First local seismic tomography for Red River shear zone, northern Vietnam: Stepwise inversion employing crustal P and Pn waves

Hsin Hua Huang, Zhen J. Xu, Yih Min Wu, Xiaodong Song, Bor Shouh Huang, Le Minh Nguyen

Research output: Contribution to journalArticlepeer-review

Abstract

The 900-km-long Red River shear zone (RRSZ) lends a compelling support to the continental extrusion model for the tectonic evolution of southeastern Asia, but has been challenged by many of views, as some new records mainly from northern Vietnam, suspecting the dimensions of RRSZ neither in depth nor in displacement are as large as we expected before. However, compared to the northwestern half of the RRSZ in Yunnan province better studied by many fields, the southeastern half in northern Vietnam is relatively poorly constrained by seismic study, due to insufficient stations and data in the past. This study, using a newly deployed portable broadband seismic network, obtained the first local seismic tomography with a stepwise inversion using P and Pn phases. Surface geology, major structures, and rock properties are well correlated and identified in our model, suggesting the RRSZ is a lithospheric structure at least penetrating to the uppermost mantle with mantle thermal anomalies. In general, the crust of northern Vietnam appears to be weak and sits on a relatively hot uppermost mantle, showing a long and complex thermo tectonic history. A mid-lower crustal segmentation of RRSZ is also proposed to compromise the discrepancies recently observed between Yunnan province and northern Vietnam.

Original languageEnglish (US)
Pages (from-to)230-239
Number of pages10
JournalTectonophysics
Volume584
DOIs
StatePublished - Jan 22 2013

Keywords

  • Local seismic tomography
  • Moho depth
  • Northern Vietnam
  • P wave
  • Red River shear zone

ASJC Scopus subject areas

  • Geophysics
  • Earth-Surface Processes

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