Ground Transfer Functions of Seismic Waves Propagating between Vertical Array Measurement Points

Ikeura, Tomonori

doi:10.5610/jaee.9.1_65

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…In calculation of the transfer function of the observed records, the influence of noise should be treated carefully. An useful method that excludes the influence of noise using an ensemble average has been proposed, 6 but this method is difficult to apply to an individual event, especially when response enters the nonlinear range. Therefore, to focus on the evaluation of nonlinear responses, conventional Fourier amplitude ratios are used as the transfer functions.…”

Section: Analyses Of the Observed Strong Motionsmentioning

confidence: 99%

Reduction effect of building structure response by dynamic soil‐structure interaction evaluated from observed strong motion

Okano

Azuhata

Inoue

et al. 2018

Japan Architectural Review

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Section: Analyses Of the Observed Strong Motionsmentioning

confidence: 99%

Reduction effect of building structure response by dynamic soil‐structure interaction evaluated from observed strong motion

Okano

Azuhata

Inoue

et al. 2018

Japan Architectural Review

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Consideration on frequency dependences of near-surface attenuation of S-waves based on vertical array records

Kobayashi¹,

Mamada²,

Tsutsumi³

2011

Journal of JAEE

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Frequency dependences of near-surface attenuation of S-waves based on the vertical array records were examined to clarify their physical mechanisms using the data collected at the KiK-net Narita observatory site. The attenuation was estimated as a function of frequency by matching the SH-wave transfer function to the observed spectral ratio using the subsurface velocity structure derived from the PS logging profile. In addition to these examinations, numerical experiments with synthetic pseudo spectral ratio, which was calculated by use of the subsurface model constructed from the velocity and attenuation structure estimated at the Narita observatory, were performed to make clear the cause of frequency dependences of S-wave attenuation from an analytical point of view. The estimated S-wave attenuation of the sedimentary layer-basement system at the Narita observatory has a constant value of about 0.004 -0.005 (h=0.4 -0.5%) with its lower limit at frequencies higher than 4 -5Hz. On the other hand, the attenuation strongly increases with decreasing frequency below around 2 -3Hz. It is quite likely that selection of the time window for picking out the S-waves portion may lead to artificial frequency dependence of attenuation at these lower frequency ranges. The attenuation value and its frequency dependence tend to decrease as the length of time window increases. In other words, the S-wave attenuation evaluated from the vertical array records seems to have some artificial frequency dependences, especially at lower frequencies. It is therefore important to carefully check errors in estimating attenuation.

show abstract

Ground Transfer Functions of Seismic Waves Propagating between Vertical Array Measurement Points

Cited by 2 publications

References 11 publications

Reduction effect of building structure response by dynamic soil‐structure interaction evaluated from observed strong motion

Reduction effect of building structure response by dynamic soil‐structure interaction evaluated from observed strong motion

Consideration on frequency dependences of near-surface attenuation of S-waves based on vertical array records

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