Measurement of interstation phase and group velocities and Q using Wiener filtering
Measurement of interstation phase and group velocities and Q using Wiener filtering
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发表时间：
1982-02
影响因子：
3
通讯作者：
S. R. Taylor;M. Toksöz
中科院分区：
文献类型：
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作者：
S. R. Taylor;M. Toksöz
摘要提出了一种利用维纳(最小二乘)滤波技术计算台间相速度、群速度和衰减系数的方法。台间格林9S(或传递)函数是根据沿同一大圆路径铺设的两个台站的面波数据估计的。该估计是从维纳滤波器获得的，该维纳滤波器被构造为根据在较近的站记录的信号来估计在离震源较远的站处记录的信号。将多重滤波技术应用于Green9S函数，得到了台间群速度，由Green9S函数的相谱得到了台间相速度。利用Green9S函数的幅值谱来计算两个台站之间的平均衰减。利用受噪声污染的合成地震记录，由Green9s函数计算的Q值比用频谱比计算的Q值要稳定和准确得多。该方法对于涉及短站间隔的路径特别有用，并应用于穿越伊朗高原的面波路径。
abstract A method for calculating interstation phase and group velocities and attenuation coefficients using a Wiener (least-squares) filtering technique is presented. The interstation Green9s (or transfer) function is estimated from surface wave data from two stations laying along the same great circle path. The estimate is obtained from a Wiener filter which is constructed to estimate the signal recorded at the station further from the source from the signal recorded at the nearer station. The interstation group velocity is obtained by applying the multiple-filtering technique to the Green9s function, and the interstation phase velocity from the phase spectrum of the Green9s function. The amplitude spectrum of the Green9s function is used to calculate average attenuation between the two stations. Using synthetic seismograms contaminated by noise, it is shown that the Q values calculated from the Green9s function are significantly more stable and accurate than those obtained by taking spectral ratios. The method is particularly useful for paths involving short station separations and is applied to a surface wave path crossing the Iranian Plateau.