Field Investigation of Love Waves In Near-surface Seismology
Field Investigation of Love Waves In Near-surface Seismology
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DOI：
10.1190/1.2901215
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发表时间：
2008-05
期刊：
影响因子：
--
通讯作者：
R. Eslick;G. Tsoflias;D. Steeples
中科院分区：
文献类型：
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作者：
R. Eslick;G. Tsoflias;D. Steeples
我们研究了在近地表调查中成功利用Love波的地下条件和测量参数。洛夫波的产生需要低剪切速度面层的存在。我们研究了在5-50 Hz频率范围内产生和记录可用Love-wave数据集所需的近地表最小厚度。我们在一个山坡上获得了现场数据，那里有平坦的石灰岩和页岩层，可以直接测试不同的覆盖层厚度和不同的采集几何形状。分析了得到的地震记录和频散图像，并对两层的Love-wave频散关系进行了分析检验。通过理论和现场数据分析，我们得出结论，在近地表Love-wave调查中，要在感兴趣的频率范围内记录可用数据，低速材料的厚度至少需要1米。本研究结果表明，现有的瑞利波数据采集准则，如接收间隔和线路长度，同样适用于Love-wave数据采集。
We examine subsurface conditions and survey parameters suitable for successful exploitation of Love waves in nearsurface investigations. Love-wave generation requires the existence of a low shear-velocity surface layer. We examined the minimum thickness of the near-surface layer necessary to generate and record usable Love-wave data sets in the frequency range of 5–50 Hz. We acquired field data on a hillside with flat-lying limestone and shale layers that allowed for the direct testing of varying overburden thicknesses as well as varying acquisition geometry. The resulting seismic records and dispersion images were analyzed, and the Love-wave dispersion relation for two layers was examined analytically. We concluded through theoretical and field data analysis that a minimum thickness of 1 m of low-velocity material is needed to record usable data in the frequency range of interest in near-surface Love-wave surveys. The results of this study indicate that existing guidelines for Rayleigh-wave data acquisition, such as receiver interval and line length, are also applicable to Love-wave data acquisition.