Estimating a combined Moho model for marine areas via satellite altimetric - gravity and seismic crustal models
Abstract Isostasy is a key concept in geoscience in interpreting the state of mass balance between the Earth’s lithosphere and viscous asthenosphere. A more satisfactory test of isostasy is to determine the depth to and density contrast between crust and mantle at the Moho discontinuity (Moho). Gene...
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Springer Science and Business Media LLC
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crspringernat:10.1007/s11200-019-1067-0 2023-05-15T16:53:04+02:00 Estimating a combined Moho model for marine areas via satellite altimetric - gravity and seismic crustal models Abrehdary, Majid Sjöberg, Lars E. 2019 http://dx.doi.org/10.1007/s11200-019-1067-0 http://link.springer.com/content/pdf/10.1007/s11200-019-1067-0.pdf http://link.springer.com/article/10.1007/s11200-019-1067-0/fulltext.html en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Studia Geophysica et Geodaetica volume 64, issue 1, page 1-25 ISSN 0039-3169 1573-1626 Geochemistry and Petrology Geophysics journal-article 2019 crspringernat https://doi.org/10.1007/s11200-019-1067-0 2022-01-04T15:27:12Z Abstract Isostasy is a key concept in geoscience in interpreting the state of mass balance between the Earth’s lithosphere and viscous asthenosphere. A more satisfactory test of isostasy is to determine the depth to and density contrast between crust and mantle at the Moho discontinuity (Moho). Generally, the Moho can be mapped by seismic information, but the limited coverage of such data over large portions of the world (in particular at seas) and economic considerations make a combined gravimetric-seismic method a more realistic approach. The determination of a high-resolution of the Moho constituents for marine areas requires the combination of gravimetric and seismic data to diminish substantially the seismic data gaps. In this study, we estimate the Moho constituents globally for ocean regions to a resolution of 1 ° × 1° by applying the Vening Meinesz-Moritz method from gravimetric data and combine it with estimates derived from seismic data in a new model named COMHV19. The data files of GMG14 satellite altimetry-derived marine gravity field, the Earth2014 Earth topographic/bathymetric model, CRUST1.0 and CRUST19 crustal seismic models are used in a least-squares procedure. The numerical computations show that the Moho depths range from 7.3 km (in Kolbeinsey Ridge) to 52.6 km (in the Gulf of Bothnia) with a global average of 16.4 km and standard deviation of the order of 7.5 km. Estimated Moho density contrasts vary between 20 kg m -3 (north of Iceland) to 570 kg m -3 (in Baltic Sea), with a global average of 313.7 kg m -3 and standard deviation of the order of 77.4 kg m -3 . When comparing the computed Moho depths with current knowledge of crustal structure, they are generally found to be in good agreement with other crustal models. However, in certain regions, such as oceanic spreading ridges and hot spots, we generally obtain thinner crust than proposed by other models, which is likely the result of improvements in the new model. We also see evidence for thickening of oceanic crust with increasing age. Hence, the new combined Moho model is able to image rather reliable information in most of the oceanic areas, in particular in ocean ridges, which are important features in ocean basins. Article in Journal/Newspaper Iceland Kolbeinsey Springer Nature (via Crossref) Kolbeinsey ENVELOPE(-18.687,-18.687,67.149,67.149) Kolbeinsey Ridge ENVELOPE(-16.917,-16.917,68.833,68.833) Studia Geophysica et Geodaetica 64 1 1 25 |
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Springer Nature (via Crossref) |
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English |
topic |
Geochemistry and Petrology Geophysics |
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Geochemistry and Petrology Geophysics Abrehdary, Majid Sjöberg, Lars E. Estimating a combined Moho model for marine areas via satellite altimetric - gravity and seismic crustal models |
topic_facet |
Geochemistry and Petrology Geophysics |
description |
Abstract Isostasy is a key concept in geoscience in interpreting the state of mass balance between the Earth’s lithosphere and viscous asthenosphere. A more satisfactory test of isostasy is to determine the depth to and density contrast between crust and mantle at the Moho discontinuity (Moho). Generally, the Moho can be mapped by seismic information, but the limited coverage of such data over large portions of the world (in particular at seas) and economic considerations make a combined gravimetric-seismic method a more realistic approach. The determination of a high-resolution of the Moho constituents for marine areas requires the combination of gravimetric and seismic data to diminish substantially the seismic data gaps. In this study, we estimate the Moho constituents globally for ocean regions to a resolution of 1 ° × 1° by applying the Vening Meinesz-Moritz method from gravimetric data and combine it with estimates derived from seismic data in a new model named COMHV19. The data files of GMG14 satellite altimetry-derived marine gravity field, the Earth2014 Earth topographic/bathymetric model, CRUST1.0 and CRUST19 crustal seismic models are used in a least-squares procedure. The numerical computations show that the Moho depths range from 7.3 km (in Kolbeinsey Ridge) to 52.6 km (in the Gulf of Bothnia) with a global average of 16.4 km and standard deviation of the order of 7.5 km. Estimated Moho density contrasts vary between 20 kg m -3 (north of Iceland) to 570 kg m -3 (in Baltic Sea), with a global average of 313.7 kg m -3 and standard deviation of the order of 77.4 kg m -3 . When comparing the computed Moho depths with current knowledge of crustal structure, they are generally found to be in good agreement with other crustal models. However, in certain regions, such as oceanic spreading ridges and hot spots, we generally obtain thinner crust than proposed by other models, which is likely the result of improvements in the new model. We also see evidence for thickening of oceanic crust with increasing age. Hence, the new combined Moho model is able to image rather reliable information in most of the oceanic areas, in particular in ocean ridges, which are important features in ocean basins. |
format |
Article in Journal/Newspaper |
author |
Abrehdary, Majid Sjöberg, Lars E. |
author_facet |
Abrehdary, Majid Sjöberg, Lars E. |
author_sort |
Abrehdary, Majid |
title |
Estimating a combined Moho model for marine areas via satellite altimetric - gravity and seismic crustal models |
title_short |
Estimating a combined Moho model for marine areas via satellite altimetric - gravity and seismic crustal models |
title_full |
Estimating a combined Moho model for marine areas via satellite altimetric - gravity and seismic crustal models |
title_fullStr |
Estimating a combined Moho model for marine areas via satellite altimetric - gravity and seismic crustal models |
title_full_unstemmed |
Estimating a combined Moho model for marine areas via satellite altimetric - gravity and seismic crustal models |
title_sort |
estimating a combined moho model for marine areas via satellite altimetric - gravity and seismic crustal models |
publisher |
Springer Science and Business Media LLC |
publishDate |
2019 |
url |
http://dx.doi.org/10.1007/s11200-019-1067-0 http://link.springer.com/content/pdf/10.1007/s11200-019-1067-0.pdf http://link.springer.com/article/10.1007/s11200-019-1067-0/fulltext.html |
long_lat |
ENVELOPE(-18.687,-18.687,67.149,67.149) ENVELOPE(-16.917,-16.917,68.833,68.833) |
geographic |
Kolbeinsey Kolbeinsey Ridge |
geographic_facet |
Kolbeinsey Kolbeinsey Ridge |
genre |
Iceland Kolbeinsey |
genre_facet |
Iceland Kolbeinsey |
op_source |
Studia Geophysica et Geodaetica volume 64, issue 1, page 1-25 ISSN 0039-3169 1573-1626 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1007/s11200-019-1067-0 |
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64 |
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25 |
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1766043589604802560 |