The Crustal Velocity Structure of the Ordos Block and Its Southern Edge Revealed from the Ambient Seismic Noise Extraction
详细信息
- 责任者：Chen Qiangsen (School of Earth Sciences and Engineering ; Nanjing University ; Nanjing 210093 ; China) ; Bao Xuewei
- 刊名：Geological Journal of China Universities
- 出版年：2013
- 卷期：19(3)
- 关键词：地壳结构 ; crustal structure ; 鄂尔多斯地台 ; Ordos Platform
- 页码：p.504-512
- 图表：7 illus., 33 refs.
- 分类号：0400
- issnNo：ISSN1006-7493
- isbnNo：CN32-1440/P
摘要
Using the dispersion curves of Rayleigh waves that were extracted from the seismic noise of 53 broad-band stations recorded in the Ordos Block and its southern Edge by two seismic stations cross correlation,we have obtained the average dispersion curve of the Fen-Wei graben system,the Northern edge of Qinling,the Ordos Block and the Liupan Mountains,and extracted the crustal and upper mantle structures of the four regions.The results show that the depth of the crust in the Fen-Wei graben system,the northern edge of Qinling and the Ordos Block,and the Liupan Mountains is 34 km,~40 km,and 49~50 km,respectively.The velocity of S wave in the uppermost mantle of the corresponding region is 4.20 km/s,4.25 km/s,4.30 km/s,and 4.15 km/s.The most obvious difference of velocity structure appears in the upper crust.The Liupan Mountains has a low velocity in the middle crust.The characteristics of velocity are almost the same for the lower crust.
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