TY - JOUR
T1 - Joint Inversion for Lithospheric Structures
T2 - Implications for the Growth and Deformation in Northeastern Tibetan Plateau
AU - Deng, Yangfan
AU - Li, Jiangtao
AU - Song, Xiaodong
AU - Zhu, Lupei
N1 - Funding Information:
The waveform data for the southern part were acquired by Xiaobo Tian, Tao Xu, Zhiming Bai, Changqing Sun, and Fei Li in the late Professor Zhongjie Zhang's group at Institute of Geology and Geophysics, Chinese Academy of Sciences (IGGCAS) and the waveform data for the northern part were obtained from China Earthquake Administration (CEA) and Incorporated Research Institutions for Seismology (IRIS). The receive function data are available upon request from the corresponding author. We appreciate the comments from two anonymous reviewers, which improved the manuscript. The authors benefited from discussions with An Yin and Greg Houseman. The data used (dispersion, RF, and Vp) and the models obtained (Vs, Vp/Vs, and Moho depth) in this study are available at https://www.researchgate.net/publication/324224188_The_data_for_GRL_paper. The research was supported by the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (XDB18000000), the National Nature Science Foundation of China (41504069 and 41774056), the China National Special Fund for Earthquake Scientific Research in Public Interest (201508020), and the U.S. National Science Foundation (EAR 1620595).
Funding Information:
The waveform data for the southern part were acquired by Xiaobo Tian, Tao Xu, Zhiming Bai, Changqing Sun, and Fei Li in the late Professor Zhongjie Zhang’s group at Institute of Geology and Geophysics, Chinese Academy of Sciences (IGGCAS) and the waveform data for the northern part were obtained from China Earthquake Administration (CEA) and Incorporated Research Institutions for Seismology (IRIS). The receive function data are available upon request from the corre sponding author. We appreciate the comments from two anonymous reviewers, which improved the manu script. The authors benefited from dis cussions with An Yin and Greg Houseman. The data used (dispersion, RF, and Vp) and the models obtained (Vs, Vp/Vs, and Moho depth) in this study are available at https://www. researchgate.net/publication/ 324224188_The_data_for_GRL_paper. The research was supported by the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (XDB18000000), the National Nature Science Foundation of China (41504069 and 41774056), the China National Special Fund for Earthquake Scientific Research in Public Interest (201508020), and the U.S. National Science Foundation (EAR 1620595).
Publisher Copyright:
©2018. American Geophysical Union. All Rights Reserved.
PY - 2018/5/16
Y1 - 2018/5/16
N2 - Several geodynamic models have been proposed for the deformation mechanism of Tibetan Plateau (TP), but it remains controversial. Here we applied a method of joint inversion of receiver functions and surface wave dispersions with P wave velocity constraint to a dense linear array in the NE Tibet. The results show that the geological blocks, separated by major faults at the surface, are characterized by distinct features in the crust, the Moho, and the uppermost mantle. The main features include crustal low-velocity zones (LVZs) with variable strengths, anomalous Vp/Vs ratios that are correlated with LVZs, a large Moho jump, and other abrupt changes near major faults, strong mantle lithosphere anomalies, and correlation of crustal and mantle velocities. The results suggest a lithospheric-scale deformation of continuous shortening as well as localized faulting, which is affected by the strength of the lithosphere blocks. The thickened mantle lithosphere can be removed, which facilitates the formation of middle-lower crustal LVZ and flow. However, such flow is likely a consequence of the deformation rather than a driving force for the outward growth of the TP. The proposed model of TP deformation and growth can reconcile the continuous deformation within the blocks and major faults at the surface.
AB - Several geodynamic models have been proposed for the deformation mechanism of Tibetan Plateau (TP), but it remains controversial. Here we applied a method of joint inversion of receiver functions and surface wave dispersions with P wave velocity constraint to a dense linear array in the NE Tibet. The results show that the geological blocks, separated by major faults at the surface, are characterized by distinct features in the crust, the Moho, and the uppermost mantle. The main features include crustal low-velocity zones (LVZs) with variable strengths, anomalous Vp/Vs ratios that are correlated with LVZs, a large Moho jump, and other abrupt changes near major faults, strong mantle lithosphere anomalies, and correlation of crustal and mantle velocities. The results suggest a lithospheric-scale deformation of continuous shortening as well as localized faulting, which is affected by the strength of the lithosphere blocks. The thickened mantle lithosphere can be removed, which facilitates the formation of middle-lower crustal LVZ and flow. However, such flow is likely a consequence of the deformation rather than a driving force for the outward growth of the TP. The proposed model of TP deformation and growth can reconcile the continuous deformation within the blocks and major faults at the surface.
KW - Tibetan Plateau
KW - crustal flow
KW - deformation and growth
KW - delamination
KW - joint inversion
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U2 - 10.1029/2018GL077486
DO - 10.1029/2018GL077486
M3 - Article
AN - SCOPUS:85046543253
SN - 0094-8276
VL - 45
SP - 3951
EP - 3958
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 9
ER -