Premium
Amplification of SH waves by an orthotropic basin
Author(s) -
Zheng Tao,
Dravinski Marijan
Publication year - 1998
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/(sici)1096-9845(199803)27:3<243::aid-eqe727>3.0.co;2-j
Subject(s) - orthotropic material , anisotropy , isotropy , geology , structural basin , sedimentary basin , displacement (psychology) , scattering , geophysics , geometry , mechanics , physics , optics , geomorphology , finite element method , mathematics , psychology , psychotherapist , thermodynamics
Scattering of elastic waves by an orthotropic sedimentary basin is investigated for antiplane strain model using an indirect boundary integral equation approach. Both steady state and transient response were obtained for semicircular and semielliptical basins with different material properties. The results indicate that the basin geometry and the impedance contrast between the half‐space and the basin have similar effects on the surface ground motion amplification as for the isotropic case. However, the material anisotropy may change significantly the fundamental resonant frequencies of the basin, resulting in different surface displacement amplification patterns. In addition, it was observed that the arrival time of the main disturbance on the surface strongly depends on material anisotropy for different angles of incidence. The results demonstrate that material anisotropy may be very important in explaining surface ground motion amplification for sedimentary basins. © 1998 John Wiley & Sons, Ltd.