Figure F10. Three alternative correlations between synthetic and observed data using the synthetic seismogram from Scenario 3 (Fig. F9C). For each interpretation, the velocity function used is shown together with lithologic units (color coded by unit), and the synthetic seismogram is plotted immediately to the right. Twenty wiggle traces and 200 variable density traces from SCREECH Line 2 MCS data at Site 1276 are plotted for comparison; wiggle traces best represent observed amplitudes at the drill site. Synthetics generated for all three interpretations recover the first-order features observed in the MCS reflection data. Red dashed lines = interpreted correlations between synthetic and observed data. A. Interpretation 1: the Unit 1/2 boundary correlates with the AU1 reflection (~7.02 s), and the Unit 4/5 boundary correlates to the apparent seismic unconformity at ~7.19 s in reflection data. B. Interpretation 2: the Unit 1/2 boundary corresponds to the AU2 reflection (~6.96 s), and the Unit 4/5 boundary corresponds to the reflection at ~7.16 s. C. Interpretation 3: the Unit 1/2 boundary corresponds to the reflection beneath the AU1 reflection (~7.04 s), and the Unit 4/5 boundary corresponds to the reflection at ~7.22 s. See text for discussion of each interpretation.