Fig. 2: Seismic P-wave velocity structure along our wide-angle seismic profile across LT and TH.

a Elevation of the seismic profile with location of faults and suture zones (red arrows) and location of different terranes (color line). b Crustal velocity structure along the seismic profile. Seismic sources: red stars; velocity discontinuities: white lines; location of earthquakes within a 100 km wide corridor: black circles; c Horizontal resolution for the velocity model estimated as the Fresnel zone width. d Ray tracing coverage of the seismic model for the end shots 01 and 10, illustrating the high resolution of the lower crust and depth to Moho, see also Supplementary Fig. 5. e Traveltime fit for seismic phases for the two end shots. Lines show calculated traveltimes and vertical bars show observed traveltimes with length of bar corresponding to uncertainty of pick. f Seismic section for SP01 reduced by 8 km/s with traveltime picks. g Seismic section for the reversed SP10 with traveltime picks. Abbreviations as in Fig. 1.