Onshore seismic amplifications due to bathymetric features

A. Rodríguez-Castellanos, M. Carbajal-Romero, N. Flores-Guzmán, E. Olivera-Villaseñor, A. Kryvko

Research output: Contribution to journalArticle

Abstract

© 2016 Sinopec Geophysical Research Institute. We perform numerical calculations for onshore seismic amplifications, taking into consideration the effect of bathymetric features on the propagation of seismic movements. To this end, the boundary element method is applied. Boundary elements are employed to irradiate waves and, consequently, force densities can be obtained for each boundary element. From this assumption, Huygens' principle is applied, and since the diffracted waves are built at the boundary from which they are radiated, this idea is equivalent to Somigliana's representation theorem. The application of boundary conditions leads to a linear system being obtained (Fredholm integral equations). Several numerical models are analyzed, with the first one being used to verify the proposed formulation, and the others being used to estimate onshore seismic amplifications due to the presence of bathymetric features. The results obtained show that compressional waves (P-waves) generate onshore seismic amplifications that can vary from 1.2 to 5.2 times the amplitude of the incident wave. On the other hand, the shear waves (S-waves) can cause seismic amplifications of up to 4.0 times the incident wave. Furthermore, an important result is that in most cases the highest seismic amplifications from an offshore earthquake are located on the shoreline and not offshore, despite the seafloor configuration. Moreover, the influence of the incident angle of seismic waves on the seismic amplifications is highlighted.
Original languageAmerican English
Pages (from-to)597-611
Number of pages535
JournalJournal of Geophysics and Engineering
DOIs
StatePublished - 15 Jul 2016

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Amplification
amplification
Huygens principle
shorelines
Seismic waves
boundary element method
Shear waves
seismic waves
linear systems
Boundary element method
P waves
seismic wave
Integral equations
S waves
P-wave
Linear systems
integral equations
S-wave
Numerical models
shoreline

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Rodríguez-Castellanos, A. ; Carbajal-Romero, M. ; Flores-Guzmán, N. ; Olivera-Villaseñor, E. ; Kryvko, A. / Onshore seismic amplifications due to bathymetric features. In: Journal of Geophysics and Engineering. 2016 ; pp. 597-611.
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Onshore seismic amplifications due to bathymetric features. / Rodríguez-Castellanos, A.; Carbajal-Romero, M.; Flores-Guzmán, N.; Olivera-Villaseñor, E.; Kryvko, A.

In: Journal of Geophysics and Engineering, 15.07.2016, p. 597-611.

Research output: Contribution to journalArticle

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