<p>The rapid development in the western region of Hubei Province, China, has exacerbated artificial seismic activities through large-scale engineering activities, especially the impoundment of the Three Gorges Reservoir and the extraction of shale gas. The region spans the tectonic complexity of the Qinling Fold Belt and the Yangtze Paraplatform, which has limited the applicability of traditional attenuation relationship models for natural earthquakes. This study aims to establish specific ground motion attenuation relationship models for tectonic earthquakes and induced earthquakes in this region by systematically analyzing the regional seismic genesis mechanisms. This study, by introducing corrections for crustal inhomogeneity, improves the classical elliptical attenuation model and realizes the mutual conversion of attenuation relationships based on seismic intensity and physical parameters (Peak Ground Acceleration, PGA, and Spectral Acceleration). Verification based on measured seismic events shows that there is good consistency in the prediction of the macroscopic seismic intensity distribution. However, there is a systematic underestimation of PGA in the near-field high-frequency domain, and the reasons for this systematic PGA underestimation in the near-field high-frequency domain are analyzed in detail. This research provides crucial support for seismic design and risk assessment in this region, and also points out the areas for future model improvement.</p>

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Study on Ground Motion Attenuation Relations for Tectonic and Induced Earthquakes in Western Hubei Region, China

  • Guang-qin Tong,
  • Li-fen Zhang,
  • Jun Geng,
  • Wei-bing Qin,
  • Yan-nan Zhao,
  • Jing-gang Li

摘要

The rapid development in the western region of Hubei Province, China, has exacerbated artificial seismic activities through large-scale engineering activities, especially the impoundment of the Three Gorges Reservoir and the extraction of shale gas. The region spans the tectonic complexity of the Qinling Fold Belt and the Yangtze Paraplatform, which has limited the applicability of traditional attenuation relationship models for natural earthquakes. This study aims to establish specific ground motion attenuation relationship models for tectonic earthquakes and induced earthquakes in this region by systematically analyzing the regional seismic genesis mechanisms. This study, by introducing corrections for crustal inhomogeneity, improves the classical elliptical attenuation model and realizes the mutual conversion of attenuation relationships based on seismic intensity and physical parameters (Peak Ground Acceleration, PGA, and Spectral Acceleration). Verification based on measured seismic events shows that there is good consistency in the prediction of the macroscopic seismic intensity distribution. However, there is a systematic underestimation of PGA in the near-field high-frequency domain, and the reasons for this systematic PGA underestimation in the near-field high-frequency domain are analyzed in detail. This research provides crucial support for seismic design and risk assessment in this region, and also points out the areas for future model improvement.