Soil damping and site dominant vibration period determination, by means of random decrement method and its relationship with the site-specific spectral decay parameter kappa

Fernández-Heredia, Avelina I.; Huerta-Lopez, C. I.; Castro-Escamilla, Raúl R.; Romo, J. M.

doi:10.1016/j.soildyn.2012.07.031

Cited by 9 publications

(2 citation statements)

References 9 publications

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“…Notwithstanding, it has proved a reasonable approximation for several datasets (Nava et al, 1999;Douglas et al, 2010;Gentili and Francheschina, 2011;Ktenidou et al, 2013). Other studies find distance dependencies that deviate in different ways from the initial linear assumption Anderson, 1991;Humphrey and Anderson, 1992;Castro et al, 1996;Fernández-Heredia et al, 2012). Some studies have even found negligible distance dependence in some regions out to 80 km (Tsai and Chen, 2000;Purvance and Anderson, 2003).…”

Section: κ: a Multitude Of Applications Physical Interpretations Anmentioning

confidence: 93%

Taxonomy of : A Review of Definitions and Estimation Approaches Targeted to Applications

Ktenidou

Cotton

Abrahamson

et al. 2014

Seismological Research Letters

155

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Section: κ: a Multitude Of Applications Physical Interpretations Anmentioning

confidence: 93%

Taxonomy of : A Review of Definitions and Estimation Approaches Targeted to Applications

Ktenidou

Cotton

Abrahamson

et al. 2014

Seismological Research Letters

155

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“…The relation between κ 0 and ξ for the top layers has not been fully investigated. Fernández-Heredia et al (2012) suggested a loose correlation between ξ and κ 0 . A successful separation of the reference rock and overlying geology would help avoid any double counting of attenuation in the subsequent response analysis.…”

Section: Correlation With the Deeper Basin Structurementioning

confidence: 99%

Understanding the physics of kappa (κ): insights from a downhole array

et al. 2015

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S U M M A R YAt high frequencies, the acceleration spectral amplitude decreases rapidly; this has been modelled with the spectral decay factor κ. Its site component, κ 0 , is used widely today in ground motion prediction and simulation, and numerous approaches have been proposed to compute it. In this study, we estimate κ for the EUROSEISTEST valley, a geologically complex and seismically active region with a permanent strong motion array consisting of 14 surface and 6 downhole stations. Site conditions range from soft sediments to hard rock. First, we use the classical approach to separate local and regional attenuation and measure κ 0 . Second, we take advantage of the existing knowledge of the geological profile and material properties to examine the correlation of κ 0 with different site characterization parameters. κ 0 correlates well with V s30 , as expected, indicating a strong effect from the geological structure in the upper 30 m. But it correlates equally well with the resonant frequency and depth-to-bedrock of the stations, which indicates strong effects from the entire sedimentary column, down to 400 m. Third, we use our results to improve our physical understanding of κ 0 . We propose a conceptual model of κ 0 with V s , comprising two new notions. On the one hand, and contrary to existing correlations, we observe that κ 0 stabilizes for high V s values. This may indicate the existence of regional values for hard rock κ 0 . If so, we propose that borehole measurements (almost never used up to now for κ 0 ) may be useful in determining these values. On the other hand, we find that material damping, as expressed through travel times, may not suffice to account for the total κ 0 measured at the surface. We propose that, apart from material damping, additional site attenuation may be caused by scattering from small-scale variability in the profile. If this is so, then geotechnical damping measurements may not suffice to infer the overall crustal attenuation under a site; but starting with a regional value (possibly from a borehole) and adding damping, we might define a lower bound for site-specific κ 0 . More precise estimates would necessitate seismological site instrumentation.

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Spectral Decay Parameter (k) of Western Iran Using Accelerograms Recorded up to 2018

Alibazi

Saffari

2019

Pure Appl. Geophys.

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Soil damping and site dominant vibration period determination, by means of random decrement method and its relationship with the site-specific spectral decay parameter kappa

Cited by 9 publications

References 9 publications

Taxonomy of : A Review of Definitions and Estimation Approaches Targeted to Applications

Taxonomy of : A Review of Definitions and Estimation Approaches Targeted to Applications

Understanding the physics of kappa (κ): insights from a downhole array

Spectral Decay Parameter (k) of Western Iran Using Accelerograms Recorded up to 2018

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