| 汶川地震前十年间龙门山区域顾及断层闭锁的地壳应变场 |
| |
| 引用本文： | 肖卓辉,许才军,江国焰,温扬茂.汶川地震前十年间龙门山区域顾及断层闭锁的地壳应变场[J].地球物理学报,2017,60(3):953-961. |
| |
| 作者姓名： | 肖卓辉 许才军 江国焰 温扬茂 |
| |
| 作者单位： | 1. 武汉大学测绘学院, 武汉 430079;
2. 武汉大学地球空间环境与大地测量教育部重点实验室, 武汉 430079;
3. 地球空间信息技术协同创新中心, 武汉 430079 |
| |
| 基金项目： | 国家重点基础研究发展计划（973计划）项目（2013CB733303，2013CB733304），国家自然科学基金项目（41431069，41204043）资助. |
| |
| 摘 要： | 本文利用1997—2008年5月的汶川M_w7.9地震前川滇地区GPS水平速度场数据,采用负位错理论反演了汶川M_w7.9地震前龙门山断裂带的闭锁程度.在顾及断层闭锁影响下,获得了龙门山断裂带区域震前十年间地壳应变率场.结果表明在汶川地震前龙门山断裂带高度闭锁,在地表以下0~25 km范围内其平均闭锁程度为0.972±0.222,滑动亏损速率约为3 mm·a~(-1).震前龙门山断裂滑脱层的高度闭锁为汶川地震深部同震破裂提供了能量基础;在顾及断层闭锁影响下,龙门山断裂带附近应变积累缓慢,断层附近区域最大主应变率约为3.4~9.6 nanostrain·a~(-1),最小主应变率约为-2.5~-7.1 nanostrain·a~(-1);断层西北侧有明显的应变积累.
|
| 关 键 词： | GPS 断层闭锁 应变率 龙门山断裂带 负位错理论 |
| 收稿时间： | 2016-04-03 |
Crustal strain in the Longmenshan region considering fault locking during ten years before the 2008 Wenchuan earthquake |
| |
| XIAO Zhuo-Hui,XU Cai-Jun,JIANG Guo-Yan,WEN Yang-Mao.Crustal strain in the Longmenshan region considering fault locking during ten years before the 2008 Wenchuan earthquake[J].Chinese Journal of Geophysics,2017,60(3):953-961. |
| |
| Authors: | XIAO Zhuo-Hui XU Cai-Jun JIANG Guo-Yan WEN Yang-Mao |
| |
| Institution: | 1. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;
2. Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China;
3. Collaborative Innovation Center of Geospatial Technology, Wuhan 430079, China |
| |
| Abstract: | In this study, the locking degree of the Longmenshan fault and the strain rates in the Longmenshan region before the 2008 Wenchuan earthquake are inverted from the GPS horizontal velocity field between 1997 and May, 2008 using the negative dislocation theory. The inversion results show that the Longmenshan fault was nearly completely locked before the Wenchuan MW7.9 earthquake. The mean coupling degree of the Longmenshan fault from the surface to 25 km depth is 0.972±0.222,and the slip deficit is about 3 mm·a-1. The detachment of Longmenshan that was nearly fully locked provided the energy for the Wenchuan earthquake rupture at depth. With consideration of the fault coupling, crustal strain slowly accumulated near the fault, more obviously at the northwest of the fault. The principal tensile strain rates near the fault range from 3.4 to 9.6 nanostrain·a-1 and the principal compressive strain rates range from -2.5 to -7.1 nanostrain·a-1, respectively. |
| |
| Keywords: | GPS Fault locking Strain rate Longmenshan fault Negative dislocation theory |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地球物理学报》浏览原始摘要信息 |
| 点击此处可从《地球物理学报》下载免费的PDF全文 |
|
