DEEP GEOPHYSICAL EXPLORATION OF LONGMENSHAN AND ITS ADJACENT AREA
Xu Zhaofan 1) ; Pan Jishun 2) ;Wang Fuyun 1) ;Tian Xiaofeng 1) ; and Feng Jianlin 1)
1)Geophysical Exploration Center, CEA, Zhengzhou 4500022)North China University of Water Conservancy and Electric Power, Zhengzhou 450011
Abstract In order to reveal the deep tectonic background of Wenchuan Ms8.0 earthquake, the deep geophysical investigation data were collected and deep structural characteristics beneath Longmenshan area were discussed. The present results show that the Longmenshan tectonic zone is a steep variation belt of crustal thickness.At its two sides, the layers with low velocity or high conductivity are widely distributed, and there is big difference in structures of crust and uppermost mantle. It means that the Longmenshan tectonic zone has a high resistance basement. In western Sichuan Plateau, the Pn velocity is 7.6~7.8 km/s,which is lower than that of Sichuan Basin, where the Pn velocity is 8.0~8.2 km/s.The lower Pn velocity suggests that there is possiblly strong heat exchange between crust and mantle in western Sichuan Plateau. The low velocity-high conductivity layers in middleupper crust are likely to be an L detachment, which served as the deep tectonic conditions for shallow earthquake development in Longmenshan tectonic belt.
Key words ：
Longmenshan tectonic belt
Wenchuan earthquake
geophysical probe
deep structure
low velocity-high conductivity layer
Received: 01 January 1900
Corresponding Authors:
Xu Zhaofan
Cite this article:
Xu Zhaofan ,Pan Jishun ,Wang Fuyun et al. DEEP GEOPHYSICAL EXPLORATION OF LONGMENSHAN AND ITS ADJACENT AREA[J]. , 2008, 28(6): 31-37.
Xu Zhaofan ,Pan Jishun ,Wang Fuyun et al. DEEP GEOPHYSICAL EXPLORATION OF LONGMENSHAN AND ITS ADJACENT AREA[J]. jgg, 2008, 28(6): 31-37.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2008/V28/I6/31
[1]
LIU Zhijun,TAN Kai,WANG Qi,WANG Lei,ZHANG Jian,ZHAO Bin,QIAO Xuejun. Numerical Simulation Analysis of After-Slip and Viscoelastic Relaxation after the Wenchuan Earthquake
[2]
ZHAO Zhichuang，ZHANG Yan，ZHAO Ying. Recognition Analysis on Anomalous Characteristics of Imminent Earthquake——Taking Wenchuan Earthquake as an Example
[3]
WANG Lei, TAN Kai. Study on the Reliability of Coulomb Stress Change Induced by the 2008 Wenchuan MW 7.9 Earthquake
[4]
NIU Anfu,ZHANG Lingkong,ZHANG Jing,LI Yuan,ZHAO Jing,YAN Wei,YUE Chong,YUAN Zhengyi. On the Fixed Points in Crust Deformation prior to Wenchuan Earthquake and Dynamic Background
[5]
JIN Zhitong，WAN Yongge，WANG Fuchang，YANG Fan，LI Yao. Evidence on the Stress Effect of the 2008 Wenchuan Earthquake Rupture to the Northeast
[6]
DONG Peiyu，LIU Chang，SHI Yaolin. Relationship between the 2008 MS 8.0 Wenchuan Earthquake and the 2017 MS 7.0 Jiuzhaigou Earthquake
[7]
XU Kangsheng,LI Ying. The Permutation Entropy Change of Ground Motion before the MS 8.0 Wenchuan Earthquake
[8]
HE Kefeng,ZHAO Bin,DU Ruilin. Post-Seismic Deformation Associated with the 2008 Wenchuan Earthquake by Long-Term GPS Data
[9]
LIU Jie. Coseismic Slip of Wenchuan Earthquake Inversed by Particle Swarm Optimization Algorithm Using Three-Dimensional Data
[10]
WEN Yangmao, ZHANG Guobo, XU Caijun. GPS Velocity Field Clustering in the Sichuan-Yunnan Region
[11]
YUE Chong,YAN Wei,LI Xiaofan,NIU Anfu,ZHAO Jing,YUAN Zhengyi. Sichuan Fault Activity Analysis and Correlation Study of Wenchuan & Lushan Seismic Activity
[12]
.
[13]
SONG Jian,YANG Shaomin,WANG Wei,HUANG Yong,LIN Mu. Study on the Locking Characteristics of Anninghe-Zemuhe-Xiaojiang Fault Zone
[14]
LI Yan’e,WANG Linying,SONG Meiqing,CHEN Lijuan. Study of the Seismogenic Process from Wenchuan to the Lushan Earthquake Based on Wave Velocity Ratio Temporal Variation
[15]
DENG Mingli,SUN Heping,XU Jianqiao. Inversion of the Slip Model of Wenchuan Earthquake and the
Geodetic Constraints of the Regional Structure
