The low-velocity layer at the depth of 620 km beneath Northeast China |
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Authors: | XuZhang Shen and HuiLan Zhou |
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Institution: | 1 Laboratory of Computational Geodynamics, Graduate University of the Chinese Academy of Sciences, Beijing 100049, China;
2 Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China |
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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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Keywords: | receiver function common convert points phase weighted stacks low-velocity layer at 620 km depth western Pacific subduction |
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