210400)
作者简介:周海涛,男,生于1978年。高级工程师。主要从事地震活动性和地震构造等研究工作。E-mail:zh_haitao2@163.com
引用本文格式:周海涛,赵静暘.利用GNSS连续观测资料分析川滇地块与断层活动的方法与尝试[J].震灾防御技术英文版,2019,14(1):77-86  DOI:10.11899/zzfy20190108
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