Lithospheric structure beneath the ultra-slow spreading Knipovich ridge using noise reduced OBS P-wave Receiver functions
Ultra-slow spreading ridges are characterized by huge volcanic complexes which are separated by up to 150 km long amagmatic segments. The mechanisms controlling these types of mid-oceanic ridges (MOR) are not yet fully understood. We aim to constrain the crustal and mantle structure beneath a segmen...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5017944 2023-10-09T21:52:03+02:00 Lithospheric structure beneath the ultra-slow spreading Knipovich ridge using noise reduced OBS P-wave Receiver functions Rein, T. Zahra, Z. Frank, K. Vera, S. 2023 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017944 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-1638 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017944 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-1638 2023-09-10T23:43:22Z Ultra-slow spreading ridges are characterized by huge volcanic complexes which are separated by up to 150 km long amagmatic segments. The mechanisms controlling these types of mid-oceanic ridges (MOR) are not yet fully understood. We aim to constrain the crustal and mantle structure beneath a segment of the Knipovich ridge (Greenland Sea) by using Receiver functions calculated from teleseismic events. Seismic data, recorded on the ocean bottom, are highly contaminated by different noise sources. Results of our noise reduction algorithm based on harmonic-percussive separation (HPS) techniques of selected KNIPAS station data show a significantly reduced noise level on all three seismometer components (below 1 Hz). Improving the SNR on OBS records reveals the superposition of water and sediment reverberations on the crustal structure information, the latter is strongly hindering the structure interpretation. Here, we compare the real data with a set of synthetic Receiver functions for better analysis of the lithospheric structure. The results of the real data stacks reveal two discontinuities beneath the ridge shoulders: (i) at depths of around 8 km, which can be most likely associated with a Moho, (ii) at depths of around 30 km, which can be linked with the lithosphere- asthenosphere boundary. The center of the MOR and the Logachev seamount are characterized by a strong low-velocity zone at depths of up to 20 km. Comparing the depths of the mantle transition zone discontinuities from KNIPAS data and land station data indicates a low velocity layer east of the Knipovich ridge in the uppermost mantle. Conference Object Greenland Greenland Sea GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Greenland Knipovich Ridge ENVELOPE(7.074,7.074,75.712,75.712) |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
Ultra-slow spreading ridges are characterized by huge volcanic complexes which are separated by up to 150 km long amagmatic segments. The mechanisms controlling these types of mid-oceanic ridges (MOR) are not yet fully understood. We aim to constrain the crustal and mantle structure beneath a segment of the Knipovich ridge (Greenland Sea) by using Receiver functions calculated from teleseismic events. Seismic data, recorded on the ocean bottom, are highly contaminated by different noise sources. Results of our noise reduction algorithm based on harmonic-percussive separation (HPS) techniques of selected KNIPAS station data show a significantly reduced noise level on all three seismometer components (below 1 Hz). Improving the SNR on OBS records reveals the superposition of water and sediment reverberations on the crustal structure information, the latter is strongly hindering the structure interpretation. Here, we compare the real data with a set of synthetic Receiver functions for better analysis of the lithospheric structure. The results of the real data stacks reveal two discontinuities beneath the ridge shoulders: (i) at depths of around 8 km, which can be most likely associated with a Moho, (ii) at depths of around 30 km, which can be linked with the lithosphere- asthenosphere boundary. The center of the MOR and the Logachev seamount are characterized by a strong low-velocity zone at depths of up to 20 km. Comparing the depths of the mantle transition zone discontinuities from KNIPAS data and land station data indicates a low velocity layer east of the Knipovich ridge in the uppermost mantle. |
format |
Conference Object |
author |
Rein, T. Zahra, Z. Frank, K. Vera, S. |
spellingShingle |
Rein, T. Zahra, Z. Frank, K. Vera, S. Lithospheric structure beneath the ultra-slow spreading Knipovich ridge using noise reduced OBS P-wave Receiver functions |
author_facet |
Rein, T. Zahra, Z. Frank, K. Vera, S. |
author_sort |
Rein, T. |
title |
Lithospheric structure beneath the ultra-slow spreading Knipovich ridge using noise reduced OBS P-wave Receiver functions |
title_short |
Lithospheric structure beneath the ultra-slow spreading Knipovich ridge using noise reduced OBS P-wave Receiver functions |
title_full |
Lithospheric structure beneath the ultra-slow spreading Knipovich ridge using noise reduced OBS P-wave Receiver functions |
title_fullStr |
Lithospheric structure beneath the ultra-slow spreading Knipovich ridge using noise reduced OBS P-wave Receiver functions |
title_full_unstemmed |
Lithospheric structure beneath the ultra-slow spreading Knipovich ridge using noise reduced OBS P-wave Receiver functions |
title_sort |
lithospheric structure beneath the ultra-slow spreading knipovich ridge using noise reduced obs p-wave receiver functions |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017944 |
long_lat |
ENVELOPE(7.074,7.074,75.712,75.712) |
geographic |
Greenland Knipovich Ridge |
geographic_facet |
Greenland Knipovich Ridge |
genre |
Greenland Greenland Sea |
genre_facet |
Greenland Greenland Sea |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-1638 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017944 |
op_doi |
https://doi.org/10.57757/IUGG23-1638 |
_version_ |
1779315176867102720 |