Fig. 5: Relative amplitude versus offset variation.
From: Discovery of flat seismic reflections in the mantle beneath the young Juan de Fuca Plate
a Observed OBH 501 gather with a reduced velocity of 6 km/s highlighting the part of reflection event (black arrows) used for the amplitude versus offset (AVO) analyses. b Normal moveout corrected gather used for the AVO study. Black arrows highlight the mantle reflection. c Relative amplitude versus offset curves for real data (thick black) and synthetic data with different velocities (−7, −15, −30, +7%) in a 300-m-thick layer for the upper layer. Note that for the increase in velocity, the variation is from +1 to +0.5 and for the decrease in velocity the variation is from −1 to −0.5.
