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Oceanic crustal structure of the Guatemala Basin: Preliminary results from seismic tomography

Authors

Li,  Yuhan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Grevemeyer,  Ingo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Henstock,  Timothy J.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Robinson,  Adam
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Dannowski,  Anke
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Marjanovic,  Milena
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Hilbert,  Helene-Sophie
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Teagle,  Damon A. H.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Li, Y., Grevemeyer, I., Henstock, T. J., Robinson, A., Dannowski, A., Marjanovic, M., Hilbert, H.-S., Teagle, D. A. H. (2023): Oceanic crustal structure of the Guatemala Basin: Preliminary results from seismic tomography, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4444


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021873
Abstract
From December 2022 to January 2023, a geophysical survey of the RRS JAMES COOK in the Guatemala Basin collected two refraction and wide-angle seismic profiles, each with 11 Ocean-Bottom-Seismometers spaced at ~7.5 km intervals. Both two profiles have excellent data quality and recorded clear crustal refraction (Pg), upper mantle refraction (Pn), and very long-extended Moho reflection (PmP) phases. To utilize the data adequately, we use the layer-stripping top-down method to conduct joint refraction and reflection seismic tomography of these two profiles. The preliminary results show that the crustal thickness beneath line p300 is ~5 km, which is thinner than the global average thickness of the oceanic crust at ~6 km. This is in agreement with the result of down-hole logging and wide-angle seismic survey to the southwest at the ODP site 1256. In contrast, the seismic structure of profile p400, which is located to the northeast of profile p300, reveals ~6–7.5 km thick oceanic crust. Both two profiles present a high velocity gradient of oceanic layer 2 from ~4.5 km/s to ~6.5 km/s and a low velocity gradient of oceanic layer 3 from ~6.5 km/s to 7.2 km/s, which were interpreted as basaltic layer and gabbroic layer, respectively, showing typical oceanic structure. Our data present a very clear Moho reflection and our preliminary analyses suggest the area in the vicinity of line p300 fulfilled the requirements for future Moho drilling and thus may represent a site for the flagship drilling project MoHole of the International Ocean Discovery Program (IODP).