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Seismic Profiles from Port Foster, Deception Island (Antarctica)
Deception Island (South Shetland Islands, Antarctica) consist of a horseshoe-shaped volcanic edifice, which evolution is marked by the formation of a collapse caldera. It is the most active volcano in the South Shetland archipelago with more than 20 eruptions in the past two centuries. In order to improve our knowledge about Deception Island, a total of 12 parametric seismic profiles were obtained from the island’s interior bay (Port Foster) during the 2017/2018 Spanish Antarctic Campaign and the Antarctic GALILEO-IHM cruise aboard the R/V Hespérides (2017 / 2018) with a hull-mounted TOPAS PS 018 high-resolution parametric sounder designed for sub-bottom profiling with very high spatial resolution in water depths from less than 20 meters to full ocean depth.
TOPAS, Seismic Profiles, Port Foster, South Shetland Islands, Deception Island, Antarctica
-62.88N, -63.02S, -60.47E, -60.78W
Parametric seismic profiles were obtained with a hull-mounted TOPAS PS 018 high-resolution parametric sounder designed for sub-bottom profiling with very high spatial resolution in water depths from less than 20 meters to full ocean depth. The +80% relative bandwidth, low frequency signal is generated in the water column by non-linear interaction between two high frequency signals (centered symmetrically around 18 kHz). The seismic profiles obtained were recorded working in high-penetration mode, by transmission of a Chirp wave (LFM), trying at all times not to interfere with the EM122 multibeam echosounder signal. Normal transmission frequencies vary from 2.0 kHz for the initial and 5 kHz for the final, with a pulse length of 10 ms, and transmitted at a 1,500 ms internal mode trigger interval. The record length was 400 ms at a sampling rate of 16.0 Hz. The deconvolution and initial 2 kHz filtering (HP filter) of the signal have always been applied in this Chirp mode. The TVG ramps normally used during the acquisition have been 0.78 d/ms between the bottom and 5.4 ms depth, 0.77 d/ms between 5.4 and 25.9 ms, and 0.14 d/ms after 35.6 ms.
Seismic profiles in SEGY format
|474 Mo||SEGY||Processed data|