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Acta Seismologica Sinica

, Volume 13, Issue 5, pp 507–515 | Cite as

Present-day tectonic movement in the northeastern margin of the Qinghai-Xizang (Tibetan) plateau as revealed by earthquake activity

  • Xu Zhong-huai 
  • Wang Su-yun 
  • Gao A-jia 
Article

Abstract

Characteristics of present-day tectonic movement in the northeastern margin of Qinghai-Xizang plateau (Tibetan) are studied based on earthquake data. Evidence of earthquake activity shows that junctures between blocks in this area consist of complicated deformation zones. Between the Gansu-Qinghai block and Alxa block there is a broad compressive deformation zone, which turns essentially to be a network-like deformation region to the southeast. The Liupanshan region, where the Gansu-Qinghai block contacts the Ordos block, is suffering from NE-SW compressive deformation. Junction zone between the Ordos and Alxa block is a shear zone with sections of variable trend. The northwestern and southeastern marginal region of the Ordos is under NNW-SSE extension. The above characteristics of present-day tectonic deformation of the northeastern Qinghai-Xizang plateau may be attributed to the northeastward squeezing of the plateau and the resistance of the Ordos block, as well as the southeastward extrusion of the plateau materials.

Key words

northeastern Qinghai-Xizang (Tibetan) plateau tectonic movement earthquake 

CLC number

P546 

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Copyright information

© Acta Seismologica Sinica 2000

Authors and Affiliations

  • Xu Zhong-huai 
    • 1
  • Wang Su-yun 
    • 1
  • Gao A-jia 
    • 1
  1. 1.Institute of GeophysicsChina Seismological BureauBeijingChina

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