Shear-wave Velocity Structure of Greenland from Rayleigh-wave Analysis
The elastic structure beneath Greenland is shown by means of S-velocity maps for depths ranging from zero to 350 km, determined by the regionalization and inversion of Rayleigh-wave dispersion. The traces of 50 earthquakes, occurring from 1990 to 2011, have been used to obtain Rayleigh-wave dispersi...
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Universidad Nacional de Colombia
2016
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ftdoajarticles:oai:doaj.org/article:78a4d62119e54b139b80285c39a721d0 2023-05-15T16:27:06+02:00 Shear-wave Velocity Structure of Greenland from Rayleigh-wave Analysis V. Corchete 2016-01-01T00:00:00Z https://doi.org/10.15446/esrj.v20n1.41079 https://doaj.org/article/78a4d62119e54b139b80285c39a721d0 EN eng Universidad Nacional de Colombia https://revistas.unal.edu.co/index.php/esrj/article/view/41079 https://doaj.org/toc/1794-6190 https://doaj.org/toc/2339-3459 1794-6190 2339-3459 doi:10.15446/esrj.v20n1.41079 https://doaj.org/article/78a4d62119e54b139b80285c39a721d0 Earth Sciences Research Journal, Vol 20, Iss 1 (2016) Rayleigh wave Shear wave crust upper mantle Greenland Geology QE1-996.5 article 2016 ftdoajarticles https://doi.org/10.15446/esrj.v20n1.41079 2023-01-08T01:39:00Z The elastic structure beneath Greenland is shown by means of S-velocity maps for depths ranging from zero to 350 km, determined by the regionalization and inversion of Rayleigh-wave dispersion. The traces of 50 earthquakes, occurring from 1990 to 2011, have been used to obtain Rayleigh-wave dispersion data. These earthquakes were registered by 21 seismic station located in Greenland and the surrounding area. The dispersion curves were obtained for periods between 5 and 200 s, by digital filtering with a combination of MFT (Multiple Filter Technique) and TVF (Time Variable Filtering). Later, all seismic events (and some stations) were grouped to obtain a dispersion curve for each source-station path. These dispersion curves were regionalized and inverted according to the generalized inversion theory, to obtain shear-wave velocity models for a rectangular grid of 16x20 points. The shear-velocity structure obtained through this procedure is shown in the S-velocity maps plotted for several depths. These results agree well with the geology and other geophysical results previously obtained. The obtained S-velocity models suggest the existence of lateral and vertical heterogeneity. The zones with consolidated and old structures present greater S-velocity values than the other zones, although this difference can be very little or negligible in some case. Nevertheless, in the depth range of 15 to 45 km, the different Moho depths present in the study area generate the principal variation of S-velocity. A similar behaviour is found for the depth range from 80 to 230 km, in which the lithosphere-asthenosphere boundary (LAB) generates the principal variations of S-velocity. Finally, the new and interesting feature obtained in this study: the definition of the base of the asthenosphere (for the whole study area and for depths ranging from 130 to 280 km, respectively) should be highlighted. Estructura de velocidad de cizalla de Groenlandia obtenida de análisis de onda Rayleigh Resumen La estructura elástica bajo Groenlandia es ... Article in Journal/Newspaper Greenland Groenlandia Directory of Open Access Journals: DOAJ Articles Greenland Earth Sciences Research Journal 20 1 1 11 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
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language |
English |
topic |
Rayleigh wave Shear wave crust upper mantle Greenland Geology QE1-996.5 |
spellingShingle |
Rayleigh wave Shear wave crust upper mantle Greenland Geology QE1-996.5 V. Corchete Shear-wave Velocity Structure of Greenland from Rayleigh-wave Analysis |
topic_facet |
Rayleigh wave Shear wave crust upper mantle Greenland Geology QE1-996.5 |
description |
The elastic structure beneath Greenland is shown by means of S-velocity maps for depths ranging from zero to 350 km, determined by the regionalization and inversion of Rayleigh-wave dispersion. The traces of 50 earthquakes, occurring from 1990 to 2011, have been used to obtain Rayleigh-wave dispersion data. These earthquakes were registered by 21 seismic station located in Greenland and the surrounding area. The dispersion curves were obtained for periods between 5 and 200 s, by digital filtering with a combination of MFT (Multiple Filter Technique) and TVF (Time Variable Filtering). Later, all seismic events (and some stations) were grouped to obtain a dispersion curve for each source-station path. These dispersion curves were regionalized and inverted according to the generalized inversion theory, to obtain shear-wave velocity models for a rectangular grid of 16x20 points. The shear-velocity structure obtained through this procedure is shown in the S-velocity maps plotted for several depths. These results agree well with the geology and other geophysical results previously obtained. The obtained S-velocity models suggest the existence of lateral and vertical heterogeneity. The zones with consolidated and old structures present greater S-velocity values than the other zones, although this difference can be very little or negligible in some case. Nevertheless, in the depth range of 15 to 45 km, the different Moho depths present in the study area generate the principal variation of S-velocity. A similar behaviour is found for the depth range from 80 to 230 km, in which the lithosphere-asthenosphere boundary (LAB) generates the principal variations of S-velocity. Finally, the new and interesting feature obtained in this study: the definition of the base of the asthenosphere (for the whole study area and for depths ranging from 130 to 280 km, respectively) should be highlighted. Estructura de velocidad de cizalla de Groenlandia obtenida de análisis de onda Rayleigh Resumen La estructura elástica bajo Groenlandia es ... |
format |
Article in Journal/Newspaper |
author |
V. Corchete |
author_facet |
V. Corchete |
author_sort |
V. Corchete |
title |
Shear-wave Velocity Structure of Greenland from Rayleigh-wave Analysis |
title_short |
Shear-wave Velocity Structure of Greenland from Rayleigh-wave Analysis |
title_full |
Shear-wave Velocity Structure of Greenland from Rayleigh-wave Analysis |
title_fullStr |
Shear-wave Velocity Structure of Greenland from Rayleigh-wave Analysis |
title_full_unstemmed |
Shear-wave Velocity Structure of Greenland from Rayleigh-wave Analysis |
title_sort |
shear-wave velocity structure of greenland from rayleigh-wave analysis |
publisher |
Universidad Nacional de Colombia |
publishDate |
2016 |
url |
https://doi.org/10.15446/esrj.v20n1.41079 https://doaj.org/article/78a4d62119e54b139b80285c39a721d0 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Groenlandia |
genre_facet |
Greenland Groenlandia |
op_source |
Earth Sciences Research Journal, Vol 20, Iss 1 (2016) |
op_relation |
https://revistas.unal.edu.co/index.php/esrj/article/view/41079 https://doaj.org/toc/1794-6190 https://doaj.org/toc/2339-3459 1794-6190 2339-3459 doi:10.15446/esrj.v20n1.41079 https://doaj.org/article/78a4d62119e54b139b80285c39a721d0 |
op_doi |
https://doi.org/10.15446/esrj.v20n1.41079 |
container_title |
Earth Sciences Research Journal |
container_volume |
20 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
11 |
_version_ |
1766016155337621504 |