壳幔三维速度参考模型构建方法研究——以华南陆块中部为例

doi:10.11720/wtyht.2023.1618

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Abstract

Crust-mantle velocity structures,which provide an important basis for research on deep structures and dynamic mechanisms,are primarily determined using seismic tomography.A high-quality and fine-scale velocity reference model can provide an effective initial model and constraints for seismic tomography.However,existing methods for building a crust-mantle velocity reference model suffer some shortcomings,such as the lack of fine-scale building of the surface model and the partial distortion of the crust-mantle model caused by vertical global correction.To overcome these shortcomings,this study proposed an improved method for building a 3D crust-mantle velocity reference model.Firstly,the optimal Moho and sedimentary basement models were selected and constructed.Then,these boundary models were used to constrain and adjust the crust and upper mantle models vertically,including the linear correction and weighted fusion through partial compression and stretching.As a result,a crust-mantle medium model was established.Subsequently,the surface model was built in combination with prior geological data.Finally,these models were combined to construct a 3D crust-mantle velocity reference model.Using this method,this study built a 3D crust-mantle S-wave velocity reference model for the central South China Block by collecting previous crust-mantle structure models and geological data of the block.The comparative analysis shows that the model built in this study enjoys higher resolution and more accurate regional Moho,thus verifying the effectiveness of the method.This study provides a reliable 3D velocity reference model for the central South China Block.

Key words： South China Block crust and mantle velocity structure reference model

Received: 28 December 2022 Published: 11 October 2023

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	Zhong-Wei CHEN
	Liang-Hui GUO
	Yuan-Ke CHEN
	Han-Han TANG

Cite this article:

Zhong-Wei CHEN,Liang-Hui GUO,Yuan-Ke CHEN, et al. A method for building a 3D crust-mantle velocity reference model: A case study of the central South China Block[J]. Geophysical and Geochemical Exploration, 2023, 47(4): 936-943.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1618 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I4/936

The flowchart of constructing 3D velocity reference model of the crust-mantle
(The crustal interfaces represent the Moho and sedimentary interfaces)

Diagram of the partial "compression and stretching" correction of the crust-mantle structure vertically

The previous crust-mantle models

Density of rocks in South China block

Moho reference model of the central South China block
The white dotted line denotes the location of the profile AB

The S-wave velocity reference model of near-surface in the central South China block

The 3D S-wave velocity reference model of crust-mantle in the central South China block

Maps showing S-wave velocity structure of reference model at different depths in the central South China block

38] model;b—Han et al.^[47] model;c—Zhou et al.^[40] model;d—our model;The white line represents the Moho depth,the profile location is shown in fig.3
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Comparisons of different S-wave velocity models in profile AB
a—Shen et al.^[38] model;b—Han et al.^[47] model;c—Zhou et al.^[40] model;d—our model;The white line represents the Moho depth,the profile location is shown in fig.3

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