强震数据Kappa值影响因素的讨论
发布时间：2018-12-27 16:34
【摘要】：许多研究表明,加速度傅里叶幅值谱会在高频段出现快速下降这一现象,Anderson与Hough定量地研究了在拐角频率之上的加速度傅里叶谱的衰减规律,利用谱衰减参数Kappa(κ)来描述这一现象。κ在工程地震领域有着重要应用,被地震学家和工程师广泛、大量地用于震源、地震动模拟和衰减关系等工作。随着地震学方法的广泛使用,越来越多学者研究和讨论κ值的影响因素和确定方法,不同学者使用不同数据得到的结论也不同,κ值可能与震源特性(震级和震源机制)、场地条件及传播途径等因素有关,但目前仍没有得到一致的结论。本论文重点探讨κ值的影响因素。在κ被引入工程地震领域三十多年中,不同的学者提出了不同的计算方法,有的适用于强震,有的适用于中小震,有的适用于微震。本文采用的是震级4.5以上的强震,选用AndersonHough经典计算方法、固定应力降计算方法以及宽带反演方法计算κ值。以日本东北地区(36°N-40°N,138°E-143°E)为研究区,收集2011年1月至2014年1月间震级大于4.5的512次地震的151个KiK-net(地表和井下)与189个K-NET台站的记录。讨论传播途径、震级以及局部场地特性对上述三种方法得到的κ值的影响。研究发现,κ值与震中距有一定的线性关系,但离散性较大,κ值随着距离的增加而增加,KiK-net井下数据结果的线性关系最为明显;对每一次地震,线性回归所有台站的κ值与震中距,截距的κ值(κs)表示震中附近的κ值,分析其与震级的关系,线性回归关系不显著,震级的影响不大;对每一个台站,线性回归所有κ值与震中距,截距的κ值(κ0)表示台站附近的κ值,分析其与30m平均剪切波速VS30和整个钻孔深度的平均剪切波速VSd的关系,κ0随着平均剪切波速的增加而降低,呈对数关系,但离散性较大,VS30对κ0的解释能力强于VSd。最后,本文总结了主要工作,展望了今后工作,并对地震动衰减关系的研究中的一个逻辑问题做了初步探讨。
[Abstract]:Many studies have shown that the acceleration Fourier amplitude spectrum will decrease rapidly in the high frequency band. Anderson and Hough have quantitatively studied the attenuation law of the acceleration Fourier spectrum above the corner frequency. The spectral attenuation parameter Kappa (魏) is used to describe this phenomenon. 魏 is widely used by seismologists and engineers in the field of engineering seismology, and is widely used in the work of source, earthquake simulation and attenuation. With the wide use of seismological methods, more and more scholars study and discuss the influencing factors and determining methods of 魏 value, and different scholars use different data to get different conclusions. The 魏 value may be associated with the source characteristics (magnitude and focal mechanism). The site condition and the way of transmission are related, but there is still no consistent conclusion. This paper focuses on the influencing factors of 魏 value. In the more than 30 years since 魏 was introduced into the field of engineering earthquake, different scholars have put forward different calculation methods, some of them are suitable for strong earthquakes, some are suitable for small and medium earthquakes, and some are suitable for microearthquakes. In this paper, a strong earthquake with magnitude 4. 5 is used. The classical AndersonHough method, the fixed stress drop calculation method and the wideband inversion method are used to calculate the 魏 value. In this paper, 151 KiK-net (surface and underground) and 189 K-NET stations of 512 earthquakes with magnitude greater than 4.5 between January 2011 and January 2014 were collected from northeast Japan (36 掳N-40 掳Nian 138 掳E-143 掳E). The effects of propagation path magnitude and local site characteristics on the 魏 values obtained by the above three methods are discussed. It is found that there is a linear relationship between 魏 value and epicentral distance, but the dispersion is larger. The 魏 value increases with the increase of distance, and the linear relationship between the results of KiK-net downhole data is the most obvious. For each earthquake, the 魏 value and epicentral distance of all stations are linear regression, and the 魏 value (魏 s) of intercept denotes the 魏 value near the epicenter. The linear regression relation is not significant, but the influence of magnitude is not significant. For each station, the linear regression of all 魏 values and epicentral distance, the 魏 value of intercept (魏 0) represents the 魏 value near the station, and the relationship between 魏 value and the average shear wave velocity (VS30) of 30 m and the average shear wave velocity (VSd) of the whole borehole depth is analyzed. 魏 0 decreases with the increase of average shear wave velocity, which is logarithmic, but its dispersion is larger. VS30 has a stronger ability to interpret 魏 0 than VSd.. Finally, this paper summarizes the main work, looks forward to the future work, and makes a preliminary discussion on a logic problem in the study of the attenuation relationship of ground motion.
【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】：2016
【分类号】：P315.9
本文编号：2393318
[Abstract]:Many studies have shown that the acceleration Fourier amplitude spectrum will decrease rapidly in the high frequency band. Anderson and Hough have quantitatively studied the attenuation law of the acceleration Fourier spectrum above the corner frequency. The spectral attenuation parameter Kappa (魏) is used to describe this phenomenon. 魏 is widely used by seismologists and engineers in the field of engineering seismology, and is widely used in the work of source, earthquake simulation and attenuation. With the wide use of seismological methods, more and more scholars study and discuss the influencing factors and determining methods of 魏 value, and different scholars use different data to get different conclusions. The 魏 value may be associated with the source characteristics (magnitude and focal mechanism). The site condition and the way of transmission are related, but there is still no consistent conclusion. This paper focuses on the influencing factors of 魏 value. In the more than 30 years since 魏 was introduced into the field of engineering earthquake, different scholars have put forward different calculation methods, some of them are suitable for strong earthquakes, some are suitable for small and medium earthquakes, and some are suitable for microearthquakes. In this paper, a strong earthquake with magnitude 4. 5 is used. The classical AndersonHough method, the fixed stress drop calculation method and the wideband inversion method are used to calculate the 魏 value. In this paper, 151 KiK-net (surface and underground) and 189 K-NET stations of 512 earthquakes with magnitude greater than 4.5 between January 2011 and January 2014 were collected from northeast Japan (36 掳N-40 掳Nian 138 掳E-143 掳E). The effects of propagation path magnitude and local site characteristics on the 魏 values obtained by the above three methods are discussed. It is found that there is a linear relationship between 魏 value and epicentral distance, but the dispersion is larger. The 魏 value increases with the increase of distance, and the linear relationship between the results of KiK-net downhole data is the most obvious. For each earthquake, the 魏 value and epicentral distance of all stations are linear regression, and the 魏 value (魏 s) of intercept denotes the 魏 value near the epicenter. The linear regression relation is not significant, but the influence of magnitude is not significant. For each station, the linear regression of all 魏 values and epicentral distance, the 魏 value of intercept (魏 0) represents the 魏 value near the station, and the relationship between 魏 value and the average shear wave velocity (VS30) of 30 m and the average shear wave velocity (VSd) of the whole borehole depth is analyzed. 魏 0 decreases with the increase of average shear wave velocity, which is logarithmic, but its dispersion is larger. VS30 has a stronger ability to interpret 魏 0 than VSd.. Finally, this paper summarizes the main work, looks forward to the future work, and makes a preliminary discussion on a logic problem in the study of the attenuation relationship of ground motion.
【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】：2016
【分类号】：P315.9
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1 朱百慧;强震数据Kappa值影响因素的讨论[D];中国地震局工程力学研究所;2016年
，本文编号：2393318
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