Crustal and Upper-Mantle Seismic Reflectors beneath the Three Gorges Reservoir Region

Seismic studies of the crustal structure beneath the Three Gorges Reservoir（TGR） region in Central China have been limited by the sparse and uneven distribution of seismic stations.To in-crease the station coverage,we made three deployments of a mobile seismologic array in the TGR re-gion during the...

Full description

Saved in:
Bibliographic Details
Published in:Journal of earth science (Wuhan, China) China), 2011-04, Vol.22 (2), p.205-213
Main Author: 邹志辉 周华伟 廖武林
Format: Article
Language:English
Subjects:
Biogeosciences
Byproducts
Canyons
Earth and Environmental Science
Earth science
Earth Sciences
Earthquakes
Geochemistry
Geology
Geotechnical Engineering & Applied Earth Sciences
Reflection
Reflectors
Reservoirs
Seismic activity
Seismic engineering
Seismic phenomena
Seismology
Stations
Tomography
Upper mantle
Waveforms
三峡库区
三峡水库区
上地幔
反射振幅
地壳结构
地震台站
地震波形数据
莫霍面
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Seismic studies of the crustal structure beneath the Three Gorges Reservoir（TGR） region in Central China have been limited by the sparse and uneven distribution of seismic stations.To in-crease the station coverage,we made three deployments of a mobile seismologic array in the TGR re-gion during the three summers from 2008 to 2010.Here we present interpretations along a west-east profile through the central TGR region based on new seismic waveform data and a velocity model con-strained by regional earthquake data.Two strong mid-crustal reflection interfaces at depths around 10 and 20 km are seen under the TGR.The shallow reflector defines the bottom of the Zigui（秭归） basin.The new waveform data show that the amplitude of the Moho reflection is quite weak,and beneath the Moho,there is a strong reflector around 54-km depth.It is likely that in the TGR region,the Moho is a gradient rather than a sharp boundary.We speculate that the gradient Moho and the 54-km-deep re-flector in the upper mantle in the TGR region may be by-products of the Qinling（秦岭）-Dabie（大别） orogen.
ISSN:1674-487X
1867-111X
DOI:10.1007/s12583-011-0173-x