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EARTHQUAKE ›› 2012, Vol. 32 ›› Issue (3): 87-97.

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On Relation between Earthquakes and Deep Structure and the Fracture Mechanism in North China

ZHANG Lu   

  1. Institute of Crustal Dynamics, CEA, Beijing 100085, China
  • Received:2011-11-10 Revised:2012-03-08 Published:2021-08-19

Abstract: Seismicity in North China has been very active. The particularity of deep crustal structure determines the activity of earthquakes there. Studies of many geoscience transects and seismic survey profiles indicated that there bodies of low-velocity media in crust or the top anomalous uplifts of the upper mantle are in the seismic zone (i.e. the active tectonic zone) of North China. Detailed geophysical surveys in strong earthquake districts discovered the bodies of low-velocity media in crust or the top anomalous uplifts of the upper mantle too. Using stress Mohr circle and Coulomb failure criteria, this paper presents uplift model and crust-thinning model to study the crust fracture mechanism in North China. The result indicates that the crust would like to fracture if the uplift of the upper mantle or bodies of low-velocity media in crust exist in this region.

Key words: Earthquake in north China, Deep structure, Fracture mechanism

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