Table 3.

Reflection seismic interval velocity estimates used for building a time-depth conversion model based on refraction data interpretations

Seismic intervalsOBS model (Kodaira et al. 1998)OBS model (Kandilarov et al. 2012)Velocity data used for time-depth conversionEstimated stratigraphic thickness across the JMMCEstimated stratigraphic thickness OBS model Figure 4 intersection
P-wave model layerVP (km s−1)VP (km s−1)Thickness ranges (km)TST estimate (km)
SeabedWater depth1.490–3.20.95
Plio-PleistoceneCenozoic sediments2.0–3.51.7––1.10.06
Late Oligocene–Early-Miocene2.00–1.050.09
Early Oligocene2.2–3.22.30–2.050.29
Late Eocene
Basalts–Early EoceneBasalt (SDR)4.0–5.03.2–4.14.00–61.48
Early–Mid PaleocenePossible Lower Paleocene–Mesozoic3.9–4.73.9–5.04.40–4.52.25
Possible Mesozoic
Possible PalaeozoicPossible Palaeozoic5.0–5.35.0–5.55.20–43.82
Estimated stratigrahic and igneous section thickness above Caledonian basement:8.64
Possible Caledonian BasementContinental upper crust5.5–6.75.5–6.55.60–152.79
Continental lower crust – sub-basaltContinental lower crust6.7–6.86.5–7.26.80–102.96
Estimated stratigrahic, igneous section, and crustal stratigraphic thickness:14.4
  • Displayed are the possible stratigraphic thickness ranges across the highly variable mapped JMMC, and one specific stratigraphic thickness profile for the reflection seismic data intersection with the OBS model by Kodaira et al. (1998).