Rl. Nowack et Mp. Matheney, INVERSION OF SEISMIC ATTRIBUTES FOR VELOCITY AND ATTENUATION STRUCTURE, Geophysical journal international, 128(3), 1997, pp. 689-700
We have developed an inversion formulation for velocity and attenuatio
n structure using seismic attributes, including envelope amplitude, in
stantaneous frequency and arrival times of selected seismic phases. We
refer to this approach as AFT inversion for amplitude, (instantaneous
) frequency and time. Complex trace analysis is used to extract the di
fferent seismic attributes. The instantaneous frequency data are conve
rted to t using a matching procedure that approximately removes the e
ffects of the source spectra. To invert for structure, ray-perturbatio
n methods are used to compute the sensitivity of the seismic attribute
s to variations in the model. An iterative inversion procedure is then
performed from smooth to less smooth models that progressively incorp
orates the shorter-wavelength components of the model. To illustrate t
he method, seismic attributes are extracted from seismic-refraction da
ta of the Ouachita PASSCAL experiment and used to invert for shallow c
rustal velocity and attenuation structure. Although amplitude data are
sensitive to model roughness, the inverted velocity and attenuation m
odels were required by the data to maintain a relatively smooth charac
ter. The amplitude and t data were needed, along with the traveltimes
, at each step of the inversion in order to fit all the seismic attrib
utes at the final iteration.