Fig. 2: Seismic velocity model with data for the two-shot sections at the end of the onshore part of the profile.
From: Northern Scandinavian mountains supported by a low-grade eclogitic crustal keel
a Hypsometry with traversed geological units and locations of seismic sources (stars): red for onshore explosive sources SP1-5, and blue for offshore airgun stack locations AGS01-12. CDF Caledonian Deformation Front, TIB outcrop of Trans-Scandinavian Igneous Belt within the Caledonian deformed region. b P-wave velocity model based on raytracing modelling and inversion; light grey indicates unconstrained parts of the model. Coverage is marked by thick black lines for wide-angle reflection and thin lines for refraction interfaces (solid for two-way coverage and stippled for one-way coverage). c Ray path coverage of the profile. Ray coverage of the seismic discontinuities is also shown for reflections above and refractions below the discontinuities. d Travel time match for sources illustrated in (c): Observed travel times are shown by vertical marks with length corresponding to the uncertainty of picks, solid lines—calculated arrival times; annotations as in text. e, f Seismic sections with travel time picks for SP1 and SP5. Calculated arrival times for model in (b) are shown by lines with colour coding as in (c, d). Similar plots are shown for selected airgun stack sections and all onshore sections in Supplementary Figs. 2–9.
