Seismic structure and origin of active intraplate volcanoes in Northeast Asia

Yonghong Duan, Dapeng Zhao, Xiankang Zhang, Shaohong Xia, Zhi Liu, Fuyun Wang, Li Li

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

Three-dimensional P-wave velocity structure beneath the Changbai and other intraplate volcanic areas in Northeast Asia is determined by inverting 1378 high-quality P-wave arrival times from 186 teleseismic events recorded by 61 broadband seismic stations. Low-velocity (low-V) anomalies are revealed beneath the Changbai, Longgan, Xianjindao volcanoes. High-velocity (high-V) anomalies are found in the mantle transition zone, where deep-focus earthquakes under Hunchun occur at depths of 500-600 km. The high-V anomaly reflects the deep subduction of the Pacific slab under NE Asia which may have contributed to the formation of the Changbai, Longgang, Xianjindao and Jingpohu intraplate volcanoes. A low-V anomaly is also revealed in the mantle transition zone, which may have a close relationship with the occurrence of deep earthquakes under the Hunchun area. Our results support the Big Mantle Wedge (BMW) model by Zhao et al. [Zhao, D., Lei, J., Tang, Y., 2004. Origin of the Changbai volcano in northeast China: evidence from seismic tomography, Chin. Sci. Bull. 49, 1401-1408; Zhao, D., Maruyama, S., Omori, S., 2007. Mantle dynamics of western Pacific and East Asia: insight from seismic tomography and mineral physics. Gondwana Res. 11, 120-131.] who proposed that the intraplate volcanoes in NE Asia are caused by the back-arc magmatism associated with the deep dehydration process of the subducting slab and convective circulation process in the BMW above the stagnant Pacific slab.

Original languageEnglish
Pages (from-to)257-266
Number of pages10
JournalTectonophysics
Volume470
Issue number3-4
DOIs
Publication statusPublished - 2009 May 29

Keywords

  • Changbai volcano
  • Hunchun deep earthquakes
  • P-wave velocity structure
  • Stagnant Pacific slab
  • Teleseismic tomography

ASJC Scopus subject areas

  • Geophysics
  • Earth-Surface Processes

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