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首页> 外文期刊>Journal of geophysics and engineering >Analysis of Iranian strong-motion data using the specific barrier model
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Analysis of Iranian strong-motion data using the specific barrier model

机译：使用特定障碍模型分析伊朗强运动数据

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Two decades after the development of the specific barrier model (SBM) by Papageorgiou and Aki (1983a Bull. Seism. Soc. Am. 73 693-722, 1983b Bull. Seism. Soc. Am. 73 953-78), it remains to be the most sophisticated, yet simple, theoretical description of the earthquake faulting process. In this study, strong-motion accelerograms recorded in Iran are used in the context of 'random vibration theory' to calibrate the SBM. The database consists of 136 three-component records from 19 earthquakes of magnitude ranging from Mw 5.2 to Mw 7.4, recorded at hypocentral distances up to 200 km. Regression analysis has been conducted for pseudospectral velocity (PSV) using the 'random-effects' model that accounts for correlations in the data recorded by a single earthquake. A rough estimation of site amplification functions, is first obtained by the incorporation of mean frequency-dependent site-amplification factors, based on a gross characterization of the site class. However, a repetition of regression analysis with the use of a site-specific amplification function estimated by the horizontal-to-vertical ratio technique improved the fit to the observed amplitudes over the lower frequencies. The average values of the local and global stress drops, which are the two key parameters of the SBM, are determined to be 90 and 44 bars, respectively. The predicted PSV values agree well with available Iranian strong-motion data, as evidenced by the near-zero average of differences between the logarithms of the observed and predicted values (residuals) for all frequencies and the lack of any significant residual trends with distance and magnitude. A comparison of the SBM source spectra of this study with those of California and eastern North America (ENA) reveals that the spectral amplitudes are more like typical Californian source models than ENA in the frequency range studied here, from 1 to 10 Hz. Moreover, the calibrated model of this study which provides an efficient and physical representation of Iranian plateau source characteristics is found to be in reasonably good agreement with other local and regional attenuation relationships. Investigation of the residuals showed only a weak influence of soil nonlinearity; however, because of the relatively weak levels of acceleration in our database, it is not yet adequate to clearly distinguish this effect.
机译：在Papageorgiou和Aki（1983a Bull。Seism。Soc。Am。73 693-722，1983b Bull。Seism。Soc。Am。73 953-78）开发特定屏障模型（SBM）的二十年后，它仍然存在是地震断层过程的最复杂，最简单的理论描述。在这项研究中，在“随机振动理论”的背景下，使用了伊朗记录的强运动加速度图来校准SBM。该数据库由19次地震（从Mw 5.2到Mw 7.4）的136条三分量记录组成，记录的震中距离最大为200 km。使用“随机效应”模型对伪谱速度（PSV）进行了回归分析，该模型考虑了一次地震记录的数据中的相关性。首先根据站点类别的总体特征，通过结合平均频率相关的站点放大因子来获得站点放大功能的粗略估计。但是，通过使用水平与垂直比率技术估计的特定于站点的放大函数来重复进行回归分析，可以改善对较低频率上观察到的振幅的拟合度。作为SBM的两个关键参数的局部和全局应力降的平均值分别确定为90 bar和44 bar。 PSV的预测值与可用的伊朗强运动数据非常吻合，所有频率的观测值和预测值（残差）的对数之间的差值几乎为零，并且距离和距离均不存在任何明显的残留趋势，这证明了这一点大小。将本研究的SBM源谱与加利福尼亚州和北美东部（ENA）的SBM源谱进行比较后，发现在此处研究的1至10 Hz的频率范围内，谱幅更像是典型的加利福尼亚源模型，而不是ENA。此外，发现该研究的校准模型提供了伊朗高原源特征的有效和物理表示，与其他局部和区域衰减关系相当吻合。对残差的研究仅显示了土壤非线性的微弱影响。但是，由于我们数据库中的加速水平相对较弱，因此尚不足以清楚地区分这种影响。

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