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  Rayleigh wave phase velocity maps of Tibet and the surrounding regions from ambient seismic noise tomography

Yang, Y., Zheng, Y., Chen, J., Zhou, S., Celyan, S., Sandvol, E., Tilmann, F., Priestley, K., Hearn, T. M., Ni, J. F., Broewn, L. D., Ritzwoller, M. H. (2010): Rayleigh wave phase velocity maps of Tibet and the surrounding regions from ambient seismic noise tomography. - Geochemistry Geophysics Geosystems (G3), 11, Q08010.
https://doi.org/10.1029/2010GC003119

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 Creators:
Yang, Y.1, 2, Author
Zheng, Y.1, 2, Author
Chen, Jun2, 3, Author              
Zhou, S.1, 2, Author
Celyan, S.1, 2, Author
Sandvol, E.1, 2, Author
Tilmann, Frederik2, 4, Author              
Priestley, K.1, 2, Author
Hearn, T. M.1, 2, Author
Ni, J. F.1, 2, Author
Broewn, L. D.1, 2, Author
Ritzwoller, M. H.1, 2, Author
Affiliations:
1External Organizations, ou_persistent22              
2GEOFON, Deutsches GeoForschungsZentrum, Potsdam, , ou_2634888              
3Deutsches GeoForschungsZentrum, ou_persistent13              
42.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_30023              

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 DDC: 550 - Earth sciences
 Abstract: Ambient noise tomography is applied to the significant data resources now available across Tibet and surrounding regions to produce Rayleigh wave phase speed maps at periods between 6 and 50 s. Data resources include the permanent Federation of Digital Seismographic Networks, five temporary U.S. Program for Array Seismic Studies of the Continental Lithosphere (PASSCAL) experiments in and around Tibet, and Chinese provincial networks surrounding Tibet from 2003 to 2009, totaling ∼600 stations and ∼150,000 interstation paths. With such a heterogeneous data set, data quality control is of utmost importance. We apply conservative data quality control criteria to accept between ∼5000 and ∼45,000 measurements as a function of period, which produce a lateral resolution between 100 and 200 km across most of the Tibetan Plateau and adjacent regions to the east. Misfits to the accepted measurements among PASSCAL stations and among Chinese stations are similar, with a standard deviation of ∼1.7 s, which indicates that the final dispersion measurements from Chinese and PASSCAL stations are of similar quality. Phase velocities across the Tibetan Plateau are lower, on average, than those in the surrounding nonbasin regions. Phase velocities in northern Tibet are lower than those in southern Tibet, perhaps implying different spatial and temporal variations in the way the high elevations of the plateau are created and maintained. At short periods (<20 s), very low phase velocities are imaged in the major basins, including the Tarim, Qaidam, Junggar, and Sichuan basins, and in the Ordos Block. At intermediate and long periods (>20 s), very high velocities are imaged in the Tarim Basin, the Ordos Block, and the Sichuan Basin. These phase velocity dispersion maps provide information needed to construct a 3-D shear velocity model of the crust across the Tibetan Plateau and surrounding regions.

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Language(s): eng - English
 Dates: 2010
 Publication Status: Finally published
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 Rev. Type: -
 Identifiers: eDoc: 15311
GFZPOF: PT1 Planet Earth: Global Processes and Change
GFZPOF: PT2 Earth System Dynamics: Coupled Processes and Regional Impact
DOI: 10.1029/2010GC003119
 Degree: -

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Title: Geochemistry Geophysics Geosystems (G3)
Source Genre: Journal, SCI, Scopus, oa , OA seit 15. September 2021
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Pages: - Volume / Issue: 11 (Q08010) Sequence Number: - Start / End Page: - Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals159