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  A new global crust model: ECM22

Lu, B., van der Meijde, M., Fadel, I., Carlos Afonso, J., Reguzzoni, M., Rossi, L., Sampietro, D., Cammarano, F., Julia, J. (2023): A new global crust model: ECM22, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1846

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017737 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017737_2
Genre: Conference Paper

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 Creators:
Lu, Biao1, Author
van der Meijde, Mark1, Author
Fadel, Islam1, Author
Carlos Afonso, Juan1, Author
Reguzzoni, Mirko1, Author
Rossi, Lorenzo1, Author
Sampietro, Daniele1, Author
Cammarano, Fabio1, Author
Julia, Jordi1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Despite 160 years of probing the world crust, due to lack of seismic and ground gravity observations, there are still white spots in the worlds' crustal thickness map. The crustal structure in those regions is among the least understood of the Earth's continental areas, and variations in basic but fundamental parameters - such as crustal thickness - are still poorly constrained over large areas. Recent research has shown that satellite gravity-based crustal modeling in regions with limited seismological coverage can provide unique insights in crustal thickness and underlying geodynamical processes.<p>In almost all of these cases the gravity signal related to crustal structure is isolated by applying 3 different corrections: topography, sediments, and upper mantle structure.&nbsp;<p>Of these three, the upper mantle correction is least well addressed. It doesn’t account for any lateral inhomogeneity upper mantle composition close to the crust-mantle boundary. As a result, satellite gravity data reductions for upper mantle structure are a source of uncertainty.&nbsp;<p>Our new model includes a new state-of-the-art upper mantle correction. By combining satellite gravity and seismic tomography, we have formulated a new methodology to integrate potential field data inversions, tomographic modelling, and petrolophysics into a single inversion scheme. Our crustal thickness model ECM22 has therefore more accurate crustal thickness values, is seismically fitting better than previous models, and is now also consistent with gravity observations: up to a factor 85 times more accurate than e.g. CRUST1.0 and 4 times better than the GEMMA crustal model.&nbsp;

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-1846
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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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