Ground Vibration Characteristics Induced at High-Speed by Shinkansen and Evaluation Method for Speed Dependency

Yokoyama, Hidehumi; Ashiya, Kimitoshi; Iwata, Naoyasu

doi:10.2219/rtriqr.47.156

Cited by 7 publications

(8 citation statements)

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“…These profiles could be obtained from boreholes, geological and geophysical data. Due to there are no detailed shear wave velocity profiles in this region, herein, in the current study, the local site amplification factors of the five selected stations are approximately estimated by the H/V spectral ratio given by Nakamura (1989), then the local site effect is obtained from the resulted H/V curves (Meneisy et al., 2020; Toni, 2017), which is plotted in Figure 6. The figure indicates that the H/V curves at stations 053BCJ, 053YBX, 053DLY, and 053YPX shows multiple peak characteristics, this may be due to the existence of multiple impedance interfaces under the surface where these stations are located or the resonance of S‐wave (Lu & Wang, 2018).…”

Section: Resultsmentioning

confidence: 99%

Simulation of Ground Motion From Finite‐Fault Modeling Incorporating the Influence of Duration

Dang,

Cui,

et al. 2023

Earth and Space Science

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On 21 May 2021 (local time), an Mw 6.1 earthquake struck the Yangbi County, Yunnan Province, China. The finite fault stochastic simulation approach is usually used to simulate ground motions in high‐frequency band (f > 1 Hz). Model parameters needed for earthquake ground motion simulation mainly include source, path, and site. In the high‐frequency ground motion simulation program widely used in earthquake engineering, the reciprocal of corner frequency is typically used to define the source rise time; however, the complete step‐wise derivation process is unavailable. In deriving the static corner frequency f0, source rise time is typically estimated to be the time required for the rupture to reach 50% of the final location, and the source rise time then can be obtained as 0.27/f0, which is consistent with the hypothesis of corner frequency and rupture velocity, and the correlation and integrity between parameters are established. This study also focuses on the influence of different source rise times and path durations on the simulation results, such as Fourier acceleration spectrum, pseudo‐spectral acceleration, and peak ground acceleration. The results show that the source rise time recommended in this simulation can improve the accuracy of near‐fault ground motion simulations. This study provides suggestions for a reasonable selection of path duration in different engineering applications.

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Section: Resultsmentioning

confidence: 99%

Simulation of Ground Motion From Finite‐Fault Modeling Incorporating the Influence of Duration

Dang,

Cui,

et al. 2023

Earth and Space Science

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“…Peaks in amplitude–frequency mHVSR plots can identify resonance features in the site response (Bonilla et al, 1997, 2002; Cadet et al, 2012; Field and Jacob, 1993, 1995; Nakamura, 1989; Nogoshi and Igarashi, 1970, 1971; Satoh et al, 2001; Theodulidis et al, 1996). These peaks and other mHVSR features are evaluated in this study for their potential to improve site response predictions and reduce uncertainties relative to those from ergodic V S30 -based models.…”

Section: Data Sourcesmentioning

confidence: 99%

Small-strain site response of soft soils in the Sacramento-San Joaquin Delta region of California conditioned on V_S30 and mHVSR

Buckreis,

Stewart,

Brandenberg

et al. 2024

Earthquake Spectra

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Sites located in the Sacramento-San Joaquin Delta region of California typically have peaty-organic soils near the ground surface, which are characteristically soft, with shear wave velocities as low as 30 m/s. These unusually soft geotechnical conditions, which are outside the range of applicability of existing ergodic site amplification models, can be anticipated to produce significant site effects during earthquake shaking. We evaluate site response for 36 seismic stations in the Delta region using non-ergodic methods with low-amplitude ground motion data. We model first-order site effects using a period-dependent relation conditioned on the 30 m time-averaged shear wave velocity ( VS30). Relative to extrapolations of global ergodic models, this Delta-specific model provides lower and higher levels of amplification for short and long periods, respectively. While the local model provides unbiased predictions for Delta sites as a whole, it smooths over site-specific effects such as resonant peaks. Microtremor-based horizontal-to-vertical spectral ratios (mHVSRs) were measured for 34 sites, from which additional site parameters such as peak frequency ( fp), peak amplitude ( ap), and average mHVSR amplitude over some frequency bandwidth ([Formula: see text]) are derived. Sites with prominent mHVSR peaks are found to often exhibit site resonance effects, while sites without prominent peak features generally do not. A modified Ricker wavelet pulse function conditioned on fp is used to model resonance effects, while a logistic function whose amplitude is correlated with [Formula: see text] is used to model general broadband amplification that transitions to zero at long periods. These mHVSR-informed models are implemented as additive components to the VS30-scaling model. Relative to a global ergodic model, the VS30-scaling model does not appreciably change the site-to-site aleatory variability ([Formula: see text]) for periods shorter than about 1.5 s but reduces [Formula: see text] by ~0.1 (natural log units) at long periods. When the mHVSR-informed model components are used, [Formula: see text] is reduced by ~0.05 to 0.1 for short-to-intermediate periods (up to ~2 s). A model for nonlinear effects, derived from nonlinear ground response analyses, will be presented in a separate paper.

