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[1]GUO Yingxia,ZHANG Yuansheng,LIU Xuzhou,et al.Application of Ambient Noise Tomography to Study the S-wave Crustal Velocity Structure in Qilian Mountains Region[J].Journal of Seismological Research,2017,40(03):482-490.

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Application of Ambient Noise Tomography to Study the S-wave Crustal Velocity Structure in Qilian Mountains Region

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 40 Number of periods: 2017 03 Page number: 482-490 Column: 自投稿专栏 Public date: 2017-07-20

Title:: Application of Ambient Noise Tomography to Study the S-wave Crustal Velocity Structure in Qilian Mountains Region

Author(s):: GUO Yingxia¹; ZHANG Yuansheng¹; LIU Xuzhou¹; YAN Wenhua²; (1.Lanzhou Institute of Seismology,CEA,Lanzhou 730000,Gansu,China)(2.Shaanxi Earthquake Agency,Xi'an 710068,Shaanxi,China)

Keywords:: ambient noise; cross correlation function; ray tracing; rayleigh wave tomography; the Qilian Mountains region

CLC:: P315.3

DOI:: -

Abstract:: Using the vertical component of continuous background noise records of 38 stations located in the Qilian Mountains(36°N ～ 42°N,96°E ～ 104°E),and the record time was from August 2014 to December 2015,then we obtained the cross correlation function of all seismic station pairs and the velocity dispersion curve of Rayleigh wave.The velocity distribution of the S wave in the depth range of 5 ～ 40 km and is obtained by using the direct inversion method of surface wave dispersion based on ray tracing.The result shows that there is a certain correlation between the velocity structure distribution and the tectonic distribution at the depth of 5 km.And the thickness of the sedimentary layer has obvious effect.The S-wave velocity has an obvious lateral heterogeneity and shows different scales of the regional at the depth of 18 km.Meanwhile,the velocity increases with the depth,and the variation range is 0.2 km/s at the depth of 5～20 km.And the high and low speed phases of Qilian and Menyuan areas are obviously distributed at a depth of 30km.The north of the Qilian Mountains,the Tuolaishan fault,the Lenglongling fault zone,the north of the Lenglongling fault zone,and the south of the Lenglongling fault zone,which may be a manifestation of different blocks at the deep boundary in the depth of 35～40 km.

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Last Update: 2017-07-20