3D Ground Response Analysis of Simplified Kutch Basin by Spectral Element Method

Vijaya, R.; Boominathan, A.; Mazzieri, Ilario

doi:10.1142/s1793431120500037

Cited by 9 publications

(2 citation statements)

References 38 publications

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“…The main numerical simulation methods are the finite element method (Bao et al, 1998), the finite difference method (Olsen and Schuster, 1995;Graves et al, 1998;Lee et al, 2008), the boundary element method (Lee, 2013;Semblat et al, 2022;Huang et al, 2022), and the Spectral Element Method (SEM) (Smerzini and Villani, 2012;Liu et al, 2013;Abraham et al, 2016;Vijaya et al, 2020). Finite difference methods are prone to numerical dispersion near large gradients in the wavefield or when the used grid is too coarse.…”

Section: Introductionmentioning

confidence: 99%

3D seismic simulation analysis of the Longtoushan Town Basin during the 2014 Ludian earthquake, Yunnan province

Liu

et al. 2023

Front. Earth Sci.

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On 3 August 2014, a magnitude Ms 6.5 earthquake struck Ludian County, Zhaotong City, Yunnan Province, causing grave losses of life and property in the Longtoushan Town Basin near the fault. In this study, a three-dimensional model of the Longtoushan Town Basin and the velocity structure of the surrounding area, and the Spectral Elements in Elastic Dynamics code, which combines the discontinuous Galerkin technique and the spectral element method (SEM) are used to simulate and study the entire seismic wave propagation process. The results show that due to the variations in the basin geometry and the impedance ratio of the media inside and outside the basin, the seismic waves incident on the basin edge are refracted and diffracted, further prolonging the ground motion holding time within the basin. In the bedrock outside the basin, the velocity peaks are higher at higher elevations; viceversa within the basin, the locally depressed basement produces an obvious amplification effect. The amplitude of the ground motion is not the greatest in the thickest sedimentary layers in the basin, and it is closely related to the degree of undulation at the base of the sedimentary layers, the overburden thickness, and the basin geometry. The peak ground accelerations (PGAs) of approximately 8 m/s2 in the east–west (E–W) direction and 3 m/s2 in the north–south (N–S) direction are influenced by the rupture directivity effect (the ruptured surface is the Baogunao–Xiaohe fault that is oriented in the N–W direction). The peak ground velocity with a sedimentary model is 2.6 and 1.6 times that of the non-sedimentary model in the E–W and N–S directions, respectively. The maximum amplification factor for PGA in the E–W direction is 2.8 and that in the N–S direction is approximately 2.3. The results are in agreement with the actual observed seismic station data in terms of the waveforms and peaks, and the intensity distribution map matches the actual damage distribution. This proves the accuracy and rationality of the method used in this study. The results are useful for the seismic zoning of cities, and they can help engineers predict ground motions for future large earthquakes.

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Section: Introductionmentioning

confidence: 99%

3D seismic simulation analysis of the Longtoushan Town Basin during the 2014 Ludian earthquake, Yunnan province

Liu

et al. 2023

Front. Earth Sci.

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“…Some scholars have studied valley sites with analytical solutions [8][9][10][11][12][13][14][15][16][17][18]. e numerical analyses can be classified into three types: domain-type [19][20][21][22][23][24], boundarytype [25][26][27][28][29][30][31][32][33], and hybrid-type [34][35][36][37]. For a more comprehensive and extensive review of topographic effects, refer to Zhou [38].…”

Section: Introductionmentioning

confidence: 99%

Amplification Effect of Ground Motion in Offshore Meandering Sedimentary Valley

Wang

Yan

Liu

et al. 2021

Shock and Vibration

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A sedimentary valley has a visible amplification effect on a seismic response, and the current 2D topographies cannot truthfully reflect the twists and turns of a large-scale river valley. Taking a sinusoidal curved valley site as a model, the dynamic finite element analysis method and the introduction of a viscoelastic artificial boundary were developed to study the 3D seismic response of the dimensional topographies in the homogeneous curved valley to vertical incident P, SV, and SH waves. The results showed that the bending sedimentary valley site earthquake presented significant features simultaneously, depending on the number of valley bends, the frequency of the excitations, the shear wave velocity of sedimentary soil, and the depth of the river valley. The surface displacement amplitudes of three-dimensional meandering sedimentary valleys are significantly different from those of sedimentary basins. The amplification area of the meandering valley is related to the angle between the valley axis and wave vibration direction, and the amplification effect is significant when the angle is small. The movement in the main direction showed a center focus, and the secondary y-direction displacement showed both a central focus and an edge effect. When the frequency of the incident wave was close to the natural vibration frequency in a specific direction, the movement in this direction significantly increased because of the resonance effect. The displacement amplitude of the surface was proportional to the depth of the river valley, and the surface displacement was presented in different forms based on the frequency of the excitations. The results provided some guidance for the earthquake resistance of the curved valley site.

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Numerical Modelling of Basin Effects on Earthquake Ground Motions in Kutch Basin

Boominathan

Vijaya

2022

Advances in Earthquake Geotechnics

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3D Ground Response Analysis of Simplified Kutch Basin by Spectral Element Method

Cited by 9 publications

References 38 publications

3D seismic simulation analysis of the Longtoushan Town Basin during the 2014 Ludian earthquake, Yunnan province

3D seismic simulation analysis of the Longtoushan Town Basin during the 2014 Ludian earthquake, Yunnan province

Amplification Effect of Ground Motion in Offshore Meandering Sedimentary Valley

Numerical Modelling of Basin Effects on Earthquake Ground Motions in Kutch Basin

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