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“…Lebih rinci kajian mikrotermor telah banyak digunakan untuk memperkirakan kerusakan yang timbul akibat bencana gempabumi. Kajian ini sangat tepat dan baik dalam memperkirakan tingkat resiko yang disebabkan oleh aktivitas seismik dengan kondisi geologi setempat (Nakamura, 1989).…”

Section: Pendahuluanunclassified

Analisis Mikrometer dengan Metode HVSR (Horizontal to Vertical Spectral Ratio) di Distrik Jayapura Utara, Kota Jayapura

Kayame,

Y.Y. Mantiri,

Marsell

2022

JFP

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Tujuan penelitian ini yaitu untuk menentukan nilai amplifikasi getaran tanah dalam kaitannya dengan frekuensi dominan tanah di Distrik Jayapura Utara, Kota Jayapura dan Menentukan nilai periode dominan tanah di Distrik Jayapura Utara, Kota Jayapura. Metode penelitian yang digunakan adalah Metode Survei Lapangan, dimana dilakukan pengukuran langsung di lapangan dengan mengunakan alat perekaman mikrotremor. Nilai frekuensi dominan, periode dominan, dan amplifikasi, akan ditentukan berdasarkan analisis rekaman sinyal mikrotremor dengan metode HVSR. Nilai frekuensi dominan, periode dominan, dan amplifikasi dengan metode HVSR akan dihitung dengan bantuan software Geopsy versi 2.0.9. Nilai amplifikasi getaran tanah maksimum 17,976800 dengan nilai frekuensi dominan tanah 0,573656 Hz berlokasi di titik JU02 (Halaman Masjid AURI Angkasapura) dan nilai frekuensi dominan amplifikasi getaran tanah minimum 1,410200 dengan frekuensi dominan 0,681167 Hz berlokasi di titik pengukuran JU17. Lokasi disekitar titik JU02 (Halaman Masjid AURI Angkasapura) lebih rawan terhadap gempabumi relatif terhadap yang lain dan lokasi di sekitar titik pengukuran JU17 (Halaman Kantor Pos Jayapura) lebih aman terhadap gempabumi relatif dibandingkan dengan lokasi yang lain. Nilai Periode dominan tanah maksimum 1,847194 s berlokasi di titik pengukuran JU12 (Bayangkara) dan periode dominan tanah Minimum 0,090822 s berlokasi disekitar titik JU02 (Bayangkara) lebih rawan terhadap gempabumi relatif terhadap yang lain dan lokasi disekitar titik pengukuran JU09 (Angkasa Lembah Sunyi) lebih aman terhadap gempabumi relatif dibandingkan dengan lokasi yang lain.

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Ground Vibration Characteristics Induced at High-Speed by Shinkansen and Evaluation Method for Speed Dependency

Abstract: An average increment of Shinkansen-induced ground vibration has already been esti

Cited by 7 publications

References 0 publications

Simulation of Ground Motion From Finite‐Fault Modeling Incorporating the Influence of Duration

Simulation of Ground Motion From Finite‐Fault Modeling Incorporating the Influence of Duration

Small-strain site response of soft soils in the Sacramento-San Joaquin Delta region of California conditioned on V_S30 and mHVSR

Analisis Mikrometer dengan Metode HVSR (Horizontal to Vertical Spectral Ratio) di Distrik Jayapura Utara, Kota Jayapura

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Ground Vibration Characteristics Induced at High-Speed by Shinkansen and Evaluation Method for Speed Dependency

Abstract: An average increment of Shinkansen-induced ground vibration has already been esti

Cited by 7 publications

References 0 publications

Simulation of Ground Motion From Finite‐Fault Modeling Incorporating the Influence of Duration

Simulation of Ground Motion From Finite‐Fault Modeling Incorporating the Influence of Duration

Small-strain site response of soft soils in the Sacramento-San Joaquin Delta region of California conditioned on VS30 and mHVSR

Analisis Mikrometer dengan Metode HVSR (Horizontal to Vertical Spectral Ratio) di Distrik Jayapura Utara, Kota Jayapura

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Product

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Small-strain site response of soft soils in the Sacramento-San Joaquin Delta region of California conditioned on V_S30 and mHVSR