FN Archimer Export Format
PT J
TI Filtering of a Ricker wavelet induced by anelastic seismic wave propagation and reflection
BT 
AF KER, Stephan
   Le Gonidec, Yves
AS 1:1;2:2;
FF 1:PDG-REM-GM-LAD;2:;
C1 IFREMER, Géosciences Marines, Centre de Brest, 29280 Plouzané, France
   Univ Rennes, CNRS, Géosciences Rennes, UMR 6118, 35000 Rennes, France
C2 IFREMER, FRANCE
   UNIV RENNES, FRANCE
SI BREST
SE PDG-REM-GM-LAD
IN WOS Ifremer UPR
   copubli-france
   copubli-univ-france
IF 2.087
TC 1
UR https://archimer.ifremer.fr/doc/00640/75240/75398.pdf
LA English
DT Article
DE ;seismic attenuation;Q factor;anelasticity;seismic data analysis
AB 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 the 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 characterized 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 assessing the elastic and anelastic parameters. 
PY 2020
PD OCT
SO Journal Of Geophysics And Engineering
SN 1742-2132
PU Oxford
VL 17
IS 5
UT 000592214000005
BP 838
EP 851
DI 10.1093/jge/gxaa033
ID 75240
ER

EF