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Shear-wave velocity measurements and their uncertainties at six industrial sites
Earthquake Spectra ( IF 3.1 ) Pub Date : 2021-03-03 , DOI: 10.1177/8755293020988029
Yaniv Darvasi 1
Affiliation  

This study assesses the variability of shear-wave (VS) profile determinations for a suite of methods at six industrial sites. The methods include active, consisting of multi-channel analysis of surface waves (MASW), as well as passive, consisting of refraction microtremor (ReMi), and extended spatial autocorrelation (ESAC). The purpose is to ascertain the effect of the higher level of ambient noise on the results from the different methods, as only a few of these many methods are commonly used for site characterization. The measured dispersion curves are in fair agreement with one another. The average coefficient of variation (CoV; the percentage ratio of the standard deviation to the mean) for the dispersion curves varied from 2.5% to 12.6%. In contrast, over the VS-depth domain, the average shear-wave velocity profiles to a depth z (VS,Z) vary from 11.6% to 16.5% between the various methods at the different sites. This indicates that the variance among the individual methods can lead to significant misinterpretation of the shallow subsurface, while the average VS,Z is much more robust. This reaffirms its use (mainly as VS,30) in building codes and within ground motion prediction equations (GMPEs). At all six sites, because of inversion processes, the variability within each method ranges from 4% up to 14%. There is no correlation between the test type and the CoV. Our study focused on surface-wave measurements in noisy industrial environments, where the signals processed are typically complex. Despite this complexity, our results suggest that such tests are also applicable to industrial zones, where the noisy environment constitutes an energy source.



中文翻译:

六个工业现场的剪切波速度测量及其不确定性

本研究评估横波(的变化V小号)简档确定为一套六个工业场所的方法。这些方法包括主动的(包括多通道表面波分析(MASW))以及被动的(包括折射微震(ReMi)和扩展空间自相关(ESAC))。目的是确定较高水平的环境噪声对不同方法的结果的影响,因为许多方法中只有少数方法通常用于位置表征。测得的色散曲线彼此公平一致。色散曲线的平均变异系数(CoV;标准偏差与平均值的百分比比)从2.5%到12.6%不等。相反,在V S上在深度域中,不同位置之间的各种方法之间,平均剪切波速度剖面到深度zV S,Z)的范围从11.6%到16.5%。这表明,各个方法之间的差异可能导致对浅层地下物体的严重误解,而平均V S,Z则更为稳健。这重申了它的用法(主要是V S,30),建筑规范中以及地震动预测方程式(GMPE)中。在所有六个位置,由于反演过程,每种方法内的变异性范围从4%到14%。测试类型和CoV之间没有相关性。我们的研究重点是在嘈杂的工业环境中进行表面波测量,在这些环境中,处理的信号通常很复杂。尽管存在这种复杂性,我们的结果表明,此类测试也适用于嘈杂的环境构成能源的工业区。

更新日期:2021-03-03
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