Crustal radial anisotropy in Northeast China and its implications for the regional tectonic extension

Zhen Guo, Yingjie Yang*, Y. John Chen

*Corresponding author for this work

Research output: Contribution to journalArticle

8 Citations (Scopus)
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Abstract

We obtain high-resolution Rayleigh and Love wave phase velocity maps from ambient noise tomography using data recorded by NECESSArray in Northeast China. The resulting radial anisotropic model from the joint inversion of Rayleigh and Lovewave dispersion curves reveals strong relationship between the crustal radial anisotropy and tectonic provinces, that is, strong positive anisotropy (Vsh > Vsv) beneath the Songliao Basin and weak radial anisotropy beneath the Xinmeng Belt and Changbaishan Region. The Songliao Basin experienced widespread crustal extension during the late Mesozoic. We interpret the lower crustal anisotropy beneath the Songliao Basin as a result of ductile deformation during the rifting stage, which may lead to the alignment of anisotropic minerals and the observed strong radial anisotropy at present. In the northern Songliao Basin, where thick syn-rift and post-rift sediments (≥4 km) are believed to be present, we observe a broader lateral distribution of anisotropy with stronger amplitude compared with the southern basin.We suggest that the broader distribution of crustal radial anisotropy in the northern basin could be the consequence of outward lower crustal flow driven by the sedimentary loading during the post-rift stage,which is also proposed by previous numerical modeling.

Original languageEnglish
Article numberggw261
Pages (from-to)197-208
Number of pages12
JournalGeophysical Journal International
Volume207
Issue number1
DOIs
Publication statusPublished - 1 Oct 2016

Bibliographical note

This article has been accepted for publication in Geophysical Journal International ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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