Marine Geoscience Data System
WT10148 Seismic Reflection/Refraction
Seismic:Reflection:MCS
Processed time-stacked data (SEG-Y format) for 2-75 Ma equatorial Atlantic ocean floor acquired in 2015 as part of the TransAtlanticILAB project
These final processed two-way time seismic stack sections are part of a seismic investigation of the Lithosphere-Asthenosphere Boundary (LAB) for the African plate in the equatorial Atlantic ocean from 2-75 Ma. The data is cited in Audhkhasi and Singh. (2022). The files are in SEG-Y format and were generated from data acquired in individual sequences starting from 75 Ma (eastern most) to 2 Ma (western most) using a 12-km long Isometrix streamer. The final processed stacked data is split into four SEG-Y files covering 2-27Ma, 27-47Ma, 47-49Ma, and 49-75 Ma respectively. These individual segments were merged to give a ~1400 km continuous line from 2-75 Ma. The file named stack_2_27Ma.segy and the associated image stack_2_27Ma.pdf correspond to Figure S17 of Audhkhasi and Singh (2022) and span the profile ~450 km West-East from point A (2 Ma) to point B (27 Ma) as shown in Figure 1 of Audhkhasi and Singh (2022). The file named stack_27_47Ma.segy and the associated image stack_27_47Ma.pdf correspond to Figure S18 of Audhkhasi and Singh (2022) and span the profile ~450 km West-East from point B (27 Ma) to point C (47 Ma). The file named stack_47_49Ma.segy spans the profile ~100 km North-South from point C (47 Ma) to point D (49 Ma), and the file named stack_49_75Ma.segy spans the profile ~400 km West-East from point D (49 Ma) to point E (75 Ma). The files stack_47_49Ma.segy and stack_49_75Ma.segy have been merged into a single image stack_47_75Ma.pdf, with the turning point of the ship, point D (49 Ma), marked by a vertical black line. The combined files also correspond to Figure S19 of Audhkhasi and Singh (2022). Figure 2 of main article of Audhkhasi and Singh, 2022, has all the files displayed as a single image whereas the supplementary information displays them individually. Processing of the MCS data focused on deeper Earth reflections, particularly the Lithosphere-Asthenosphere Boundary (LAB), and is described in the Materials and Methods and the supplementary figures S3-S15 of Audhkhasi and Singh (2022). Final processed data files (SEG-Y format) in two-way time are made available here along with their associated images. This study was carried out from March-April 2015 and is funded by the ERC Advance Grant agreement No. 339442 TransAtlanticILAB.
Device Info
Seismic:MCS
Platform
Western Trident
WesternGeco
Quality
2
The data have been processed/modified to a level beyond that of basic quality control (e.g. final processed sonar data, photo-mosaics).

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