The Moho Architecture and Its Role for Isostasy—Insights From the Lofoten-Vesterålen Rifted Margin, Norway
The crustal structure of the Nordland and Troms region, Norway, has received growing scientific attention because (a) the region is one of the most seismically active areas of mainland Norway, and (b) there are differing interpretations of the crustal structure but none of the proposed models simult...
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Online Access: | https://hdl.handle.net/11250/3072865 https://doi.org/10.1029/2022JB025983 |
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ftunivbergen:oai:bora.uib.no:11250/3072865 2023-07-16T03:59:27+02:00 The Moho Architecture and Its Role for Isostasy—Insights From the Lofoten-Vesterålen Rifted Margin, Norway Schiffer, Christian Rondenay, Stephane Ottemöller, Lars Drottning, Anne Furubotten 2023 application/pdf https://hdl.handle.net/11250/3072865 https://doi.org/10.1029/2022JB025983 eng eng American Geophysical Union urn:issn:2169-9313 https://hdl.handle.net/11250/3072865 https://doi.org/10.1029/2022JB025983 cristin:2154251 Journal of Geophysical Research (JGR): Solid Earth. 2023, 128 (5), e2022JB025983. Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2023 the authors e2022JB025983 Journal of Geophysical Research (JGR): Solid Earth 128 5 Journal article Peer reviewed 2023 ftunivbergen https://doi.org/10.1029/2022JB025983 2023-06-28T23:07:07Z The crustal structure of the Nordland and Troms region, Norway, has received growing scientific attention because (a) the region is one of the most seismically active areas of mainland Norway, and (b) there are differing interpretations of the crustal structure but none of the proposed models simultaneously satisfy gravity, topography and crustal isostasy. At the core of the puzzle is the Lofoten-Vesterålen archipelago, which exhibits considerable variations in crustal thickness, seemingly inconsistent with the topographic expression along this geomorphic structure. The prevalent view has been that the crust beneath the southern Lofoten is extremely thin (∼20 km). This has recently been disputed. Here, we address this debate by producing new lithospheric models in the region from joint inversion of receiver functions and P-wave polarizations at 62 seismic stations. Our results are consistent with the regional trends from other models, including a shallow Moho in the southern Lofoten. Moreover, our results detect a low-velocity layer in the uppermost mantle, which appears to be highly relevant to isostasy in the region. We conclude that the crustal structure in the region may not be as controversial as the recent debate suggested. What appears more urgent to understand is how the concept of isostasy is defined, and how it relates to the layered structure of the lithosphere. In particular, our findings emphasize the importance of conceptualizing the Moho as a transition zone with considerable thickness and internal structural variations, rather than a simple velocity discontinuity. publishedVersion Article in Journal/Newspaper Lofoten Nordland Nordland Vesterålen Nordland Troms University of Bergen: Bergen Open Research Archive (BORA-UiB) Lofoten Norway Vesterålen ENVELOPE(14.939,14.939,68.754,68.754) Journal of Geophysical Research: Solid Earth 128 5 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
The crustal structure of the Nordland and Troms region, Norway, has received growing scientific attention because (a) the region is one of the most seismically active areas of mainland Norway, and (b) there are differing interpretations of the crustal structure but none of the proposed models simultaneously satisfy gravity, topography and crustal isostasy. At the core of the puzzle is the Lofoten-Vesterålen archipelago, which exhibits considerable variations in crustal thickness, seemingly inconsistent with the topographic expression along this geomorphic structure. The prevalent view has been that the crust beneath the southern Lofoten is extremely thin (∼20 km). This has recently been disputed. Here, we address this debate by producing new lithospheric models in the region from joint inversion of receiver functions and P-wave polarizations at 62 seismic stations. Our results are consistent with the regional trends from other models, including a shallow Moho in the southern Lofoten. Moreover, our results detect a low-velocity layer in the uppermost mantle, which appears to be highly relevant to isostasy in the region. We conclude that the crustal structure in the region may not be as controversial as the recent debate suggested. What appears more urgent to understand is how the concept of isostasy is defined, and how it relates to the layered structure of the lithosphere. In particular, our findings emphasize the importance of conceptualizing the Moho as a transition zone with considerable thickness and internal structural variations, rather than a simple velocity discontinuity. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Schiffer, Christian Rondenay, Stephane Ottemöller, Lars Drottning, Anne Furubotten |
spellingShingle |
Schiffer, Christian Rondenay, Stephane Ottemöller, Lars Drottning, Anne Furubotten The Moho Architecture and Its Role for Isostasy—Insights From the Lofoten-Vesterålen Rifted Margin, Norway |
author_facet |
Schiffer, Christian Rondenay, Stephane Ottemöller, Lars Drottning, Anne Furubotten |
author_sort |
Schiffer, Christian |
title |
The Moho Architecture and Its Role for Isostasy—Insights From the Lofoten-Vesterålen Rifted Margin, Norway |
title_short |
The Moho Architecture and Its Role for Isostasy—Insights From the Lofoten-Vesterålen Rifted Margin, Norway |
title_full |
The Moho Architecture and Its Role for Isostasy—Insights From the Lofoten-Vesterålen Rifted Margin, Norway |
title_fullStr |
The Moho Architecture and Its Role for Isostasy—Insights From the Lofoten-Vesterålen Rifted Margin, Norway |
title_full_unstemmed |
The Moho Architecture and Its Role for Isostasy—Insights From the Lofoten-Vesterålen Rifted Margin, Norway |
title_sort |
moho architecture and its role for isostasy—insights from the lofoten-vesterålen rifted margin, norway |
publisher |
American Geophysical Union |
publishDate |
2023 |
url |
https://hdl.handle.net/11250/3072865 https://doi.org/10.1029/2022JB025983 |
long_lat |
ENVELOPE(14.939,14.939,68.754,68.754) |
geographic |
Lofoten Norway Vesterålen |
geographic_facet |
Lofoten Norway Vesterålen |
genre |
Lofoten Nordland Nordland Vesterålen Nordland Troms |
genre_facet |
Lofoten Nordland Nordland Vesterålen Nordland Troms |
op_source |
e2022JB025983 Journal of Geophysical Research (JGR): Solid Earth 128 5 |
op_relation |
urn:issn:2169-9313 https://hdl.handle.net/11250/3072865 https://doi.org/10.1029/2022JB025983 cristin:2154251 Journal of Geophysical Research (JGR): Solid Earth. 2023, 128 (5), e2022JB025983. |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2023 the authors |
op_doi |
https://doi.org/10.1029/2022JB025983 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
128 |
container_issue |
5 |
_version_ |
1771547193141886976 |