%0 Journal Article %T Filtering of a Ricker wavelet induced by anelastic seismic wave propagation and reflection %+ Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) %+ Géosciences Rennes (GR) %A Ker, Stephan %A Le Gonidec, Yves %< avec comité de lecture %@ 1742-2132 %J Journal of Geophysics and Engineering %I IOP Publishing %V 17 %N 5 %P 838-851 %8 2020-10-25 %D 2020 %R 10.1093/jge/gxaa033 %K seismic attenuation %K Q factor %K anelasticity %K seismic data analysis %Z Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]Journal articles %X A varying Q factor with depth induces modifications of seismic wave features due to anelastic propagation but also reflections at the discontinuities. Standard signal analysis methods often neglect the reflection contribution when assessing Q values from seismic data. We have developed an analytical quantification of the cumulative effects of both the propagation and reflection contributions by considering Kjartansson's model and a seismic plane wave at normal incidence on a step-like discontinuity. We show that the cumulative effects are equivalent to a frequency filter characterised by a bandform and phase that both depend on the ratio between the elastic and anelastic contrasts. When considering this filter applied to a Ricker wavelet, we establish an analytical expression of the peak-frequency attribute as a function of propagation and reflection properties. We demonstrate that this seismic attribute depends on the anelastic contrast, which cannot be neglected when assessing Q factors: the error in Q estimate is not linearly dependent on the anelastic contrast and we establish an analytical expression for the case where this contrast is weak. An unexpected phenomenon for a step-like interface is an increase in the peak frequency that is observed when the anelastic and elastic contrasts have opposite signs, with a constraint on the anelastic propagation properties. This behaviour allows for assessment of the elastic and anelastic parameters. %G English %2 https://univ-rennes.hal.science/hal-02989177/document %2 https://univ-rennes.hal.science/hal-02989177/file/gxaa033.pdf %L hal-02989177 %U https://univ-rennes.hal.science/hal-02989177 %~ INSU %~ UNIV-RENNES1 %~ UR2-HB %~ CNRS %~ IFREMER %~ GR %~ OSUR %~ UR1-HAL %~ UR1-SDLM %~ GR-DIMENV %~ UNIV-RENNES2 %~ TEST-UR-CSS %~ UNIV-RENNES %~ INRAE %~ UR1-ENV %~ GR-DEMO %~ RESEAU-EAU