What question did this study set out to answer?

The study aims to establish a method for accurately estimating ground amplification factors of shear waves by applying a logarithmic smoothing window to the horizontal-to-vertical spectral ratios of fundamental-mode Rayleigh waves and microtremor records.

October 21, 1995Doboku Gakkai RonbunshuOpen Access

A Smoothing Function Suitable for Estimation of Amplification Factor of the Surface Ground From Microtremor and Its Application

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Authors

KKKatsuaki KonnoShibaura Institute of Technology TOTatsuo OhmachiNihon University

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Implication

Geophysical analysis demonstrates that logarithmic smoothing of microtremor spectral ratios accurately estimates ground amplification factors, indicating high utility for seismic hazard mapping.

Key Points

The study aims to establish a method for accurately estimating ground amplification factors of shear waves by applying a logarithmic smoothing window to the horizontal-to-vertical spectral ratios of fundamental-mode Rayleigh waves and microtremor records.
Applied a logarithmic smoothing window to the horizontal and vertical amplitude spectra of fundamental-mode Rayleigh waves to evaluate correlation improvements with SH-wave amplification.
Developed an estimation procedure for surface ground amplification factors from smoothed microtremor horizontal-to-vertical spectral ratios and validated accuracy against actual ground sites with PS logging data.
Constructed a ground amplification factor map across the 23 wards of Tokyo using microtremor measurements recorded at all junior high schools and compared it with existing hazard maps.
Application of the logarithmic smoothing window substantially improved the correlation between the peak horizontal-to-vertical spectral ratio and SH-wave ground amplification factor.
Validation against real ground formations with PS logging data confirmed high estimation accuracy for ground site amplification properties.
The newly generated amplification map for Tokyo's 23 wards demonstrated strong consistency and practical validity when benchmarked against existing geological maps.

Cite This Study

Konno et al. (1995) studied this question.

synapsesocial.com/papers/6a198f983f3ec013f0dec155 https://doi.org/10.2208/jscej.1995.525_247

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Implication

Geophysical analysis demonstrates that logarithmic smoothing of microtremor spectral ratios accurately estimates ground amplification factors, indicating high utility for seismic hazard mapping.

A Smoothing Function Suitable for Estimation of Amplification Factor of the Surface Ground From Microtremor and Its Application

Discussion

Member takes

Implication

Key Points

Cite This Study

A Smoothing Function Suitable for Estimation of Amplification Factor of the Surface Ground From Microtremor and Its Application

Discussion

Member takes

Implication

Key Points

Cite This Study

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