Abstract
Based on the 3-D Earth model, the common convert points-phase weighted stacks (CCP-PWS) migration method is used to image the upper mantle discontinuities beneath Northeast China (longitude 120°–132°; latitude 38°–40°) with 802 observed receiver functions. Teleseismic records are obtained from 4 stations belonging to CCDSN and 19 stations belonging to PASSCAL. A low-velocity layer has been detected at the depth of 620 km. This low-velocity layer rises to 600 km in the east of the study region close to the subducted slab. We consider that this low-velocity layer might be the accumulated oceanic crustal material delaminated from the western Pacific subducted slab. Additionally, we detect the obvious depression of 660 km discontinuity which was attributed to the interaction between the upper mantle and subducted slab. The maximum depth of 660 km discontinuity approaches 700 km, and 660 km discontinuity splits into multiple discontinuities in the northeast of the study region.
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References
Bina C, Helffrich G. Phase transition Clapyron slopes and transition zone seismic discontinuity topography. J Geophys Res, 1994, 99: 853–860
Wu Q, Li Y, Zhang R, et al. Wavelet modeling of broadband receiver functions. Geophys J Int, 2007, 170: 534–544
Wu Q J, Li Y, Zhang R, et al. Receiver functions from autoregressive deconvolution. Pure Appl Geophys, 2007, 164: 2175–2192
Wu Q J, Zeng R S, Zhao W J. The upper mantle structure of the Tibetan Plateau and its implication for the continent-continent collision. Sci China Ser D-Earth Sci, 2005, 48(8): 1158–1164
Shen Y, Blume J. Seismic evidence for accumulated oceanic crust above the 660-km discontinuity beneath southern Africa. Geophys Res Lett, 2003, 30(18), 1925, doi: 10.1029/2003GL017 991
Irifune T, Ringwood A E. Phase transformation in subducted oceanic crust and buoyancy relationships at depths of 600–800 km in the mantle. Earth Planet Sci Lett, 1993, 117: 101–110
Ringwood A E. The pyroxene-garnet transformation in the Earth’s mantle. Earth Planet Sci Lett, 1967, 2: 255–263
Anderson D L. Chemical stratification of the mantle. J Geophys Res, 1979, 84: 6297–6298
van Keken P E, Karato S, Yuen D A. Rheological control of oceanic crust separation in the transition zone. Geophys Res Lett, 1996, 23: 1821–1824
Karato S. On the separation of crustal component from subducted oceanic lithosphere near the 660 km discontinuity. Phys Earth Planet Int, 1997, 99: 103–111
Gudmundsson O, Sambridge M. A regionalized upper mantle (RUM) seismic model. J Geophys Res, 1998, 103: 7121–7136
Huang J, Zhao D. High-resolution mantle tomography of China and surrounding regions. J Geophys Res, 2006, 111 B09305, doi: 10.1029/2005JB004066
Shen X Z, Zhou H L, Kawakatsu H. Mapping the upper mantle discontinuities beneath China with teleseismic receiver functions. Earth Planet Space, 2008, 60(7): 713–719
Niu F, Kawakatsu H. Complex structure of the mantle discontinuities at the tip of the subducting slab beneath the northeast China: a preliminary investigation of broadband receiver functions. J Phys Eart, 1996, 44: 701–711
Li X, Yuan X. Receiver functions in northeast China — implications for slab penetration into the lower mantle in northwest Pacific subduction zone. Earth Planet Sci Lett, 2003, 216: 679–691
Lebedev S, Sébastien C, van der Hilst R. The 660-km discontinuity within the subducting NW-Pacific lithospheric slab. Earth Planet Sci Lett, 2002, 205: 25–35
Ai Y, Zheng T, Xu W, et al. A complex 660 km discontinuity beneath northest China. Earth Planet Sci Lett, 2003, 212: 63–71
Zhou Y Z, Zang S X. Mantle discontinuities beneath the stations MDJ and HIA and its implications. Chin J Geophys, 2001, 44(6): 748–759
Bassin C, Laske G, Masters G. The current limits of resolution for surface wave tomography in North America, EOS Trans AGU, 2000, 81: F897
Grand P S. Mantle shear-wave tomography and the fate of subducted slabs. Phil Trans R Soc Lond A, 2001, 360: 2475–2491
Ligorria J P, Ammon C J. Iterative deconvolution and receiver-function estimation. Bull Seismol Soc Am, 1999, 89: 1395–1400
Yuan X, Ni J, Kind R, et al. Lithospheric and upper mantle structure of southern Tibet from a seismological passive source experiment. J Geophys Res, 1997, 102(B12): 27491–27500
Kennett B L N, Engdahl E R. Travel times for global earthquake location and phase identification. Geophys J Int, 1991, 105: 429–465
Efron B, Tibshirani R J. An Introduction to the Bootstrap. New York: Chapman and Hall, 1993
Sheriff R E. Nomogram for Fresnel-zone calculation. Geophysics, 1980, 45: 968–972
Schimmel M, Paulssen H. Noise reduction and detection of weak, coherent signals through phase weighted stacks. Geophys J Int, 1997, 130: 497–505
Crotwell H P, Owens T J, Ritsema J. The TauP Toolkit: Flexible seismic travel-time and ray-path utilities. Seismol Res Lett, 1999, 70: 154–160
Cassidy J F. Numerical experiments in broadband receiver function analysis. Bull Seismol Soc Am, 1992, 82: 1453–1474
Inoue T, Weidner D J, Northrup P A, et al. Elastic properties of hydrous ringwoodite (g-phase) in Mg2SiO4. Earth Planet Sci Lett, 1998, 160: 107–113
Dziewonski A M, Anderson D L. Preliminary reference Earth model. Phys Earth Planet Int, 1981, 25: 297–356
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Supported by the National Natural Science Foundation of China (Grant Nos. 40574024 and 40374009)
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Shen, X., Zhou, H. The low-velocity layer at the depth of 620 km beneath Northeast China. Chin. Sci. Bull. 54, 3067–3075 (2009). https://doi.org/10.1007/s11434-008-0559-z
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DOI: https://doi.org/10.1007/s11434-008-0559-z