1 Seismic Characterization of Geotechnical Sites By Multichannel Analysis of Surface Waves ( MASW ) Method
1 Seismic Characterization of Geotechnical Sites By Multichannel Analysis of Surface Waves ( MASW ) Method
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发表时间：
2002
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通讯作者：
Choon B. Park;Richard D. Miller;J. Xia;Julian Ivanov
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作者：
Choon B. Park;Richard D. Miller;J. Xia;Julian Ivanov
场地剪切波速信息是土动力学和地震工程中的重要参数之一。虽然它可以从剪切波地震勘探中获得，无论是在地面上还是通过钻孔方法，面波方法是一个很好的选择。它利用瑞利波的频散，通常需要超过三分之二的总地震能量产生的冲击震源在表面。这表明在实地调查中相对容易，有时在采集后处理步骤中也相对容易。虽然由于这个原因，该方法显得非常有吸引力，但是，与所有其他类型的地震方法一样，可能会出现复杂性。源产生的体波（例如，直接和折射压缩波），瑞利波的较高模式，随机环境噪声（例如，文化噪声），以及从表面对象散射的相干到达（例如，从建筑物地基）都干扰信号，平面基模瑞利波直接从源传播。与石油工业长期使用的方法类似的多道地震方法在采集和处理阶段提供了非常有效的质量控制。此外，2-D模式识别处理技术即使在严重的噪声污染下也具有区分信号和噪声的非凡能力。这种地震方法适用于各种土壤现场项目，以产生1-D和2-D Vs图。纵波速度（Vp）是通过不同的处理步骤从用于Vs分析的相同数据集获得的有价值的副产品之一。
Shear wave velocity (Vs) information of a soil site is one of the critical parameters in soil dynamics and earthquake engineering. Although it can be obtained from a shear-wave seismic survey either at the surface or through a borehole method, the surface-wave method is an excellent alternative. It utilizes the dispersion of Rayleigh waves that usually take more than two thirds of total seismic energy generated by an impact seismic source at the surface. This indicates a relative easiness in the field survey and sometimes also during the post-acquisition processing steps. Although because of this reason the method appears highly attractive, complications, however, may arise as with all other types of seismic method. Source-generated body waves (e.g., direct and refracted compressional waves), higher modes of Rayleigh waves, random ambient noise (e.g., cultural noise), and coherent arrivals scattered from surface objects (e.g., from building foundations) all interfere with the signal, the planar fundamental-mode Rayleigh waves propagating directly from source. A multichannel seismic method similar to the one long used in the oil industry provides a highly effective quality control during both acquisition and processing stages. In addition, a 2-D pattern-recognition processing technique has an extraordinary capability to differentiate signal from noise even under a severe noise contamination. This seismic method is applied to various soil-site projects to produce 1-D and 2-D Vs maps. Compressional wave velocity (Vp) is one of the valuable by-products obtainable from the same data set used for Vs analysis through a different processing step.