Multibeam data passed preliminary filtering steps, with the contribution of Marco Ligi. Now they are being processed by the IFREMER's CARAIBES Software. The EM300 and EM3000 DTMs were joined to waterdepths of 120m. We expect to produce DTMs at the resolution of 1m or even less (EM3000) in some particular areas, to be used for ultra accurate coring and ROV inspections.
SBP data were converted to SEG-Y by Triton's software and processed at IGM by the IGM's SEISPRO software (Fig.30, courtesy of and work done by Luca Gasperini).
The main steps of the processing sequence are summarized in Fig. 31. The raw data (A) are affected by random noise, mainly due to mechanical vibrations of the tow cable. In addition, the profile needs to be corrected for the position of the tow-fish. The central panel (B) (bottom) shows this geometrical correction, recovering the positions to the sea-level datum. This was obtained either automatically from the navigation files, or manually, by digitizing the track of the tow-fish from the raw section. Panel (C) shows the section after filtering and muting. Having noted that Band-Pass filtering was not effective due to the overlap between signal and noise bands, a new filter with a trace-like algorithm was designed.
For each core x-ray investigations were carried out at IGM by G.Marozzi and at the S.Orsola Hospital. Magnetic susceptibility measurements (Fig.32) were made at IGM by Lucilla Capotondi with IGM's instrumentation (Luca Masini, personal communication). Then they were opened and sampled at 10cm interval for biostratigraphy. Foraminiferal content was identified in the dried sediment fraction > 63 micron. Samples were also taken for 14C AMS analyses.
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