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[1]王 岩,洪 敏,邵德胜,等.基于GPS资料研究云南地区地壳形变动态特征*[J].地震研究,2018,41(03):368-374.
 WANG Yan,HONG Min,SHAO Desheng,et al.Study on Dynamic Characteristics of Crustal Deformation in Yunnan Area using GPS[J].Journal of Seismological Research,2018,41(03):368-374.
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基于GPS资料研究云南地区地壳形变动态特征*(PDF/HTML)

《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:
41
期数:
2018年03期
页码:
368-374
栏目:
出版日期:
2018-08-20

文章信息/Info

Title:
Study on Dynamic Characteristics of Crustal Deformation in Yunnan Area using GPS
作者:
王 岩洪 敏邵德胜汪志民
(云南省地震局,云南 昆明 650224)
Author(s):
WANG YanHONG MinSHAO DeshengWANG Zhimin
(Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)
关键词:
最小二乘配置 GPS速度场 应变参数 GPS速度剖面
Keywords:
least squares configuration GPS velocity field strain parameter GPS velocity profile
分类号:
P315.725
DOI:
-
摘要:
基于1999—2007年和2011—2013年2期云南地区的GPS速度场资料,结合最小二乘配置方法给出了2个时段应变参数和GPS速度剖面结果,综合分析了汶川8.0级地震前后云南地区地壳变形动态演化特征。GPS 速度场动态演化结果表明:整体上GPS速度场方向从川滇块体南部的南向逐渐转为滇南块体的南东向,块体边界断裂带附近存在明显的相对运动特征。相比于1999—2007年,点位更加密集的2011—2013年GPS速度场结果还反映了断裂带分段变形特征; 在滇南块体及周边地区,南东向的运动有显著的增加。应变参数动态演化结果表明:整体上呈现“中部拉张、两端挤压”的特点; 区域变形(剪切、拉张或挤压)的分布特征与区域主要断裂带的背景运动及变形特征密切相关; 相比于1999—2007年,2011—2013年的拉张变形区有所扩大,并且有向东和向南扩展的趋势; 川滇块体东边界(小江断裂带)整体的挤压变形已经不再显著,主要集中在小江断裂带北段靠北的区域。跨断裂带GPS速度剖面结果显示:小江断裂带左旋滑动速率从北向南逐渐减小(由10 mm/a减至5 mm/a),北段变形宽度较宽; 红河断裂带右旋滑动速率约为4 mm/a,变形宽度较宽; 动态结果表明,汶川地震对2条断裂带变形模式影响较小。
Abstract:
Based on the GPS velocity field data of 1999—2007 and 2011—2013,we used the least squares configuration method and GPS velocity profile results to synthetically analyze the dynamic evolution characteristics of crustal deformation in Yunnan area before and after the Wenchuan earthquake. The dynamic evolution of GPS velocity field shows that the direction is gradually changed from the south of the southern part of the Sichuan-Yunnan block to the south-west of the southern Yunnan block and there is a clear relative motion characteristic near the block boundary fault zone. Compared with the GPS velocity of 1999—2007,the results of 2011—2013 also reflect segmental deformation characteristics of the block boundary fault zone. South-east movement has a significant increase. This may be related to crustal deformation adjustment after the Wenchuan earthquake. The dynamic evolution of strain parameters shows that ‘middle tension,squeeze at both ends' is in the whole area and the distribution of deformation(shear,tension or extrusion)is closely related to the background motion and deformation characteristics of the main fault zone. Compared with results during the period of 1999—2007,the tensile zone in 2011—2013 has been expanded in the eastward and southward direction. The extrusion deformation of the eastern boundary(Xiaojiang fault zone)of the Sichuan-Yunnan block is no longer significant,mainly concentrated in the northern section of the Xiaojiang fault zone,which may be related to the post-seismic deformation adjustment of the Wenchuan earthquake. The GPS velocity profile results show that the left-lateral slip velocity of the Xiaojiang fault zone reduced gradually from north to south(from 10 mm/a to 5 mm/a),and the width of the northern section is wider. The right-hand slip rate of the Honghe fault zone is about 4 mm/a,and the deformation width is wider. The dynamic results show that the Wenchuan earthquake has little effect on the deformation modes of the two fault zones.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2017-08-04
基金项目:李建城院士工作站(2015IC015)资助.
通讯作者:洪敏(1982-),高级工程师,主要从事地壳形变监测与地震预测预报研究.E-mail:hmqr@qq.com

更新日期/Last Update: 2018-07-20