TOPAS subbottom profiler (SBP) data acquired during research voyage TAN2006 with R/V Tangaroa (2020)

General information Raw and processed TOPAS subbottom profiler (SBP) dataset acquired during research voyage TAN2006 with R/V Tangaroa in 2020. Supplementary data for journal article investigating paleo-pockmarks using pseudo-3D sub-bottom profiler (SBP) data on the Chatham Rise, New Zealand. Warnke, F., Pecher, I. A., Strachan, L. J., Hillman, J. I. T., & Dugan, B. (2025). Cyclic Pockmark Formation Linked to Plio-Pleistocene Sea-Level Rise on the Chatham Rise, New Zealand. Geochemistry, Geophysics, Geosystems, 26(12), e2025GC012265. https://doi.org/10.1029/2025GC012265 Acquisition parameter Kongsberg Maritime TOPAS PS 18 Parametric Sub-Bottom Profiler Pulse form: Chirp (linear frequency-modulated)Chirp frequency: 2–6 kHzChirp length: 20 msSample rate: 40 kHzGain (receiver): 0 dBHigh-pass filter: 1 kHzHeave/Roll/Pitch stabilisation SEG-Y file metadata EBCDIC Text Header EncodingBig Endian byte orderSample Format: IEEE Float (32 bit)Sample Interval (uS) : 25 (raw), 50 (processed) Processing workflow The processing is applied using the "pseudo-3D-interpolation" workflow available on GitHub and archived via Zenodo. (if required) MERGED individual line parts CRS (projected): EPSG:32760 REPROJECT (bytes:73,77) (if required) DELRT FIX (if required) PAD DELRT STATIC CORRECTION:amp (byte:103) with SCALAR (byte:233) -> SEAFLOOR (byte:237) with SCALAR (byte:233) TIDE COMPENSATION MISTIE DESPIKE RESAMPLE (dt=0.05 ms) GAIN (tpow=1.5 scale=1e-0.5) ENVELOPE GAIN (linear=1,3) References Pecher, I., Hillman, J., Davy, B., Gorman, A. R., Woelz, S., Andrew, D., et al. (2022). “Geologic Champagne” voyage report R/V Tangaroa TAN2006: 26 June – 17 July 2020, Wellington–Wellington. (Cruise Report No. 2022/09) (p. 72). GNS Science. https://doi.org/10.21420/GT27-A456