南北构造带天水、武都强震区地壳和上地幔顶部结构

赖晓玲; 李松林; 宋占龙; 樊计昌; 刘明军; 何加勇

Volume 34 Issue 4

Jul. 2009

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Article Navigation > Earth Science > 2009 > 34(4): 651-657

LAI Xiao-ling, LI Song-lin, SONG Zhan-long, FAN Ji-chang, LIU Ming-jun, HE Jia-yong, 2009. Structure of Crust and Upper Mantle in Tianshui-Wudu Strong Earthquake Region of North-South Tectonic Belt. Earth Science, 34(4): 651-657.

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Structure of Crust and Upper Mantle in Tianshui-Wudu Strong Earthquake Region of North-South Tectonic Belt

1.
Geophysical Exploration Center, China Earthquake A dministration, Zhengz hou 450002, China
2.
Institute of Geophysics, China Earthquake A dministration, Beij ing 100081, China

Received Date: 2008-10-28
Publish Date: 2009-07-25

Abstract

Abstract

The structure of crust and upper mantle in Tianshui-Wudu strong earthquake region is studied by using DSS data from two cross high resolution refraction /wide angle reflection profiles and corresponding fan profiles.The 2-D result shows that the crust can be vertically divided into two layers: upper crust and lower crust.There exists a low velocity layer in the upper crust with velocity difference of 0.3-0.5 km/s.The depth of Moho is about 46-48 km.There is a strong lateral variation in the lower crust along the NE Tianshui-Wudu profile.And along the NW Chengxian-Wushan profile, there are some evidences showing that the Moho and C discontinuities are changed by substances from the deep layer.The 3-D result shows that there is a fault with near NS strike at the depth of 7-11 km near 105°E.The velocities at the two sides of this fault are quite different: low velocity at the west side and high velocity at the east side.This NS fault is very close to the deep fault of 2-D profile.All the large earthquakes occurred near 105°E and formed a NS belt.
- North-South tectonic belt,
- deep seismic sounding,
- strong earthquake region,
- seismic prospecting.

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References(29)

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Structure of Crust and Upper Mantle in Tianshui-Wudu Strong Earthquake Region of North-South Tectonic Belt

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