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Estimation of earthquake parameters in the Alborz seismic zone, Iran using generalized inversion method

机译：用广义反演方法估算伊朗阿尔伯兹地震带的地震参数

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Generalized inversion of the S-wave amplitude spectra from the strong-motion network data in the Alborz, Iran has been used to estimate simultaneously source parameters, site response and S-wave attenuation (Qs). To obtain an optimum inverse solution, and also for decreasing the uncertainty level, a frequency-dependent site amplification as a constraint, was imposed to five reference site responses. This constraint removes the undetermined degree of freedom in the inversion. Furthermore, for removing the trade-off between geometrical spreading and anelastic attenuation, a geometrical spreading factor was adopted from the Motazedian [20] study. A point source model has been calibrated against the resulting source terms and consequently source parameters, like corner frequency, moment magnitude and high frequency fall off coefficient, for each event has been determined separately. Also, based on the available data and their connectivity two sub-regions including western and eastern parts of Alborz located east and west of 52.5°E have been considered to see that if there is any possible systematic difference in their seismic source characteristics. The average stress drops obtained are about 182 and 116 bars, respectively for eastern and western Alborz. Another result of the study is the site responses, which have been determined for all of 81 stations individually. Though soil nonlinearity was detected at the Ab-bar station (experienced strong ground shaking, i.e., PGA > 0.5 g) near to the epicenter of Manjil M7.4 earthquake of June 20, 1990, but an analysis of residuals showed generally a weak influence of soil nonlinearity (i.e., dependence of amplification on shaking level); probably because of the relatively weak levels of acceleration in our database. Finally, the shear wave quality factor (i.e., Qs) has been determined as a function of frequency represented by a linear equation in logarithmic scale. To evaluate the outcomes of the current study, the results have been compared with similar studies wherever it was available. The results of the current study are of utmost importance for seismic hazard assessment of the metropolitan area of Tehran, where 15 million people live, one-fifth of the population of Iran.
机译：来自伊朗阿尔伯兹的强运动网络数据的S波振幅谱的广义反演已用于同时估算震源参数，场地响应和S波衰减（Qs）。为了获得最佳的逆解，同时也为了降低不确定度，对五个参考位点响应施加了频率相关位点放大作为约束。该约束消除了反演中不确定的自由度。此外，为了消除几何扩展和非弹性衰减之间的权衡，从Motazedian [20]研究中采用了几何扩展因子。已针对所得的源项对点源模型进行了校准，因此，已分别确定了每个事件的源参数，例如转角频率，力矩幅度和高频衰减系数。此外，根据现有数据及其连通性，考虑了位于52.5°E以东和以西的两个子区域，包括Alborz的西部和东部，以查看其震源特征是否存在任何系统性差异。东部和西部的奥尔伯兹获得的平均应力降分别约为182和116巴。该研究的另一个结果是现场响应，已针对81个站点分别进行了确定。尽管在1990年6月20日发生的Manjil M7.4地震震中附近的Ab-bar站（经历了强烈的地面震动，即PGA> 0.5 g）处检测到土壤非线性，但是对残余物的分析通常显示出较弱的影响土壤的非线性（即，放大率对振动水平的依赖性）；可能是因为我们数据库中的加速水平相对较弱。最后，已确定剪切波品质因数（即，Qs）作为对数标度中由线性方程表示的频率的函数。为了评估当前研究的结果，将结果与任何可用的相似研究进行了比较。目前的研究结果对于德黑兰市区的地震危害评估至关重要，该地区有1500万人居住，占伊朗人口的五分之一。

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    《Soil Dynamics and Earthquake Engineering》 |2012年第2012期|p.197-218|共22页
  • 作者

    H. Zafarani; B. Hassani; A. Ansari;

  • 作者单位

    International Institute of Earthquake Engineering and Seismology (IIEES) No. 26. Arghavan St. North Dibajee Farmanieh PO Box 19395/3913 Tehran Iran;

    Department of Civil Engineering University of Tehran Tehran P.O. Box 11365-4563. Iran;

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