HR: 0800h
AN: T41A-01 [Abstracts]
TI: Crustal Structure Across the Three Gorges Dam from Wide-angle Seismic Data
AU: * Zhang, Z
EM: zjzhang1@yahoo.com
AF: Chinese Academy of Sciences, State Key Laboratory of Lithospheric Evolution, Institute of
Geology and Geophysics, Beijing, 100029, China
AU: Bai, Z
EM: a37171@hotmail.com
AF: Chinese Academy of Sciences, State Key Laboratory of Lithospheric Evolution, Institute of
Geology and Geophysics, Beijing, 100029, China
AU: Mooney, W
EM: mooney@usgs.gov
AF: U.S. Geological Survey, 345 Middlefield Rd.
MS 977, Menlo Park, CA 94025, United States
AU: Wang, C
EM: a37171@hotmail.com
AF: China Earthquake Administration, Institute of Geophsyics, Beijing, 100080, China
AU: Chen, X
EM: a37171@hotmail.com
AF: China Earthquake Administration, Institute of Dynamic Deformation, Beijing, 100081, China
AU: Wang, E
EM: a37171@hotmail.com
AF: Chinese Academy of Sciences, State Key Laboratory of Lithospheric Evolution, Institute of
Geology and Geophysics, Beijing, 100029, China
AU: Teng, J
EM: a37171@hotmail.com
AF: Chinese Academy of Sciences, State Key Laboratory of Lithospheric Evolution, Institute of
Geology and Geophysics, Beijing, 100029, China
AB:
The Three Gorges Dam (TGD) is one of the biggest engineering projects in the world. A wide-angle seismic
profile from Fengjie, Sichuan Province, to Guanyindang, Hubei Province, was acquired in order to understand the
crustal structure across TGD. The crustal velocity and reflectivity cross-section across TGD shows lateral velocity
variation and northward-slipping, crustal scale, strong reflection. TGD is located at the crustal thickness transition
belt from about 45 km in the northwest to about 35 km in the southeast. The crustal thickening and steep
topography gradients across TGD are resultant from agents of the channel flow in the middle and lower crust,
indented by the strong foreland of the Jianghan basin. Due to the fault, which is similar to Longmenshan in
eastern Tibet, the earthquake occurrence in the TGD area is low.
DE: 8125 Evolution of the Earth (0325)
DE: 8147 Planetary interiors (5430, 5724, 6024)
DE: 8160 Rheology: general (1236, 8032)
DE: 8178 Tectonics and magmatism
SC: Tectonophysics [T]
MN: 2007 Joint Assembly