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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Estimation of geometrical spreading, quality factor and kappa in the zagros region
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Estimation of geometrical spreading, quality factor and kappa in the zagros region

机译：估算扎格罗斯地区的几何分布，品质因数和kappa

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We have investigated the attenuation characteristics of the S-wave of 129 earthquakes recorded by 180 accelerometers in the Zagros region of Iran. A total number of 1641 Fourier amplitude spectra were used for a step by step estimation of the high-frequency attenuation, geometrical spreading parameters and the frequency dependence of S-wave quality factor. Two different criteria for isolating the S-wave window were examined in order to assess the effect of window selection on the estimated parameters. For the horizontal and vertical zero-distance, kappa values of 0.043 and 0.033 were obtained, respectively. The S-wave window selection method does not affect the estimated kappa values. We used Bayesian approach to estimate the tri-linear geometrical spreading parameters. The hinge positions of the tri-linear model (63 +/- 5 and 124 +/- 18 km) and the geometrical spreading coefficient (-0.8) for distances smaller than 63 km were found to be independent of frequency and window type. Both spreading coefficients for distances beyond the first hinge are highly frequency dependent, while at distances beyond 124 km, the coefficients at all frequencies are sensitive to the window type. The frequency-independent spreading coefficients were estimated by simultaneous inversion of all frequencies, and the absolute value of the coefficients at longer distances were found to be larger for longer S-wave windows. The average of the coefficients over both windows for the second and third hinges are -0.17 and -0.55, respectively. The S-wave quality factor is influenced by window type only at frequencies larger than 5 Hz. The frequency dependence of the quality factor at lower frequencies was determined as 141f(0.84).
机译：我们调查了180个加速度计在伊朗Zagros地区记录的129次地震S波的衰减特性。总共使用了1641个傅立叶振幅谱，逐步估计高频衰减，几何扩展参数和S波品质因数的频率依赖性。为了评估窗选择对估计参数的影响，检查了两种不同的隔离S波窗的标准。对于水平和垂直零距离，kappa值分别为0.043和0.033。 S波窗口选择方法不会影响估计的kappa值。我们使用贝叶斯方法来估计三线性几何扩展参数。对于小于63 km的距离，三线性模型（63 +/- 5和124 +/- 18 km）的铰链位置和几何扩展系数（-0.8）与频率和窗口类型无关。超过第一铰链的距离的两个扩展系数都高度依赖于频率，而超过124 km的距离，所有频率的系数都对窗口类型敏感。通过同时反转所有频率来估计与频率无关的扩展系数，并且对于较长的S波窗，在较长距离处的系数绝对值较大。第二和第三铰链在两个窗口上的系数平均值分别为-0.17和-0.55。窗口类型仅在大于5 Hz的频率下影响S波品质因数。品质因数在较低频率下的频率依赖性确定为141f（0.84）。

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