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Chinese Journal of High Pressure Physics  > 2009  >  23(5): 338-344 .
CHEN Zhi, DU Jian-Guo, ZHOU Wen-Ge, LIU Yong-Gang, LI Ying. Wave Velocity and Attenuation Characteristics of Gabbro at 100～300 ℃ and 0.5～4.0 GPa[J]. Chinese Journal of High Pressure Physics, 2009, 23(5): 338-344 . doi: 10.11858/gywlxb.2009.05.004
Citation: CHEN Zhi, DU Jian-Guo, ZHOU Wen-Ge, LIU Yong-Gang, LI Ying. Wave Velocity and Attenuation Characteristics of Gabbro at 100～300 ℃ and 0.5～4.0 GPa[J]. Chinese Journal of High Pressure Physics, 2009, 23(5): 338-344 . doi: 10.11858/gywlxb.2009.05.004
shu

Wave Velocity and Attenuation Characteristics of Gabbro at 100～300 ℃ and 0.5～4.0 GPa

doi: 10.11858/gywlxb.2009.05.004
  • 1.

    Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China;

  • 2.

    Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China

More Information
  • Corresponding author: DU Jian-Guo
  • Received Date: 31 Dec 2008
  • Rev Recd Date: 20 Feb 2009
  • Publish Date: 15 Oct 2009
    Abstract
  • The variations of the elastic properties of gabbro at 100～300 ℃ and 0.5～4.0 GPa and the seismogeological application of the experimental results are discussed based on the measured wave velocities (vP,vS) and quality factors (QP,QS) of the gabbro. The values of vP,vS,QP and QS increase in the pressure range from 0.5 to 4.0 GPa at the given temperatures, but decrease slightly when the temperature increase from 100 to 300 ℃ at the given pressures. The variations of velocities and quality factors may be mainly attributed to the compression of the gabbro sample, and the continuity and elasticity of the sample become better at 0.5～2.3 GPa. The gabbro sample almost becomes continuous elastic medium at 2.3～4.0 GPa, resulting in smaller change of elastic wave velocities and attenuation. The wave velocities and quality factors decrease with increasing temperature because of thermal expansion and density decrease of gabbro. The experimental results can be used to explain the observed geophysical phenomena that the quality factor are enhanced by stress aggregation in the lithosphere, the quality factors may be reduced by rock fracturation and local enrichment of hot fluids in the epicentral areas before and after earthquake occurrence.

     

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