P-wave tomography and origin of the Changbai intraplate volcano in Northeast Asia

Jianshe Lei, Dapeng Zhao

Research output: Contribution to journalArticlepeer-review

233 Citations (Scopus)

Abstract

We present the first seismic image of the upper mantle beneath the active intraplate Changbai volcano in Northeast Asia determined by teleseismic travel time tomography. The data are measured at a new seismic network consisting of 19 portable stations and 3 permanent stations. Our results show a columnar low-velocity anomaly extending to 400-km depth with a P-wave velocity reduction of up to 3%. High velocity anomalies are visible in the mantle transition zone, and deep-focus earthquakes occur at depths of 500-600 km under the region, suggesting that the subducting Pacific slab is stagnant in the transition zone, as imaged clearly by global tomography. These results suggest that the intraplate Changbai volcano is not a hotspot like Hawaii but a kind of back-arc volcano related to the deep subduction and stagnancy of the Pacific slab under Northeast Asia.

Original languageEnglish
Pages (from-to)281-295
Number of pages15
JournalTectonophysics
Volume397
Issue number3-4
DOIs
Publication statusPublished - 2005 Mar 16
Externally publishedYes

Keywords

  • Changbai volcano
  • Intraplate volcanism
  • Subducted Pacific slab
  • Teleseismic travel time tomography

ASJC Scopus subject areas

  • Geophysics
  • Earth-Surface Processes

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