TY - JOUR
T1 - Diffractions due to P and SV waves on irregular bathymetries
AU - Martínez-Calzada, V.
AU - Samayoa-Ochoa, D.
AU - Rodríguez-Castellanos, A.
AU - Flores-Guzmán, N.
AU - Sánchez-Sesma, F. J.
PY - 2014/6
Y1 - 2014/6
N2 - Diffractions of P and SV waves on irregular bathymetries are studied using the indirect boundary element method. This allows us to evaluate the complete displacement field by the superposition of a free field plus a diffracted one. Six elemental bathymetries are analyzed in the frequency domain and normalized displacement spectra are obtained. Hence, synthetic seismograms are generated in order to get a better perspective on the effects caused by the bathymetries. Results in the frequency domain suggest that the absolute value of normalized displacement is amplified almost four times in a sinusoidal bathymetry for incoming P-waves. For the incidence of SV-waves on a semi-circular bathymetry, the amplification reaches a value of five times. Moreover, several kinds of materials for the semi-circular bathymetry are used for comparison purposes, these are: sandstone, limestone and granite. Results for these materials reveal that sandstone produces an amplification of almost 3.5 times an incident P-wave. Therefore, seismic amplifications should be taken into account when marine foundations or pipelines are designed.
AB - Diffractions of P and SV waves on irregular bathymetries are studied using the indirect boundary element method. This allows us to evaluate the complete displacement field by the superposition of a free field plus a diffracted one. Six elemental bathymetries are analyzed in the frequency domain and normalized displacement spectra are obtained. Hence, synthetic seismograms are generated in order to get a better perspective on the effects caused by the bathymetries. Results in the frequency domain suggest that the absolute value of normalized displacement is amplified almost four times in a sinusoidal bathymetry for incoming P-waves. For the incidence of SV-waves on a semi-circular bathymetry, the amplification reaches a value of five times. Moreover, several kinds of materials for the semi-circular bathymetry are used for comparison purposes, these are: sandstone, limestone and granite. Results for these materials reveal that sandstone produces an amplification of almost 3.5 times an incident P-wave. Therefore, seismic amplifications should be taken into account when marine foundations or pipelines are designed.
KW - Elastic waves
KW - IBEM
KW - Irregular bathymetries
KW - Seismogram
UR - http://www.scopus.com/inward/record.url?scp=84902003330&partnerID=8YFLogxK
U2 - 10.1088/1742-2132/11/3/035006
DO - 10.1088/1742-2132/11/3/035006
M3 - Artículo
SN - 1742-2132
VL - 11
JO - Journal of Geophysics and Engineering
JF - Journal of Geophysics and Engineering
IS - 3
M1 - 035006
ER -