Wave velocities depending on shear strain, directionality, and excess pore water pressure from wildlife liquefaction array

Kishida, Tadahiro; Tsai, Chi‐Chin

doi:10.1007/s10518-021-01074-4

Cited by 8 publications

(4 citation statements)

References 25 publications

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“…Table 1 lists the linear and hyperbolic model coefficients along with their p values for all of the NEHRP site classes defined in the Evaluation of Linear Site-Response Residuals section of the article as well as for NEHRP site classes A through CD and D through E from Figure 6 and all site classes combined (NEHRP site classes A through E). Figure 6 confirms the expectation that the relationship between PGA and I g is generally linear at small-to-moderate strains as predicted by the hyperbolic model and shown empirically by Wang et al (2018), Gue´guen (2016), Gue´guen et al (2019), and Kishida and Tsai (2021). The apparent deviations in this trend are discussed in the following section of the article.…”

Section: Pga Versus Strainsupporting

confidence: 84%

“…Figure 6 confirms the expectation that the relationship between PGA and I γ is generally linear at small-to-moderate strains as predicted by the hyperbolic model and shown empirically by Wang et al (2018), Guéguen (2016), Guéguen et al (2019), and Kishida and Tsai (2021). The apparent deviations in this trend are discussed in the following section of the article.…”

Section: Nonlinear Site Response and Shear Strainsupporting

confidence: 83%

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Empirical nonlinear site effects in Japanese megathrust earthquakes

Campbell¹,

Bozorgnia

Kuehn

et al. 2022

Earthquake Spectra

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In the course of developing ground-motion models (GMMs) of peak ground acceleration (PGA) for Japanese megathrust earthquakes, we discovered that empirical nonlinear site effects from these events are very different from those found for shallow crustal earthquakes in California and other global active tectonic regions. In particular, nonlinearity in site response is much less prominent in Japan than these other regions, which is consistent with other empirical and theoretical ground-response studies using recordings from both crustal and subduction earthquakes. In this study, we used the residuals from Japanese megathrust GMMs that account for linear site response to develop a nonlinear site-response term that uses the value of PGA on rock as a measure of ground-motion severity and the value of time-averaged shear-wave velocity in the top 30 m of a site ( VS30) as a measure of site properties. The resulting residuals are unbiased and trendless over all PGA values of interest. We also investigated whether soil nonlinearity can be modeled using proxies for shear stress and shear strain. We found deviations from expected linearity unrelated to nonlinear site effects at small values of strain—believed to be due to network accelerograph trigger thresholds—and at large earthquake magnitudes, believed to be due to the shape of the source spectrum.

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Section: Pga Versus Strainsupporting

confidence: 84%

Section: Nonlinear Site Response and Shear Strainsupporting

confidence: 83%

Empirical nonlinear site effects in Japanese megathrust earthquakes

Campbell¹,

Bozorgnia

Kuehn

et al. 2022

Earthquake Spectra

View full text Add to dashboard Cite

show abstract

“…Finally, a fourth-order Butterworth bandpass filter with a passband from 0.5 to 40 Hz is applied to the corrected acceleration to remove the potential influence of surface waves. 50 After calculating the deconvolution function by Equation 5, we can obtain the Green function in time domain through the inverse Fourier transformation. Then the Green function is resampled to 20,000 Hz to enhance the time resolution, where the peak times of the Green function on the positive semi axis and the negative semi axis represent the travel time of the upward and downward waves between the selected two sensors.…”

Section: Shear Wave Velocity and Modulus Degradationmentioning

confidence: 99%

“…Then a quadratic is fitted to the integrated velocity and the derivative of the quadratic is removed from the acceleration. Finally, a fourth‐order Butterworth bandpass filter with a passband from 0.5 to 40 Hz is applied to the corrected acceleration to remove the potential influence of surface waves 50 …”

Section: Assessment Of In‐situ Soil Dynamic Parametersmentioning

confidence: 99%

Reproducing ground response using in‐situ soil dynamic parameters

Miao

Liu

et al. 2022

Earthq Engng Struct Dyn

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In this study, we extracted the in-situ soil dynamic parameters that contains shear wave velocity, shear modulus degradation curve and damping ratio from seismic data recorded at the Delaney Park Digital Array (DPDA) during the 2018 Mw 7.0 Anchorage earthquake. Based on these parameters, a one-dimensional finite element model in DEEPSOIL is constructed to simulate the propagation of seismic waves in near-surface, and the simulated pseudo-spectral accelerations with 5% damping from the in-situ soil dynamic parameters are compared with those from different velocity profiles and damping models. The results show that: (1) it is necessary to consider the effects of downward waves on the estimation of shear strain when extracting the modulus degradation curve, otherwise the shear strain will be overestimated by several times at this site; (2) the validity and reliability of the use of the in-situ soil dynamic parameters in reproducing and predicting nonlinear ground response are verified, in which the Pearson correlation coefficients between the simulated and observed spectral accelerations at different depths for five selected events are generally higher than 0.95; (3) the ground response analysis exhibits relatively high sensitivity to both velocity profiles and damping models, where the velocity profile extracted from vertical seismic data obviously outperforms other velocity profiles, and the Rayleigh damping provides an alternative to the constant damping model in this study.

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Nonlinear site response at liquefiable sites: Insights from downhole seismic observations

Zhan

Chen

2022

Engineering Geology

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Wave velocities depending on shear strain, directionality, and excess pore water pressure from wildlife liquefaction array

Cited by 8 publications

References 25 publications

Empirical nonlinear site effects in Japanese megathrust earthquakes

Empirical nonlinear site effects in Japanese megathrust earthquakes

Reproducing ground response using in‐situ soil dynamic parameters

Nonlinear site response at liquefiable sites: Insights from downhole seismic observations

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