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Research on the attenuation characteristics of 1 second or shorter period earthquake ground motion in the Kanto-Tokai districts in Japan

日本关东东海地区1秒或更短周期地震地震动衰减特性研究

基本信息

批准号：
02650416
负责人：
NAGAHASHI Sumio
金额：
$ 1.34万
依托单位：
Nagasaki Institute of Applied Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

Since 1979, the Research Committee of Strong-Motion Earthquake Instrument Arrays on Rock Sites has continued the seismological array observation in and around the Tokyo metropolitan area of Japan. The four main sites, that is, Higasi-matsuyama in Saitama Pref., Choshi and Tateyama in Chiba Pref. and SHuzenji Site in Izu Peninsula were set in 1978, and the three supplementary sites were added in 1983. The four main sites have the local array network respectively, so the present total number of observation points is 21 points. Since the beginning of the observation, a lot of seismograms have been recorded. Out of the total data set, only the accelerograms with comparatively large amplitude were used for the data set in this study, that is, 4966 accelerograms recorded in 305 earthquake events were used for analyses.In the first place, the empirical formula of ground motion attenuation was proposed in frequency domain. Ground motion attenuation may be represented by the following formula.log_<10>Sv(T)=A(T)-M+[B(T)-X+log_<10>X]+C(T)+DELTA_<ij>(T)Here, Sv(T), M and X represent velocity response spectrum, earthquake magnitude and hypocentral distance, respectively, and A(T), B(T)and C(T)are the regression coefficients. B(T)may be transformed into Q-values, and after then the Q values were compared to those by the past seismological research. As the result of the regression analyses, the Q values in the Kanto-Tokai districts of the Central Japan were evaluated as the function of frequency of ground motion, and it was shown that the Q values are proportional to frequency with the exponent of 0.73, that is, Q(f)*f^<0.73>.In conclusion, using these empirical formulae as the standard scale for evaluation of ground motion intensity in frequency domain, a simple method to understand the regional characteristics with respect to ground motion attenuation was proposed.

自1979年以来，岩石场地强震台阵研究委员会继续在日本东京都及周边地区进行地震台阵观测。四个主要遗址，即崎玉县的东松山、千叶县的中山和立山。和伊豆半岛的修禅寺遗址设立于1978年，这三个补充遗址于1983年增加。四个主要测点分别具有局部阵网，因此目前的观测点总数为21个点。自观测开始以来，记录了大量的地震记录。在全部数据中，本研究只使用了幅度较大的加速度记录，即使用了305个地震事件的4966个加速度记录进行分析。地震动衰减可用formula.log_&lt；10&gt；Sv(T)=A(T)-M+[B(T)-X+log_&lt；10&gt；X]+C(T)+DELTA_&lt；ij&gt；(T)Here，Sv(T)表示，M和X分别表示速度反应谱、震级和震中距离，A(T)、B(T)和C(T)是回归系数。B(T)可以转换为Q值，然后将Q值与以往地震学研究的Q值进行比较。作为回归分析的结果，对日本中部关东地区的Q值作为地震动频率的函数进行了估计，结果表明，Q值与频率成正比，指数为0.73，即Q(F)*f^&t；0.73&gt；最后，利用这些经验公式作为频域地震动强度评估的标准尺度，提出了一种简单的了解地震动衰减的区域特征的方法。