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Surface wave dispersion from small vertical scatterers
Author(s) -
van Wijk K.,
Levshin A. L.
Publication year - 2004
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2004gl021007
Subject(s) - scattering , dispersion (optics) , homogeneous , surface wave , geology , surface (topology) , wave propagation , geophysics , physics , optics , computational physics , geometry , statistical physics , mathematics
Heterogeneity in the subsurface creates conflicting types of dispersion of seismic waves. A laboratory and numerical experiment show that multiple scattering of elastic waves from isolated heterogeneities near the surface not only attenuates, but also delays coherent events. Because scattering off these impedance contrasts is frequency dependent, multiple scattering is a source of dispersion. If ignored, multiple scattering dispersion could be erroneously attributed to a model with horizontal homogeneous layers of different wave speeds.