Improved site-dependent statistical relationships of VS and resonant frequency versus bedrock depth in Japan

Thabet, Mostafa

doi:10.1007/s10950-021-10038-9

Cited by 7 publications

(2 citation statements)

References 37 publications

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“…Lu et al 5 concluded that the seismic wave modification is primarily influenced by the interface with the highest IC in the near‐surface layers. Thabet 6,7 identified the deep and shallow bedrock peaks in the HVSR curve, corresponding to the bedrock interfaces with the highest and second highest ICs, respectively. They also found that the site resonance frequency depends on the average S‐wave velocity structure of the layers on the bedrock half‐space, rather than the S‐wave shear wave velocity of the bedrock layers.…”

Section: Introductionmentioning

confidence: 99%

Relationship between site resonance frequency and bedrock interface at one‐dimensional sites based on the KiK‐net database

Kong,

Rong,

et al. 2024

Earthquake Engineering and Resilience

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Site resonance frequency is a crucial parameter for estimating site effects. However, there is currently no consensus on how to identify the bedrock interface to obtain the site resonance frequency. In this study, we identified 43 stations that can be regarded as one‐dimensional sites from the KiK‐net network in Japan, which consists of 699 stations. By analyzing the horizontal‐to‐vertical spectral ratio and surface‐to‐borehole spectral ratio of strong motion observation recordings, the fundamental resonance frequency (f0) of these 43 sites was determined. Subsequently, the correlation between the f0 values obtained from theoretical noise horizontal‐to‐vertical spectral ratio (NHV) with different bedrock interfaces and the f0 values determined from observation was analyzed. The conclusion shows that the f0 is primarily influenced by shallow interfaces with high S‐wave impedance contrasts (ICs). Specifically, when the bedrock interface is taken as the interface with ICs greater than 2.5 that appears for the first time, or the interface with ICs greater than 1.5 that appears for the second time, there is a strong correlation (greater than 0.86) between the f0 values obtained from theoretical NHV and from observation. These findings can provide a quantitative reference for accurately determining the fundamental resonance frequency.

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Section: Introductionmentioning

confidence: 99%

Relationship between site resonance frequency and bedrock interface at one‐dimensional sites based on the KiK‐net database

Kong,

Rong,

et al. 2024

Earthquake Engineering and Resilience

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“…Seekins et al 1996;Thabet 2019 and2021b). The applicability of horizontal-to-vertical spectral ratio (HVSR) is tested byRigano et al (2008) concluding good results on the surface of faults.…”

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confidence: 99%

Observed Evidences of Frequency-Dependent Site Amplification Due to Structural Control of Active Reverse Faults at Different Localities in Japan

Thabet¹

2021

Preprint

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Observed active fault zone related site amplification is calculated based on Fourier acceleration spectrum (FAS) at three different localities in Japan. The FASs are calculated using 26432 earthquakes recorded at 126 K-NET and KiK-net seismic stations, which are distributed on the fault zones, upthrown and downthrown sides. This observed amplification is strongly frequency-dependent because of the presence of the near-surface low-velocity flower fault structure and the deeper fault zone. Moreover, the amplification patterns at each study area are tectonic-specific patterns. Sources inside the active fault zones could produce amplification at high frequencies at stations on both fault zone and far away from the fault zone, because of the impact of the near-surface fault zone. Sources outside the active fault zones yield remarkable high amplification at low frequencies exhibiting a gradual increase through stations on hanging walls, fault zones, and footwalls. Interestingly, the peaks of the low-frequency amplification are corresponding to wavelengths that approximately equalize the width of the fault zone. The presence of fault zone low-velocity layers could be successfully detected by the diffuse field theory inversion.

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Seismic site characterization considering directional near-field seismogenic active faults in Aswan area, Egypt

Thabet

Omar²,

Mohamed³

et al. 2023

Acta Geophys.

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Improved site-dependent statistical relationships of VS and resonant frequency versus bedrock depth in Japan

Cited by 7 publications

References 37 publications

Relationship between site resonance frequency and bedrock interface at one‐dimensional sites based on the KiK‐net database

Relationship between site resonance frequency and bedrock interface at one‐dimensional sites based on the KiK‐net database

Observed Evidences of Frequency-Dependent Site Amplification Due to Structural Control of Active Reverse Faults at Different Localities in Japan

Seismic site characterization considering directional near-field seismogenic active faults in Aswan area, Egypt

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