Shear Wave Velocity Estimates through Combined Use of Passive Techniques in a Tectonically Active Area

IF 2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
R. Biswas, S. Baruah
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引用次数: 9

Abstract

We made an attempt to assess the shear wave velocity values VS and, to a lesser extent, the VP values from ambient noise recordings in an array configuration. Five array sites were situated in the close proximity to borehole sites. Shear wave velocity profiles were modeled at these five array sites with the aid of two computational techniques, viz. spatial autocorrelation (SPAC) and H/V ellipticity. Out of these five array sites, velocity estimates could be reliably inferred at three locations. The shear wave velocities estimated by these methods are found to be quite consistent with each other. The computed VS values up to 30 m depth are in the range from 275 to 375 m/s in most of the sites, which implies prevalence of a low velocity zone at some pocket areas. The results were corroborated by evidence of site geology as well as geotechnical information.
在构造活动区联合使用被动技术估算横波速度
我们尝试评估横波速度值VS,在较小程度上,从阵列配置的环境噪声记录中评估VP值。五个阵列点位于靠近钻孔点的位置。利用空间自相关(SPAC)和H/V椭圆度两种计算技术,对这5个阵列点的横波速度分布进行了建模。在这五个阵列站点中,可以可靠地推断出三个位置的速度估计。用这些方法计算出的横波速度是相当一致的。在大多数地点,30 m深度的计算VS值在275 ~ 375 m/s之间,这意味着在一些口袋区域存在低速带。这些结果得到了现场地质证据和岩土工程信息的证实。
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来源期刊
Acta Geophysica
Acta Geophysica 地学-地球化学与地球物理
CiteScore
3.90
自引率
13.00%
发文量
251
审稿时长
5.3 months
期刊介绍: Acta Geophysica is open to all kinds of manuscripts including research and review articles, short communications, comments to published papers, letters to the Editor as well as book reviews. Some of the issues are fully devoted to particular topics; we do encourage proposals for such topical issues. We accept submissions from scientists world-wide, offering high scientific and editorial standard and comprehensive treatment of the discussed topics.
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