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Focal Mechanism and Source Parameters Analysis of Mining-Induced Earthquakes Based on Relative Moment Tensor

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  • 1School of Mines, China University of Mining & Technology, Xuzhou 221116, China.

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|June 24, 2022
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Mining-induced earthquakes (MIEs) in coal mines can cause rock bursts. This study analyzed MIE focal mechanisms and source parameters, revealing distinct rupture types and their influence on geological structures and stress release.

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Area of Science:

  • * Seismology
  • * Mining Engineering
  • * Rock Mechanics

Background:

  • * Mining-induced earthquakes (MIEs) are common in underground coal mines, often triggering rock bursts.
  • * The precise mechanisms driving MIEs and their relationship to rock bursts remain unclear.
  • * Understanding MIE focal mechanisms is crucial for mitigating mining hazards.

Purpose of the Study:

  • * To investigate the focal mechanism and source parameter laws of MIEs in three high rock burst incidence areas.
  • * To analyze how geological structure, stress environment, and source depth influence MIE characteristics.
  • * To differentiate between tensile and shear rupture types and their implications for rock burst risk.

Main Methods:

  • * Employed relative moment tensor inversion (MTI) to analyze MIEs.
  • * Modified the construction of the inversion matrix for improved accuracy.
  • * Developed an optimized criterion for identifying source rupture types based on ray and source number conditions.

Main Results:

  • * Focal mechanisms are influenced by geological structure, stress, and source horizon.
  • * Tensile sources occur in roofs and coal seams; shear sources are mainly in coal seams.
  • * Shear sources in fault areas show higher seismic moment but lower energy; tensile sources indicate residual stress in roofs.

Conclusions:

  • * Different geological settings (fold, fault, pillar areas) exhibit distinct MIE characteristics.
  • * Tensile and shear rupture types have varying impacts on stress release and disturbance scale.
  • * Findings enhance understanding of rock burst mechanisms and inform MIE prevention strategies.