滨海复杂板块区域的地震动衰减关系探讨

发布时间：2019-04-11 08:30

【摘要】：随着全球滨海经济带的不断开发和建设,滨海区域逐渐地成为了人口集聚地和社会经济中心,这些地区的抗震设防问题也日益受到重视。滨海区域由于地理位置特殊、板块机制复杂,易受到不同类型地震的影响,因此,本文以日本滨海复杂板块区域不同类型地震的地震动为基础,探讨了其特征和衰减规律,主要研究内容如下:1、总结了国内外关于滨海区域地震动特征的研究现状、震源类型的分类标准以及衰减关系研究的常用方法。整理了日本滨海区域的地震动和场地资料,得到地震动参数和场地Vs30参数,建立了数据集;通过对数据集中的地震震级、震中距和震源深度的分析论证了数据集的合理性;基于数据集和典型衰减模型得到了滨海区域四类震源的衰减关系。2、采用模型检验和对比方法对建立的滨海复杂板块区域的地震动衰减模进行分析。通过模型检验分析表明拟合模型的标准差较小、残差分布均匀、没有明显的偏态,论证了模型的准确性。与已有衰减模型的对比分析表明了本文衰减模型的趋势及PGA和反应谱值的大小是合理的。3、对比建立的四类震源地震的衰减关系和预测反应谱,结果发现,四类震源的地震动衰减规律有明显的差异,其中上地幔地震的衰减速度最慢,PGA最小;俯冲带板缘地震和俯冲带板内地震的衰减规律相似,大小相近。对比四类震源地震的预测反应谱发现,预测反应谱在周期为0.1~0.3s时取得最大值,在短周期近场处,上地幔地震最小。4、分析了建立的近海地震动数据中几种典型的地震动,推荐了断层多次破裂、能量集中、长持时、典型震源和不同场地类别的典型地震动记录,为滨海场地的地震动输入提供参考。
[Abstract]:With the continuous development and construction of the global coastal economic belt, the coastal area has gradually become the population concentration area and the social economic center, and the seismic fortification problem in these areas has also been paid more and more attention. Because of its special geographical location and complex plate mechanism, the coastal area is susceptible to different types of earthquakes. Therefore, based on the ground motion of different types of earthquakes in the coastal complex plate area of Japan, this paper discusses its characteristics and attenuation law. The main research contents are as follows: 1. The research status of seismic features in coastal area, the classification criteria of source types and the common methods of attenuation relationship are summarized. In this paper, the ground motion and site data in the coastal area of Japan are sorted out, the ground motion parameters and site Vs30 parameters are obtained and the data set is established, and the rationality of the data set is proved by analyzing the magnitude, epicenter distance and focal depth of the data set. Based on the data set and the typical attenuation model, the attenuation relation of the four types of seismic sources in the coastal area is obtained. 2. The attenuation model of the seismic ground motion in the coastal complex plate area is analyzed by the method of model checking and comparison. The model test analysis shows that the standard deviation of the fitting model is small, the residual error distribution is uniform, and there is no obvious bias, and the accuracy of the model is proved. The comparison between the attenuation model and the existing attenuation model shows that the trend of the attenuation model and the value of PGA and response spectrum are reasonable. 3. The attenuation relation and the predicted response spectrum of the four types of focal earthquakes are established by comparison. The results show that the attenuation relationship and the predicted response spectrum of the four types of focal earthquakes are reasonable. There are obvious differences in the attenuation law of ground motion among the four types of sources, in which the attenuation velocity of upper mantle earthquakes is the slowest and the PGA is the smallest. The attenuation law of the subduction zone plate edge earthquake is similar to that of the subduction zone plate earthquake, and the magnitude of the subduction zone plate edge earthquake is similar. Comparing the predicted response spectra of four types of source earthquakes, it is found that the predicted response spectrum reaches the maximum when the period is 0.1? 0.3 s, and the upper mantle earthquake is the smallest at the near field of short period. Several typical ground motions in the established offshore ground motion data are analyzed, and the typical ground motion records of typical source and different site types are recommended for multiple rupture of faults, energy concentration, long duration, and so on. It provides a reference for the input of ground motion to the coastal site.
【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P315.9

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