A hybrid indirect boundary element—discrete wave number method applied to simulate the seismic response of stratified alluvial valleys

Gil-Zepeda, S. A.; Montalvo‐Arrieta, Juan C.; Vai, Rossana; Sánchez‐Sesma, Francisco J.

doi:10.1016/s0267-7261(02)00092-1

Cited by 41 publications

(7 citation statements)

References 11 publications

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“…The verification of this analysis has been done by comparing to the solution of Kawase and Aki (1989) [28], and presented at [29] and Khanbabazadeh and Iyisan (2014 a,b) [30][31]. The solution of the trapezoidal valley by Kawase and Aki (1989) [28] has been tested by Zahradnik (1995) [32] and Gil-Zepeda et al (2003) [33], among the others.…”

Section: Analysis Methodsmentioning

confidence: 99%

Basin Edge Effect at Turkish Basins: The Case Study of Dinar and Duzce Basins

Khanbabazadeh¹,

İyisan²,

Hasal³

et al. 2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Several studies have revealed that the inclined bedrock at the sides of the basins bring about the concentration of damages, which well known as basin edge effect. As a seismically active area much of the Turkey lies on the Anatolian Plate. This small plate bounded by two major strike-slip fault zones, the North Anatolian Fault and East Anatolian Fault. During the history, Turkey has been the site of devastating earthquakes. Severe structural damage at basin sides during recent major earthquakes around the world strongly pointed out the importance of basin edge effect. Some of its notable examples can be tracked in Turkey. With respect to the fact that Turkey is among the top 20 percent of all countries exposed to earthquake hazard with regard to mortality and economic losses, the necessity of the investigation and consideration of the basin edge effect in earthquake design codes is revealed. In this study, the dynamic behavior at the edge of two real basins is investigated. In this study, at the first, the basin edge model of the basins are extracted from the data obtained from extensive microtremor surveys and geotechnical investigations as well as insitu studies including SPT, CPT, PS logging tests. Then, the idealized geometry of the Dinar and Duzce basins edge models are proposed. Afterwards, the basins are subjected to the collection of strong ground motions using a fully nonlinear method which works based on explicit finite difference scheme FLAC3D code. The 5566 COMPDYN 2019 7 th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering M. Papadrakakis, M. Fragiadakis (eds.

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Section: Analysis Methodsmentioning

confidence: 99%

Basin Edge Effect at Turkish Basins: The Case Study of Dinar and Duzce Basins

Khanbabazadeh¹,

İyisan²,

Hasal³

et al. 2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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“…The same acceleration pattern has been captured across the model surface and given in Figure 11. The result of the Kawase and Aki (1989) analysis also has been tested by Iyisan and Khanbabazadeh (2014), Gil-Zepeda et al (2003). The properties of the materials in the model have been defined by 1000-2500 m/s shear wave velocities (Vs), and the unit weight of materials have been taken as the same to provide a constant impedance value concerning the compared model.…”

Section: Verification Of the Wave Propagationmentioning

confidence: 99%

Assessment of the Design Spectrum with Aggravation Factors by 2D Nonlinear Numerical Analyses: A Case Study in Gemlik Basin, Turkey

Özaslan

İyisan

Hasal

et al. 2021

Preprint

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The response spectra of multidimensional analyses are compared with the one-dimensional (1D) local models to couple the irregular soil stratification effect in a site. In recent studies, the surface motion spectra ratios of 2D/1D or 3D/1D are defined as spectral aggravation factors for each region in a site. Particularly in alluvial basins, where the soil media is typically formed by fault ruptures or topographic depressions filled with sediments, the inclination of the rock outcrop in the edge of the basin has a considerable effect on the site response, and such effect has not yet been taken into consideration of recent seismic building codes and general engineering applications. In this study, the natural alluvial basin near the North Anatolian Fault in Gemlik, Maramara Region, Turkey, was investigated by 40 seismic site tests and 4 validation borings. The 2D and 1D nonlinear response history analyses in north-south and east-west directions of the Gemlik basin were performed by numerical model on finite difference scheme considering nonlinear elasto-plastic material behaviors and geometric discontinuities. 22 strong ground motions recorded on rock site are excited vertically as SH waves. The numerical results exhibited the narrow basin effects are derived not only by reflection, refraction, and shifting behavior but also by focusing and superposition of the seismic waves propagating from both opposite basin edges. As a result, the site-specific spectral aggravation factors, SAF2D/1D defined by the ratio between the 2D and 1D acceleration response spectra for each period and any location on the site, were proposed for the Gemlik basin. The variations of the aggravation factors were observed as increasing values to 1.2–2.2 on the near edge and basin center.

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“…The objective here is to obtain synthetic (or artificial) seismograms at receiver points along the free surface of the local geological profile Ω LGR . The original problem can be split into two sub‐problems, see Gil‐Zepeda et al 33; Alvarez‐Rubio et al 34; Luzon et al 35: (a) the external sub‐problem that focuses on wave propagation outside the localized region Ω LGR and (b) the internal sub‐problem that deals with seismic wave scattering inside the localized region Ω LGR . More specifically, the external sub‐problem evaluates the total wave field from superposition of the incident primary and scattered waves.…”

Section: Problem Formulation and Mathematical Modelmentioning

confidence: 99%

Seismic wave propagation in laterally inhomogeneous poroelastic media via BIEM

Dineva

Datcheva

Manolis

et al. 2010

Num Anal Meth Geomechanics

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This work addresses in-plane pressure P and vertically polarized shear SV seismic wave propagation in a finite, laterally inhomogeneous, multilayered poroelastic geological region resting on the homogeneous elastic half-space. The particular approach followed here is based on a combination of the (i) viscoelastic approximation (isomorphism) to Biot's equations of dynamic poroelasticity and on the (ii) boundary integral equation method (BIEM) using frequency-dependent fundamental solutions of the governing wave equations. The problem is formulated under plane strain conditions and time-harmonic motions are assumed. Validation of the viscoelastic isomorphism and verification of the BIEM is done by solution of benchmark examples.These simulation studies reveal that the proposed methodology is able to depict a sensitivity of the seismic signals recovered to the following parameters: (i) poroelastic properties of fluid saturated layers; (ii) lateral geological inhomogeneity; (iii) surface topography and (iv) frequency content and direction of the incident wave.It is concluded that the combination of viscoelastic isomorphism with BIEM software provides an effective numerical tool for evaluating site-effect phenomena in multilayered, fluid saturated geological regions with complex geometry. The numerical results obtained demonstrate that dynamic poroelasticity interacting with other physical peculiarities of the Earth's surface layers, such as lateral heterogeneity, material properties along the wave path, local geological profile and type of elastic wave, gives rise to complex seismic signals on the free surface at the site of interest.

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A hybrid indirect boundary element—discrete wave number method applied to simulate the seismic response of stratified alluvial valleys

Cited by 41 publications

References 11 publications

Basin Edge Effect at Turkish Basins: The Case Study of Dinar and Duzce Basins

Basin Edge Effect at Turkish Basins: The Case Study of Dinar and Duzce Basins

Assessment of the Design Spectrum with Aggravation Factors by 2D Nonlinear Numerical Analyses: A Case Study in Gemlik Basin, Turkey

Seismic wave propagation in laterally inhomogeneous poroelastic media via BIEM

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