考虑不同场地类别的四川地区中小地震动衰减关系
发布时间：2018-08-14 13:57
【摘要】：自2008年中国数字台网中心运行以来四川省发生了多次强烈地震,不仅为我国提供了很多高质量的固定台站记录,还贡献了很多近场的流动台站记录,为我国研究四川地区的地震动衰减关系提供了良好的数据基础。在以往研究中由于流动台站无法按照常规方法进行场地分类致使大量地震动数据无法应用到衰减关系之中。本文将以四川境内固定台站以及汶川余震流动台站数据为基础,应用H/V谱比方法划分流动台站场地类型,分析固定台站与流动台站数据之间差异,并将流动台站数据应用到四川地区的衰减关系的回归之中,具体工作如下:1.收集整理四川地区固定台站的钻孔资料与Vs30数据,依据中国建筑抗震设计规范对场地类型的定义以及不同场地类型对应Vs30范围,划分了113个固定台站的场地类别。结合不同场地卓越周期以及反应谱形状特点,并应用H/V谱比方法划分了汶川余震监测的51个流动台站的场地类型。最终划分为Ⅰ类场地32个、Ⅱ类场地130个以及Ⅲ类场地2个。2.整理并筛选了2008-2015年间Ms3.5-6震中距200km以内四川地区的255次地震125个台站的强震记录,分析不同场地类型以及震级的分布特点,Ⅰ类场地主要集中在近场区域而Ⅱ类场地在各震中距段分布较为均匀。分析加速度峰值(PGA)与反应谱的分布特征,并对比了固定台站与流动台站消除几何扩散的平均反应谱曲线,发现流动台站的反应谱值在长周期段大于固定台站的反应谱值。3.将数据分为两组:一组仅含固定台站记录;一组同时包含固定和流动台站记录。根据数据特点调整模型,利用随机效应方法分别对两组数据进行衰减关系回归分析。对比两组数据的回归参数与结果发现,加入流动台站数据致使衰减关系的事件内残差变大。分析各震级段PGA与反应谱的残差,结果表明本文衰减关系可以很好的估计各震级段固定台站的地震动PGA与反应谱值,但是会低估流动台站的地震动参数。将本文结果与其他研究人员的四川区域衰减关系进行对比,发现本文的PGA预测结果与他人的结果较为近似,但本文较低的给出反应谱的预测值;总体上,本文衰减关系可以较好的体现四川地区地震动衰减特性。
[Abstract]:Since the operation of the China Digital Network Center in 2008, there have been many strong earthquakes in Sichuan Province, which not only provided China with a lot of high-quality records of fixed stations, but also contributed a lot of near-field mobile station records. It provides a good data base for studying the attenuation relation of ground motion in Sichuan area. In previous studies, a large number of ground motion data could not be applied to the attenuation relationship because the mobile stations could not classify the site according to the conventional method. Based on the data of fixed station and Wenchuan aftershock mobile station in Sichuan, this paper uses the method of H / V spectrum ratio to divide the site type of mobile station, and analyzes the difference between fixed station and mobile station data. The flow station data are applied to the regression of the attenuation relationship in Sichuan, and the specific work is as follows: 1. According to the definition of site type and the corresponding Vs30 range of different site types, 113 fixed stations are classified according to the definition of site type and the corresponding Vs30 range of different site types according to the definition of site type in Chinese Code for Seismic Design of buildings and the Vs30 data of fixed stations in Sichuan. According to the characteristic of outstanding period and response spectrum shape of different sites, the site types of 51 mobile stations monitored by Wenchuan aftershock are divided by using the method of H / V spectrum ratio. It was divided into 32 sites of class 鈪，
本文编号：2183080
[Abstract]:Since the operation of the China Digital Network Center in 2008, there have been many strong earthquakes in Sichuan Province, which not only provided China with a lot of high-quality records of fixed stations, but also contributed a lot of near-field mobile station records. It provides a good data base for studying the attenuation relation of ground motion in Sichuan area. In previous studies, a large number of ground motion data could not be applied to the attenuation relationship because the mobile stations could not classify the site according to the conventional method. Based on the data of fixed station and Wenchuan aftershock mobile station in Sichuan, this paper uses the method of H / V spectrum ratio to divide the site type of mobile station, and analyzes the difference between fixed station and mobile station data. The flow station data are applied to the regression of the attenuation relationship in Sichuan, and the specific work is as follows: 1. According to the definition of site type and the corresponding Vs30 range of different site types, 113 fixed stations are classified according to the definition of site type and the corresponding Vs30 range of different site types according to the definition of site type in Chinese Code for Seismic Design of buildings and the Vs30 data of fixed stations in Sichuan. According to the characteristic of outstanding period and response spectrum shape of different sites, the site types of 51 mobile stations monitored by Wenchuan aftershock are divided by using the method of H / V spectrum ratio. It was divided into 32 sites of class 鈪，
本文编号：2183080
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