Ambient Noise H / V Spectral Ratio in Site Effect Estimation in La Mesa de Macaracas, Panama

IF 1 Q3 GEOCHEMISTRY & GEOPHYSICS
J. L. De Guevara, A. Mojica, A. Ruiz, C. Ho, Kenia Rodríguez, J. Toral, J. Fábrega
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引用次数: 1

Abstract

In the last 10 years, the community of La Mesa de Macaracas (central Panama) has experienced considerable aftershocks due to earthquakes of magnitudes up to 5.7 Mw. Although most of the community consists of single-storey houses, the agricultural development in the region has led to multistorey building projects. To determine whether the characteristics of the soils could affect future construction in the study area, 16 stations were established to measure ambient vibrations and estimate the predominant frequencies and their corresponding H / V ratio peaks through the ambient noise H / V spectral ratio technique. According to the site class established by the Japan Road Association, the results revealed the existence of (a) soft soil with a range of predominant frequencies between 0.7 and 1.6 Hz, (b) medium soil with a range of predominant frequencies between 2.1 and 2.4 Hz, and (c) hard soil with a range of predominant frequencies between 2.6 and 2.9 Hz. In the first type (soft), the resonance effect could affect constructions of between 6 and 14 storeys with H / V ratio peak values (amplification factor) in the range of 2.1 and 4.3, while in the second and third types (medium and hard soils), buildings of between 3 and 5 storeys could be affected, with H / V ratio peak values (1.5–2.0) except at the SS-9 station. These results were complemented with the V s 30 values obtained in four seismic soundings carried out at the site.
巴拿马La Mesa de Macaracas场地效应估算中的环境噪声H/V谱比
在过去的10年里,La Mesa de Macaracas(巴拿马中部)社区因5.7级地震而经历了相当大的余震 Mw.尽管该社区大部分由单层房屋组成,但该地区的农业发展导致了多层建筑项目。为了确定土壤特性是否会影响研究区域未来的施工,建立了16个测站,通过环境噪声H/V谱比技术测量环境振动并估计主频及其相应的H/V比峰值。根据日本道路协会确定的场地类别,结果表明存在(a)主频范围在0.7至1.6之间的软土 Hz,(b)主频范围在2.1和2.4之间的中等土壤 Hz,以及(c)主频率范围在2.6和2.9之间的硬土 赫兹。在第一种类型(软土)中,共振效应可能影响6至14层的建筑,其H/V比峰值(放大系数)在2.1至4.3之间,而在第二种和第三种类型(中硬土),3至5层的建筑可能受到影响,除SS-9站外,H/V比峰值(1.5–2.0)。这些结果得到了在现场进行的四次地震探测中获得的Vs 30值的补充。
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来源期刊
International Journal of Geophysics
International Journal of Geophysics GEOCHEMISTRY & GEOPHYSICS-
CiteScore
1.50
自引率
0.00%
发文量
12
审稿时长
21 weeks
期刊介绍: International Journal of Geophysics is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles in all areas of theoretical, observational, applied, and computational geophysics.
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