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Site response and attenuation analyses using strong motion and short-period data.

机译：使用强运动和短周期数据进行站点响应和衰减分析。

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摘要

Site amplification and seismic attenuation are analyzed in this study using strong ground motion records and short period records.; Site amplification factors at instrumented free-field sites are inferred from recorded motions using: (1) Generalized Inversion of S-waves; (2) the H/V method (i.e., the ratio of the spectral amplitudes of the horizontal and vertical components of motion); (3) Coda-wave Inversion; (4) the Standard Spectral Ratio method; and (5) the Coda Normalization method. The site amplification factors inferred from the above methods are compared to each other. The amplification factors obtained from the Generalized Inversion are validated by the other four methods. The correlation of site amplification to site condition is also analyzed and the results demonstrate that site amplification appears to be stronger for the geologically younger (and thus softer) sediments, and the site classification in conformance with UBC provisions provides smaller scatter than the classification based on geological formation. The site amplification factors for the different site classes of the NEHRP classification (i.e., site class C, D and E), which is important for engineering application, are provided and compared with the values proposed by Borcherdt (1994) and adopted in the 1997 UBC and 2003 IBC design codes. The agreement between the site amplification obtained in this study and those proposed by Borcherdt (1994) and adopted by the design codes is good. The nonlinearity of site amplification, resulting from the intensity of ground motion, is clearly identified at selected station where this is feasible.; The intrinsic and scattering attenuation are analyzed at stations SML and TYC using the Multiple Lapse Time Window (MLTW) method. The total attenuation is derived from the intrinsic and scattering attenuation. The coda attenuation is analyzed for 14 stations from coda decay curves using linear regression. The S-wave attenuation is analyzed using the coda normalization method at the stations SML and TYC. The coda attenuation estimated from the coda decay curves is close to the intrinsic attenuation. The intrinsic attenuation is the dominant component in the total attenuation. The total attenuation, estimated using the MLTW method, closely agrees with the results from the Coda Normalization Method. The scattering coefficient is estimated to be 3--8 x 10 -3km-1, consistent with estimates of this parameter for other tectonically active regions (see figure 3.10 in Sato and Fehler, 1998).; The data sets used in this study are collected from a strong motion network and a short period network in Taiwan province, China. The strong motion data set contains: (1) 2751 motions recorded at 407 stations from 33 aftershocks ranging from ML = 4.11--6.80 and depths from 1.05km to 21.28km, following 1999 Chi-Chi earthquake; and (2) 410 motions recorded at 410 stations from the main event of 1999 Chi-Chi earthquake. The short period data set contains 5499 records recorded by 71 stations instrumented with the Teledyne S-13 seismometers. The 108 events have a magnitude ranging from ML = 2.90--4.97, and depths from 2.21km to 30.82km; these events occurred over a period of time from 2000 to 2003.
机译：在这项研究中，使用强大的地面运动记录和短期记录来分析场地放大和地震衰减。使用以下方法从记录的运动中推断仪器化自由场站点的站点放大因子：（1）S波的广义反演； （2）H / V方法（即，运动的水平分量和垂直分量的频谱幅度之比）； （3）尾波反演； （4）标准光谱比法； （5）Coda标准化方法。将通过上述方法推断出的位点扩增因子进行比较。通过其他四种方法验证了从广义反演获得的放大因子。还分析了位点放大与位点条件的相关性，结果表明，对于地质上较年轻（因而较软）的沉积物，位点放大似乎更强，并且与UBC规定相符的位点分类比基于地质构造。提供了对工程应用很重要的NEHRP分类不同站点类别（即站点类别C，D和E）的站点放大因子，并将其与Borcherdt（1994）提出并于1997年采用的值进行了比较。 UBC和2003 IBC设计规范。在这项研究中获得的位点扩增与由Borcherdt（1994）提出并由设计规范采用的位点扩增之间的一致性很好。在可行的情况下，在选定的站点可以清楚地识别出由于地震动强度引起的站点放大的非线性。使用多重间隔时间窗（MLTW）方法在SML和TYC站分析了固有衰减和散射衰减。总衰减从固有衰减和散射衰减得出。使用线性回归从尾声衰减曲线分析了14个站点的尾声衰减。在站点SML和TYC处使用尾声归一化方法分析了S波衰减。从尾声衰减曲线估计的尾声衰减接近于固有衰减。本征衰减是总衰减中的主要成分。使用MLTW方法估算的总衰减与Coda归一化方法的结果非常吻合。散射系数估计为3--8 x 10 -3km-1，与其他构造活动区域对该参数的估计一致（参见Sato和Fehler，1998年的图3.10）。本研究中使用的数据集来自中国台湾省的强运动网络和短期网络。强运动数据集包含：（1）自1999年集集地震以来，在ML = 4.11--6.80，深度从1.05km至21.28km的33次余震中，在407个台站记录了2751次运动； （2）自1999年集集地震主要事件以来，在410个站点记录了410个运动。短期数据集包含由Teledyne S-13地震仪安装的71个站记录的5499条记录。这108个事件的震级范围为ML = 2.90--4.97，深度为2.21 km至30.82 km;这些事件发生在2000年至2003年的一段时间内。

著录项

  • 作者

    Zhang, Fangyin.;

  • 作者单位

    State University of New York at Buffalo.;

  • 授予单位 State University of New York at Buffalo.;
  • 学科 Geophysics.; Engineering Civil.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 277 p.
  • 总页数 277
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地球物理学;建筑科学;
  • 关键词

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