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Frequency-dependent attenuation of S-waves in the Kanto region, Japan

机译：日本关东地区S波随频率的衰减

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摘要

Apparent, scattering, and intrinsic S-wave attenuations (Q(S)(-1), Q(scat)(-1), and Q(int)(-1)) of the upper lithosphere in the Kanto region of Japan were measured in the 1- to 32-Hz frequency range using Multiple Lapse Time Window Analysis (MLTWA) for 115 borehole seismograms of local earthquakes. A new set of time windows for MLTWA, in which multiple isotropic scattering is assumed, was proposed and employed to estimate the frequency dependence of S-wave attenuation parameters. Scattering attenuation was found to dominate intrinsic attenuation in the S-wave attenuation mechanism at low frequencies (<2 Hz), whereas the opposite relation was observed at high frequencies. The transition is caused by the different frequency dependences of Q(scat)(-1) (alpha f(-1.5)) and Q(int)(-1)(alpha f(-0.7)) at this frequency. Interestingly, Q(scat)(-1), is almost frequency independent at frequencies >8 Hz, which implies the self-similar nature of short-wavelength heterogeneities in the upper lithosphere. In terms of the upper lithosphere of the Kanto region, these results may indicate that the random heterogeneities characterized by ;the Gaussian autocorrelation function with a fractional fluctuation epsilon approximate to 10% and a correlation length a approximate to 2 km are superimposed on the weak background self-similar heterogeneity.
机译：日本关东地区上岩石圈的表观，散射和固有S波衰减（Q（S）（-1），Q（scat）（-1）和Q（int）（-1））为使用多重间隔时间窗分析（MLTWA）在1至32 Hz频率范围内对115个局部地震的井眼地震图进行测量。提出了一套新的MLTWA时间窗，其中假设了多个各向同性散射，并用来估计S波衰减参数的频率依赖性。发现在低频（<2 Hz）下，S波衰减机制中的固有衰减主要是散射衰减，而在高频下则观察到相反的关系。该过渡是由该频率下Q（scat）（-1）（αf（-1.5））和Q（int）（-1）（αf（-0.7））的不同频率依赖性引起的。有趣的是，Q（scat）（-1）在> 8 Hz的频率下几乎与频率无关，这暗示着上岩石圈中短波非均质性的自相似性。就关东地区的上岩石圈而言，这些结果可能表明，特征为;具有约10％的分数波动ε和约2 km的相关长度的高斯自相关函数表征的随机异质性叠加在弱背景上自相似异质性。

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