Seismic pressures in offshore areas: Numerical results

Norberto Flores-Guzmán, Enrique Olivera-Villaseñor, Andriy Kryvko, Alejandro Rodríguez-Castellanos, Francisco Sánchez-Sesma

Research output: Contribution to journalArticle

Abstract

© 2016, Brazilian Association of Computational Mechanics. All rights reserved. The purpose of this study is to obtain numerical estimations of seismic pressures in offshore areas considering the effect of seabed configurations and soil materials. To this end, the Boundary Element Method is used to irradiate waves, so that force densities can be obtained for each boundary element. From this hypothesis, Huygens’ Principle is implemented since the diffracted waves are constructed at the boundary from which they are radiated. Application of boundary conditions allows us to determine a system of integral equations of Fredholm type of second kind and zero order. Various models were analyzed, the first one is used to validate the proposed formulation. Other models of ideal seabed configurations are developed to estimate the seismic pressure profiles at several locations. The influence of P- and SV-wave incidence was also highlighted. In general terms, it was found that soil materials with high wave propagation velocities generate low pressure fields. The difference between the maximum pressure values obtained for a soil material with shear wave velocity of β=3000 m/s is approximately 9 times lower than those obtained for a material with β=90 m/s, for the P-wave incidence, and 2.5 times for the case of SV-waves. These results are relevant because the seabed material has direct implications on the field pressure obtained. A relevant finding is that the highest seismic wave pressure due to an offshore earthquake is almost always located at the sea-floor.
Original languageAmerican English
Pages (from-to)2762-2784
Number of pages23
JournalLatin American Journal of Solids and Structures
DOIs
StatePublished - 1 Jan 2016

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Soils
Insulator Elements
Computational mechanics
Seismic waves
Shear waves
Boundary element method
Wave propagation
Integral equations
Earthquakes
Boundary conditions

Cite this

Flores-Guzmán, N., Olivera-Villaseñor, E., Kryvko, A., Rodríguez-Castellanos, A., & Sánchez-Sesma, F. (2016). Seismic pressures in offshore areas: Numerical results. Latin American Journal of Solids and Structures, 2762-2784. https://doi.org/10.1590/1679-78252376
Flores-Guzmán, Norberto ; Olivera-Villaseñor, Enrique ; Kryvko, Andriy ; Rodríguez-Castellanos, Alejandro ; Sánchez-Sesma, Francisco. / Seismic pressures in offshore areas: Numerical results. In: Latin American Journal of Solids and Structures. 2016 ; pp. 2762-2784.
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Flores-Guzmán, N, Olivera-Villaseñor, E, Kryvko, A, Rodríguez-Castellanos, A & Sánchez-Sesma, F 2016, 'Seismic pressures in offshore areas: Numerical results', Latin American Journal of Solids and Structures, pp. 2762-2784. https://doi.org/10.1590/1679-78252376

Seismic pressures in offshore areas: Numerical results. / Flores-Guzmán, Norberto; Olivera-Villaseñor, Enrique; Kryvko, Andriy; Rodríguez-Castellanos, Alejandro; Sánchez-Sesma, Francisco.

In: Latin American Journal of Solids and Structures, 01.01.2016, p. 2762-2784.

Research output: Contribution to journalArticle

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AU - Flores-Guzmán, Norberto

AU - Olivera-Villaseñor, Enrique

AU - Kryvko, Andriy

AU - Rodríguez-Castellanos, Alejandro

AU - Sánchez-Sesma, Francisco

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Y1 - 2016/1/1

N2 - © 2016, Brazilian Association of Computational Mechanics. All rights reserved. The purpose of this study is to obtain numerical estimations of seismic pressures in offshore areas considering the effect of seabed configurations and soil materials. To this end, the Boundary Element Method is used to irradiate waves, so that force densities can be obtained for each boundary element. From this hypothesis, Huygens’ Principle is implemented since the diffracted waves are constructed at the boundary from which they are radiated. Application of boundary conditions allows us to determine a system of integral equations of Fredholm type of second kind and zero order. Various models were analyzed, the first one is used to validate the proposed formulation. Other models of ideal seabed configurations are developed to estimate the seismic pressure profiles at several locations. The influence of P- and SV-wave incidence was also highlighted. In general terms, it was found that soil materials with high wave propagation velocities generate low pressure fields. The difference between the maximum pressure values obtained for a soil material with shear wave velocity of β=3000 m/s is approximately 9 times lower than those obtained for a material with β=90 m/s, for the P-wave incidence, and 2.5 times for the case of SV-waves. These results are relevant because the seabed material has direct implications on the field pressure obtained. A relevant finding is that the highest seismic wave pressure due to an offshore earthquake is almost always located at the sea-floor.

AB - © 2016, Brazilian Association of Computational Mechanics. All rights reserved. The purpose of this study is to obtain numerical estimations of seismic pressures in offshore areas considering the effect of seabed configurations and soil materials. To this end, the Boundary Element Method is used to irradiate waves, so that force densities can be obtained for each boundary element. From this hypothesis, Huygens’ Principle is implemented since the diffracted waves are constructed at the boundary from which they are radiated. Application of boundary conditions allows us to determine a system of integral equations of Fredholm type of second kind and zero order. Various models were analyzed, the first one is used to validate the proposed formulation. Other models of ideal seabed configurations are developed to estimate the seismic pressure profiles at several locations. The influence of P- and SV-wave incidence was also highlighted. In general terms, it was found that soil materials with high wave propagation velocities generate low pressure fields. The difference between the maximum pressure values obtained for a soil material with shear wave velocity of β=3000 m/s is approximately 9 times lower than those obtained for a material with β=90 m/s, for the P-wave incidence, and 2.5 times for the case of SV-waves. These results are relevant because the seabed material has direct implications on the field pressure obtained. A relevant finding is that the highest seismic wave pressure due to an offshore earthquake is almost always located at the sea-floor.

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JO - Latin American Journal of Solids and Structures

JF - Latin American Journal of Solids and Structures

SN - 1679-7817

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Flores-Guzmán N, Olivera-Villaseñor E, Kryvko A, Rodríguez-Castellanos A, Sánchez-Sesma F. Seismic pressures in offshore areas: Numerical results. Latin American Journal of Solids and Structures. 2016 Jan 1;2762-2784. https://doi.org/10.1590/1679-78252376