Extended Data Fig. 2: Imaging approach: P-wave velocity gradient models derived from traveltime tomography and elastic full waveform inversion of downward extrapolated multichannel seismic data along profile 05CM-38, central Hikurangi convergent margin, New Zealand.
From: Physical conditions and frictional properties in the source region of a slow-slip event
a Traveltime tomography P-wave velocity gradient structure (see Supplementary Movie 1); b Elastic full waveform inversion P-wave velocity gradient structure derived after a from refraction and wide-angle reflection seismic energy ahead of the seafloor reflection arrival in downward extrapolated MCS data (see Supplementary Movie 2). c Elastic full waveform inversion P-wave velocity gradient structure derived after a and b from the seismic reflection energy below the seafloor reflection and above the first seafloor multiple in downward extrapolated MCS data (see Supplementary Movie 3).
