Included here are 3D post-stack time migrated data from the Kolumbo Volcano in the Aegean Sea. The data were collected aboard RV Poseidon in 2019 during Research Cruise POS538 using GEOMAR's P-Cable seismic system. Seismic source was a Generator-Injector airgun fired in harmonic mode with generator and injector volumes of 45 cubic inches. The source was towed at a nominal depth of 2 m beneath the sea surface. Shot interval was 4 seconds at a ship speed of ~3.5 knots. Gun pressure was set at 200 bar. The receiver geometry consisted of 16 streamer sections attached to a 199 m long cross cable. Processing included: 3D geometry application, trace editing, static time corrections, anomalous amplitude attenuation, FK filtering, pre-stack trace interpolation, adaptive subtraction multiple suppression using a 1D pattern matching algorithm, sorting to common midpoint gathers, normal moveout correction (1517 m/s constant velocity), stacking, trace interpolation, 3D FK coherency filtering, 3D Stolt migration (1517 m/s constant velocity), residual 2D finite difference migration (first inline, then crossline). The dataset has a horizontal resolution of 3.125 m (bin size) and a dominant frequency of ~100 Hz. Acquisition and processing details are included in the EBCDIC header of the SEG-Y file.

Information required for loading the data (Note: All information required for loading the data is also provided in the EBCDIC header of the SEG-Y file.):Data corners:Corner 1: Inline=1020, Crossline=1000, X=357858.86 m Y=4047575.34 mCorner 2: Inline=1020, Crossline=5210, X=367161.74 m Y=4038272.47 mCorner 3: Inline=1954, Crossline=1000, X=359922.73 m Y=4049639.21 mCorner 4: Inline=1020, Crossline=5210, X=369225.61 m Y=4040336.34 mCoordinate system: WGS 84 UTM zone 35N: EPSG 32635Inline and Crossline headers: Bytes 189-192 (inlines) and 193-196 (crosslines)Coordinate headers: Bytes 181-184 (X coord) and Bytes 185-188 (Y coord). Coordinates in centimetres (COORD_SCALE = -100)Trace length=1500 ms, Sample rate=1 ms, Total traces=3937285 (935 inlines x 4211 xlines)