Detection and characterization of anelastic AVF with the Gabor transform

Jesse M. Kolb, Kristopher A. Innanen

Amplitude variation with frequency (AVF) inversion can be used to estimate Q given anelastic frequency-dependent reflection coefficients. While AVF signal is generally analyzed event-by-event, traces are usually populated with many events at different arrival times. This creates the need to perform time-frequency analysis in order to isolate the reflectivity from a single event. We choose the Gabor transform as the instrument for our analysis and use it to estimate frequency-dependent reflectivities from synthetic traces. These reflectivities are then inverted to obtain accurate Q estimates. In order to test limits of this method, we also tested its performance under increasing noise levels, as well as with a reflection from a second interface that is close to the interface in which we are interested.