SEG-Y and CSV data extracted from reflection seismic profiles and exploration well of the ViDEPI project in the Taranto Valley area (Ionian Sea, Southern Italy)

Description

The outer slope of the Taranto Trench (Ionian Sea, Southern Italy) is characterised by gravitational instability features that present an hazard for the Apulian coastal zone. One of the most evident feature has been identified in the offshore Taranto (MaGIC project), with witness of a landslide that can be found in the vintage unmigrated staked seismic reflection profiles of the ViDEPI project database (www.videpi.com/videpi/videpi.asp). These represents the only freely available subsurface data in this zone, provided as low-quality raster images in PDF format, making interpretation challenging. To enable detailed investigation of this area through higher quality visual data, reflection seismic profiles F75-42, F75-44, F75-83, F75-85, D-482 and MT-457-85 were converted to SEG-Y format using the procedure reported by Cicala et al. (2024). In order to obtain these files, we first combined the raster images as PDF files and transformed them into TIFF format. Subsequently, these images, along with their related TXT files (containing rows of code with information such as trace length in pixels, seismic line number, marine or land position, SEG-Y revision format, SEG-Y numeric format, UTM zone, geographic coordinates, pixel position, delay or time over the datum, time interval of the seismic profile in milliseconds), were converted using the MATLAB© program IMAGE2SEGY (Farran, 2012). To further enhance the seismic image in SEG-Y format the final step involved removing the low frequency noise through the data processing in DELPH Seismic® software ambient. Specifically, a high-pass filter was applied to all the seismic reflection profiles with cutoff values ranging from 8 Hz and 18 Hz, while the low-pass filter was applied only to seismic reflection profile D-482, with a cutoff set to 113 Hz; the automatic gain control function was also enabled to enhance the signal quality. Moreover, to allow the correlation between the seismic signal and the stratigraphy, for future interpretation, the database includes also the digitalized sonic log of the exploration well Sansone-1 (geographic coordinates 40°24’02.55’’ N, 16°49’16.95’’ E), obtained from the raster image in PDF format (available in the ViDEPI project database) and converted in CSV file format. Following the procedure described by Cicala et al. (2023), the resulted file consists of 1033 pairs of data organised in two columns, A and B, representing interval transit time Δt [µs/ft] and depth [m], respectively. This digitalization, useful to define the seismic P-wave average velocity of the lithostratigraphic succession characterising the exploration well, is aimed to correlate the lithostratigraphic units with the seismic facies in the converted reflection seismic profiles.

Institutions

Categories

Funding

Licence