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

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

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021873 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021873_1
Genre: Conference Paper

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 Creators:
Li, Yuhan1, Author
Grevemeyer, Ingo1, Author
Henstock, Timothy J.1, Author
Robinson, Adam1, Author
Dannowski, Anke1, Author
Marjanovic, Milena1, Author
Hilbert, Helene-Sophie1, Author
Teagle, Damon A. H.1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 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).

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
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 Identifiers: DOI: 10.57757/IUGG23-4444
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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