Abstract
A high-resolution 3-D crustal and upper-mantle shear-wave velocity model of Northeast China is established by joint inversion of receiver functions and fundamental-mode Rayleigh wave phase velocities. The teleseismic data used to calculate receiver functions are collected from 107 CEA permanent sites and 118 NECESSArray portable stations. Rayleigh wave dispersion measurements are extracted from an independent tomographic study. Our model exhibits significant detail in S-wave velocity structure. Particularly, we observe a nearly constant S-wave velocity of 3.4-3.6 km/s from shallow to deep crystalline crust under the study area, which we attribute to a high thermal gradient. Some modestly positive S-wave velocity anomalies in the crust beneath the Songliao basin are interpreted as solidified late-Mesozoic mafic intrusions. In the upper mantle, we confirm the local presence of low velocity zones below the Changbai mountains and Lesser Xing’an mountain range, consistent with asthenospheric mantle upwelling models. Furthermore, moderately low shear velocities imaged beneath the Halaha and Abaga volcanoes indicate possible pathways of magma ascent through the lithospheric mantle from the asthenosphere. At a regional scale, the average lithosphere-asthenosphere boundary depth increases from ∼70 km under the greater Changbai mountains to ∼100 km below the Songliao basin, and reaches ∼110-120 km beneath the Greater Xing’an mountain range in the west. The conjectured dense mantle lid under the Songliao basin, characterized by fast S-velocities, may have prevented sub-lithospheric melts from migrating to the surface
| Original language | English (US) |
|---|---|
| Journal | Journal of Geophysical Research: Solid Earth |
| DOIs | |
| State | Published - Apr 21 2022 |
Bibliographical note
KAUST Repository Item: Exported on 2022-04-26Acknowledged KAUST grant number(s): BAS/1/1339-01-01
Acknowledgements: We are grateful to the NECESSArray Project Team for sharing the waveform data of the portable seismic stations, which were downloaded from Incorporated Research Institutions for Seismology (IRIS).The teleseismic waveform data recorded by the permanent stations were provided by China Seismic DataManagement Center at Institute of Geophysics, China Earthquake Administration, and can be accessed from the data center (http://www.chinarraydmc.cnor http://www.seisdmc.ac.cn).WesincerelythankZhen Guo and colleagues at Southern University of Science and Technology for sharing the fundamental-mode Rayleigh wave phase velocity dispersion data. We also thank Jessica Reid and two anonymous reviewers for their constructive comments that greatly help to improve the manuscript. The research presented in the paper is supported by the National Science Foundation of China(grants41974011, 42174125) and National Key R&D Program of China (MOST grant 2018YFC1503606).J.J. thanks the Conselho Nacional de Desenvolvimento Científico e Tecnológico(CNPq) for his continued research fellowship (CNPq 308644/2019-0). P.M.M. is supported by funding from King Abdullah University of Science and Technology, grant number BAS/1/1339-01-01.W.D.M. acknowledges support from the Earthquake Hazards Program of the U.S. Geological Survey. The 3-D shear-wave velocity model can be accessed at https://doi.org/10.5281/zenodo.6388180.