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<p>This study investigates regional ground-motion characteristics in Yunnan Province using 1,065 recordings from 60 small-to-moderate earthquakes (3.0 ≤ <i>M</i><sub>w</sub> ≤ 6.0) at 65 stations. A generalized inversion technique (GIT) using empirical reference site was applied to four tectonically distinct subregions (A–D). The inversion results reveal stress drops (Δ<i>σ</i>) ranging from 0.3 to 7.34&#xa0;MPa, with the highest averages in Regions C and D (2.21&#xa0;MPa), followed by Region A (2.07&#xa0;MPa) and Region B (1.16&#xa0;MPa). Δ<i>σ</i> shows no clear dependence on moment magnitude (<i>M</i><sub>w</sub>) or focal depth but correlates with surface heat flow. Reverse-faulting events exhibit a higher average Δ<i>σ</i> than strike-slip and normal-faulting events. Quality factor models for the four study areas (A–D) are 118.41<i>f</i> <sup>0.691</sup>, 120.26<i>f</i> <sup>0.638</sup>, 77.20<i>f</i> <sup>0.598</sup> and 72.19<i>f</i> <sup>0.861</sup>, respectively. The eastern regions (C and D) exhibit lower <i>Q</i><sub>0</sub> and stronger S-wave attenuation, along with higher tectonic activity and lower surface heat flow. The predominant frequencies of average site amplification for GMX-A, GMX-B, GMX-C and GMX-D are 20.00&#xa0;Hz, 10.83&#xa0;Hz, 3.97&#xa0;Hz, and 1.92&#xa0;Hz, with corresponding amplification factors of 2.84, 4.31, 5.45, and 7.69. Finally, the inversion parameters were validated through stochastic finite-fault simulations of the 2009 <i>M</i><sub>S</sub> 6.3 Yao’an mainshock.</p>

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Ground-motion heterogeneity across four subdomains in Yunnan, China revealed by generalized spectral inversion

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  • 发表日期：

    2025年11月18日

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  • Ziyan Wang,
  • Xiaojun Li,
  • Lei Fu,
  • Su Chen,
  • Kelin Chen,
  • Yiming He

摘要

This study investigates regional ground-motion characteristics in Yunnan Province using 1,065 recordings from 60 small-to-moderate earthquakes (3.0 ≤ Mw ≤ 6.0) at 65 stations. A generalized inversion technique (GIT) using empirical reference site was applied to four tectonically distinct subregions (A–D). The inversion results reveal stress drops (Δσ) ranging from 0.3 to 7.34 MPa, with the highest averages in Regions C and D (2.21 MPa), followed by Region A (2.07 MPa) and Region B (1.16 MPa). Δσ shows no clear dependence on moment magnitude (Mw) or focal depth but correlates with surface heat flow. Reverse-faulting events exhibit a higher average Δσ than strike-slip and normal-faulting events. Quality factor models for the four study areas (A–D) are 118.41f 0.691, 120.26f 0.638, 77.20f 0.598 and 72.19f 0.861, respectively. The eastern regions (C and D) exhibit lower Q0 and stronger S-wave attenuation, along with higher tectonic activity and lower surface heat flow. The predominant frequencies of average site amplification for GMX-A, GMX-B, GMX-C and GMX-D are 20.00 Hz, 10.83 Hz, 3.97 Hz, and 1.92 Hz, with corresponding amplification factors of 2.84, 4.31, 5.45, and 7.69. Finally, the inversion parameters were validated through stochastic finite-fault simulations of the 2009 MS 6.3 Yao’an mainshock.