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Volume 22 Issue 2
Apr 2011
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Zhihui Zou, Huawei Zhou, Wulin Lioa. Crustal and Upper-Mantle Seismic Reflectors beneath the Three Gorges Reservoir Region. Journal of Earth Science, 2011, 22(2): 205-213. doi: 10.1007/s12583-011-0173-x
Citation: Zhihui Zou, Huawei Zhou, Wulin Lioa. Crustal and Upper-Mantle Seismic Reflectors beneath the Three Gorges Reservoir Region. Journal of Earth Science, 2011, 22(2): 205-213. doi: 10.1007/s12583-011-0173-x

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

doi: 10.1007/s12583-011-0173-x
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  • Corresponding author: Zhihui ZOU, zhihuizou@gmail.com
  • Received Date: 21 Sep 2010
  • Accepted Date: 12 Nov 2010
  • Publish Date: 01 Apr 2011
  • 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 increase the station coverage, we made three deployments of a mobile seismologic array in the TGR region 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 constrained 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 reflector in the upper mantle in the TGR region may be by-products of the Qinling (秦岭)-Dabie (大别) orogen.

     

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