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<p>The Sichuan-Yunnan region in Southwest China is a seismically active area, and ground motion models (GMMs) are an essential component of seismic hazard analysis in this region. This paper presents a horizontal GMM for Sichuan-Yunnan region, referred to as the SWC model, developed using a strong-motion dataset comprising 2,285 records collected between 2007 and 2022. The metadata in our dataset are compiled with high confidence, and the moment magnitudes of the events range from 3.5 to 7.9. The ground motion intensity measures including PGA, PGV, and acceleration response spectra from 0.01&#xa0;s to 10&#xa0;s. We used the model developed by Zhao (Bull Seismol Soc Am 106(4):1552–1569, 2016) as a reference to derive the SWC model. A bilinear magnitude-scaling term hinged at M<sub>W</sub> 7.1 is employed, along with a set of simple geometric attenuation functions to accommodate the relatively strong intensity of near-source records. The magnitude scaling rate for M<sub>W</sub> &gt; 7.1 events is selected from historical studies to better fit the 2008 Wenchuan earthquake. Site class based on <i>V</i><sub>S30</sub> is used to model site response due to the mixed sources of site data, with more than half sites having borehole information. Notable site resonance effects were observed in the site terms. Compared with the NGA-West models, the SWC model predicts larger short-period spectral accelerations for small-magnitude events and smaller long-period spectral accelerations for large events with Mw around 8.0. In comparison with previously developed models for this region, our model predicts higher-confidence near-source spectra, and significantly smaller between-event and within-event standard deviations at periods longer than about 0.4s.</p>

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An empirically regional ground motion model for earthquakes in Sichuan-Yunnan of Southwest China

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Ruibin Hou,
  • Yichen Pan,
  • John X. Zhao,
  • Hao Xing,
  • Kun Ji,
  • Junju Xie

摘要

The Sichuan-Yunnan region in Southwest China is a seismically active area, and ground motion models (GMMs) are an essential component of seismic hazard analysis in this region. This paper presents a horizontal GMM for Sichuan-Yunnan region, referred to as the SWC model, developed using a strong-motion dataset comprising 2,285 records collected between 2007 and 2022. The metadata in our dataset are compiled with high confidence, and the moment magnitudes of the events range from 3.5 to 7.9. The ground motion intensity measures including PGA, PGV, and acceleration response spectra from 0.01 s to 10 s. We used the model developed by Zhao (Bull Seismol Soc Am 106(4):1552–1569, 2016) as a reference to derive the SWC model. A bilinear magnitude-scaling term hinged at MW 7.1 is employed, along with a set of simple geometric attenuation functions to accommodate the relatively strong intensity of near-source records. The magnitude scaling rate for MW > 7.1 events is selected from historical studies to better fit the 2008 Wenchuan earthquake. Site class based on VS30 is used to model site response due to the mixed sources of site data, with more than half sites having borehole information. Notable site resonance effects were observed in the site terms. Compared with the NGA-West models, the SWC model predicts larger short-period spectral accelerations for small-magnitude events and smaller long-period spectral accelerations for large events with Mw around 8.0. In comparison with previously developed models for this region, our model predicts higher-confidence near-source spectra, and significantly smaller between-event and within-event standard deviations at periods longer than about 0.4s.