作者:Xiao, ZH (Xiao Zhuo-Hui)^{[ 1 ]} ; Xu, CJ (Xu Cai-Jun)^{[ 1,2,3 ]} ; Jiang, GY (Jiang Guo-Yan)^{[ 3 ]} ; Wen, YM (Wen Yang-Mao)^{[ 1,2,3 ]}

CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION

卷: 60期: 3页: 953-961

DOI: 10.6038/cjg20170310

出版年: MAR 2017

摘要

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 M(w)7.9 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'. 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.

关键词

作者关键词:GPS; Fault locking; Strain rate; Longmenshan fault; Negative dislocation theory

KeyWords Plus:PRESENT-DAY KINEMATICS; BAYAN HAR BLOCK; M(S)8.0 EARTHQUAKE;TECTONIC IMPLICATION; TIBETAN PLATEAU; ACTIVE BLOCKS; SLIP RATES; GPS DATA;DEFORMATION; ZONE

作者信息

通讯作者地址: Xu, CJ (通讯作者)

通讯作者地址: Xu, CJ (通讯作者)

地址:

电子邮件地址:zhhxiao@whu.edu.cn; cjxu@sgg.whu.edu.cn

出版商

SCIENCE PRESS, 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA

类别/分类

研究方向:Geochemistry & Geophysics

Web of Science类别:Geochemistry & Geophysics

文献信息

文献类型:Article

语种:Chinese

入藏号: WOS:000396386700010

ISSN: 0001-5733

期刊信息

· Impact Factor (影响因子): 0.984