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Sun L N，Qi Y Y，Chen T，Wang X S. 2021. Research on application of focal mechanism and site conditions in judgment of Hebei earthquake influence field. Acta Seismologica Sinica，43（4）：508−520. DOI: 10.11939/jass.20200133
Citation: Sun L N，Qi Y Y，Chen T，Wang X S. 2021. Research on application of focal mechanism and site conditions in judgment of Hebei earthquake influence field. Acta Seismologica Sinica，43（4）：508−520. DOI: 10.11939/jass.20200133
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Research on application of focal mechanism and site conditions in judgment of Hebei earthquake influence field

  • Hebei Earthquake Agency，Shijiazhuang 050021，China

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  • Received Date: August 03, 2020
  • Revised Date: March 24, 2021
  • Available Online: August 15, 2021
  • Published Date: July 14, 2021
    Graphical Abstract
    • Abstract
  • The determination of seismic influence field in post-earthquake work, a quickly gived reasonable map of seismic intensity distribution, was an important basis for emergency rescue after the earthquake and was important for the government to understand the disaster situation, deploy work and estimate the disaster loss. In this paper, the isoseismal maps of moderate strong earthquakes in Hebei Province were collected and sorted out, it was compared with the theoretical isotherm map generated by the regional earthquake intensity attenuation relationship based on the focal mechanism solution. The results show that, with the increase of magnitude, the similarity was higher between the theoretical isoseismal map and the actual isoseismal map in the high intensity area （≥Ⅶ）, the theoretical isoseismal map was calculated by the attenuation relationship of seismic intensity with focal mechanism solution. In addition, according to the spatial variation of aftershock frequency within 24 hours after the earthquake, the theoretical isoseismal line in the polar region is modified, which is more consistent with the actual isoseismal line. That is to say, the theoretical calculated intensity is closer to the actual investigation intensity value. Finally, the grid of Hebei area was divided, and the bedrock PGA of the earthquake case on each grid center point was calculated according to the attenuation relationship of ground motion. Then, the site category attributes were extracted, considered site amplification factor, and the conversion of bedrock PGA to surface PGA was completed. The surface PGA was converted into intensity and compared with the actual earthquake isoseismal map. The results show that the similarity between the seismic influence field calculated by considering the site amplification effect and the actual isoseismal line was very high in the high intensity area, and the similarity is higher than the intensity attenuation relation method based on the focal mechanism solution.
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