Seismic wave attenuation in volcanic rocks from VSP experiments
Seismic wave attenuation in volcanic rocks from VSP experiments
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VSP 实验中火山岩中的地震波衰减
DOI：
10.1190/1.1443164
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发表时间：
1991
期刊：
影响因子：
3.3
通讯作者：
S. Smithson
中科院分区：
文献类型：
--
作者：
J. Pujol;S. Smithson
利用垂直地震剖面（VSP）资料分析了哥伦比亚高原玄武岩和斯内克河平原火山岩中地震波的衰减。衰减系数的计算基于将直线拟合到针对固定频率值和可变深度计算的振幅比的对数。这种方法不需要对Q对频率的依赖性进行任何假设。对于哥伦比亚高原玄武岩，从现场数据得到的衰减系数小于那些从合成VSP使用声波和密度测井产生的计算，表明所观察到的衰减与散射效应，并大大大于玄武岩的固有衰减。因此，它的结论是，只有一个下限Q可以建立，与最近的研究结果由其他作者。玄武岩对地震能量的有效衰减（峰值频率约为1.1×10-4dbs/m）与玄武岩对地震能量的有效衰减（峰值频率约为1.1×10-4dbs/m）相当。
Seismic wave attenuation in the Columbia Plateau basalts and Snake River Plain volcanics was analyzed using vertical seismic profiling (VSP) data. The computation of attenuation coefficients is based on fitting a straight line to the logarithm of amplitude ratios computed for fixed values of frequency and variable depth. This approach does not require any assumptions on the dependence of Q on frequency. For the Columbia Plateau basalts, the attenuation coefficients obtained from the field data are smaller than those computed from the synthetic VSP generated using the sonic and density logs, indicating that the observed attenuation is related to scattering effects and is substantially larger than the intrinsic attenuation of basalt. Therefore, it is concluded that only a lower bound for Q can be established, in agreement with recent findings by other authors. The effective attenuation of seismic energy in basalts (about 1.1×10-4dbs/m for the peak frequency) is comparable to the effective attenuation observ...
影响因子：
20.6
作者：
HARRIS, FJ
通讯作者：
HARRIS, FJ