Seismic record section from shotpoint E to the SW. Inset: left—1‐D velocity–depth function; right—P‐wave record section showing traveltime curves computed from the 1‐D model on the left. The 1‐D modelling suggests the presence of a high‐velocity layer near 5 km depth. The area near shotpoint F is shown enlarged. Main diagram: near shotpoint F the DEKORP reflection system has recorded all shots with a geophone spacing of about 80 m (96 channels). Here these data were particularly useful in identifying the near‐surface reflection P_i1 P.