Anatomy of large earthquakes in North China

Hongli Li, You Tian, Dapeng Zhao, Dong Yan

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We present detailed 3-D isotropic P and S wave velocity (Vp, Vs) images and Vp azimuthal anisotropy in source areas of 26 large crustal earthquakes (M5.6–7.8) that occurred in North China during 1966 to 2021. Most of the large earthquakes are located in high-velocity (high-V) zones or close to the boundary between low-velocity (low-V) and high-V anomalies. Prominent low-V and high Poisson's ratio (high-σ) anomalies are revealed in the middle and lower crust under almost all the source areas, which may reflect crustal fluids. The low-V and high-σ anomalies may cause local thinning and weakening of the brittle seismogenic layer above them. The crustal fluids may originate from hot and wet upwelling flows in the big mantle wedge (BMW) beneath East Asia due to corner flows in the BMW and deep dehydration reactions of the stagnant Pacific slab in the mantle transition zone.

Original languageEnglish
Article number105342
JournalJournal of Asian Earth Sciences
Volume237
DOIs
Publication statusPublished - 2022 Oct 1

Keywords

  • Crustal structure
  • Earthquake dynamics
  • Intraplate seismicity and tectonics
  • North China
  • Seismic tomography

ASJC Scopus subject areas

  • Geology
  • Earth-Surface Processes

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