Figure F7. Synthetic seismogram computed from the LWD density log and velocity values hand-picked from ISONIC dispersion plots with field seismic data near the prism site (ODP Site 808). The LWD data were recorded from 160 mbsf to the total drilled depth of the hole, and the shallow velocity structure at this site is unknown. Integrated transit time and LWD log curves, the primary reflectors and seismic source, and computed synthetic traces are presented in addition to the synthetic–seismic overlay. The synthetic and seismic reflections at the seafloor, frontal thrust, and at the décollement fault correlate well after correcting the average LWD velocity for the effect of transverse anisotropy in the prism sediments. RHOB = LWD density (g/cm3), DT = LWD compressional slowness (ms/ft).

Figure F7. Synthetic seismogram computed from the LWD density log and velocity values hand-picked from ISONIC dispersion plots with field seismic data near the prism site (ODP Site 808). The LWD data were recorded from 160 mbsf to the total drilled depth of the hole, and the shallow velocity structure at this site is unknown. Integrated transit time and LWD log curves, the primary reflectors and seismic source, and computed synthetic traces are presented in addition to the synthetic–seismic overlay. The synthetic and seismic reflections at the seafloor, frontal thrust, and at the décollement fault correlate well after correcting the average LWD velocity for the effect of transverse anisotropy in the prism sediments. RHOB = LWD density (g/cm³), DT = LWD compressional slowness (ms/ft).