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Regional differences in attenuation modelling for Eastern China

机译：中国东部衰减模型的区域差异

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摘要

This paper describes the development of seismological models for three sub-regions within Eastern China. An important feature of the modelling is that two main types of local data were used to determine parameters for input into the seismological model. Shear wave velocity data was used in Step One of the procedure for deriving the upper crustal factors which are part of the seismological model. Two further steps were involved in incorporating the historical Intensity (MMI) data into the modelling. In Step Two, the simulated peak ground velocity (PGV) values were converted to MMI values, and site factor was calculated by dividing the inferred PGV value by the respective simulated PGV value for each given (short distance) earthquake scenario. In Step Three, the quality (Q) factor of the seismological model for each sub-region was calibrated in accordance with the criterion that site factors inferred from records of long distance earthquakes in the database match with the median site factor obtained in Step Two for short distance earthquakes. Importantly, the Q values obtained by this calibration method were highly consistent with Coda Q values (obtained for each sub-region from a previous study by Jin and Aki based on analysing records of local earth tremors). The calibrated Q values in combination with the developed crustal factors and geometrical attenuation factor constitute the regional seismological model for Eastern China. The seismological model so developed takes into account intra-regional differences and has been used to simulate strong ground motions by the stochastic method for assessing the potential seismic hazards in the region.
机译：本文描述了中国东部三个分区的地震学模型的发展。建模的一个重要特征是使用了两种主要类型的本地数据来确定输入地震模型的参数。在该程序的第一步中使用了剪切波速度数据来推导地震模型中上地壳因子。将历史强度（MMI）数据合并到建模中还涉及两个步骤。在第二步中，将模拟峰值地面速度（PGV）值转换为MMI值，并针对每个给定的（短距离）地震场景，通过将推断的PGV值除以相应的模拟PGV值来计算站点因子。在第三步中，根据以下标准对每个子区域的地震模型的质量（Q）因子进行校准：从数据库中的长途地震记录推断出的站点因子与第二步中获得的中值站点因子相匹配。短距离地震。重要的是，通过这种校准方法获得的Q值与Coda Q值高度一致（Coda Q值（每个子区域均是根据分析当地地震记录由Jin和Aki先前的研究获得的）。校准后的Q值与发达的地壳因子和几何衰减因子共同构成了中国东部地区的地震学模型。这样开发的地震学模型考虑了区域内的差异，并已被用于通过随机方法来模拟强地面运动，以评估该区域的潜在地震危险。

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  • 来源
    《Journal of Asian earth sciences》 |2010年第5期|P.441-459|共19页
  • 作者

    H.H. Tsang; M.N. Sheikh; N.T.K. Lam; A.M. Chandler; S.H. Lo;

  • 作者单位

    Department of Civil Engineering, University of Hong Kong, Pokfulam Road, Hong Kong;

    rnSchool of Civil, Mining and Environmental Engineering, University of Wollongong, NSW 2522, Australia;

    rnDepartment of Civil and Environmental Engineering, University of Melbourne, VIC 3010, Australia;

    rnSchool of Civil Engineering and the Environment, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom;

    rnDepartment of Civil Engineering, University of Hong Kong, Pokfulam Road, Hong Kong;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    seismological model; attenuation; quality (Q) factor; soil site; intensity; Eastern China;

    机译：地震模型衰减;质量（Q）因子;土壤部位强度;中国东部;

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