Attenuation of surface waves in a granular material
Attenuation of surface waves in a granular material
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颗粒材料中表面波的衰减
DOI：
10.1029/jz068i023p06317
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发表时间：
1963
期刊：
影响因子：
--
通讯作者：
L. D. Porter
中科院分区：
文献类型：
--
作者：
L. Knopoff;L. D. Porter
在实验室中测量了瑞利波在西风花岗岩中的衰减。对于在50 kc/s和大约400 kc/s之间的频率，比衰减因子Q基本上与频率无关。在这个频率范围内，QR = 79.0 ± 1.6;这个值非常接近于在长许多数量级的周期内激发的地球物质所获得的值。对于400 kc/s以上的频率，衰减因子中有一个额外的分量，其变化近似为频率的四次方;这表明颗粒结构的瑞利散射是该频率范围内地震衰减的主要机制。
The attenuation of Rayleigh waves in Westerly granite has been measured in the laboratory. For frequencies between 50 kc/s and about 400 kc/s the specific attenuation factor Q is substantially frequency independent. In this frequency range QR = 79.0 ± 1.6; this value is remarkably close to values obtained for earth materials excited at periods which are many orders of magnitude longer. For frequencies above 400 kc/s there is an additional component in the attenuation factor which varies approximately as the fourth power of the frequency; this suggests that Rayleigh scattering by the granular structure is the dominant mechanism for seismic attenuation in this frequency range.