The Storfjorden, Svalbard, earthquake sequence 2008-2020: Transtensional tectonics in an arctic intraplate region
An earthquake sequence in the Storfjorden offshore area southwest of Spitsbergen in the Svalbard archipelago initiated with a 21 February 2008 magnitude M w 6.1 event. This area had previously not produced any significant earthquakes, but between 2008 and 2020, a total of ∼ 2800 earthquakes were det...
Published in: | Seismological Research Letters |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
GeoScienceWorld
2021
|
Subjects: | |
Online Access: | https://hdl.handle.net/10037/22994 https://doi.org/10.1785/0220210022 |
id |
ftunivtroemsoe:oai:munin.uit.no:10037/22994 |
---|---|
record_format |
openpolar |
spelling |
ftunivtroemsoe:oai:munin.uit.no:10037/22994 2023-05-15T14:24:37+02:00 The Storfjorden, Svalbard, earthquake sequence 2008-2020: Transtensional tectonics in an arctic intraplate region Ottemöller, Lars Kim, Won-Young Waldhauser, Felix Tjåland, Norunn Dallmann, Winfried 2021-05-12 https://hdl.handle.net/10037/22994 https://doi.org/10.1785/0220210022 eng eng GeoScienceWorld Seismological Research Letters Ottemöller, Kim, Waldhauser, Tjåland, Dallmann W. The storfjorden, svalbard, earthquake sequence 2008-2020: Transtensional tectonics in an arctic intraplate region. Seismological Research Letters. 2021;92(5):2838-2849 FRIDAID 1939362 doi:10.1785/0220210022 1938-2057 https://hdl.handle.net/10037/22994 embargoedAccess © Seismological Society of America VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Journal article Tidsskriftartikkel Peer reviewed acceptedVersion 2021 ftunivtroemsoe https://doi.org/10.1785/0220210022 2021-11-17T23:54:38Z An earthquake sequence in the Storfjorden offshore area southwest of Spitsbergen in the Svalbard archipelago initiated with a 21 February 2008 magnitude M w 6.1 event. This area had previously not produced any significant earthquakes, but between 2008 and 2020, a total of ∼ 2800 earthquakes were detected, with ∼ 16 of them being of moderate size ( M L ≥ 4.0 ). Applying double‐difference relocation to improve relative locations reveals that the activity is linked to several subparallel faults striking southwest–northeast that extend across the entire crust. The southwest–northeast trend is also found as a possible fault plane from regional moment tensor inversion. The solutions range from oblique normal in the center of the cluster to pure strike slip farther away and are consistent with the compressional σ 1 axis roughly in the east–west direction and plunging 57°, and the extensional σ 3 axis subhorizontal trending north–south. The mainshock fault is steeply dipping to the southeast, but several other faults appear to be near vertical. The existence of oblique, right‐lateral strike‐slip motion on southwest–northeast‐trending faults with a normal component and pure normal faulting events in between suggests transtensional tectonics that in and around Storfjorden result in activation of a complex fault system. Article in Journal/Newspaper Arctic Arctic Storfjorden Svalbard Spitsbergen University of Tromsø: Munin Open Research Archive Arctic Svalbard Svalbard Archipelago Seismological Research Letters 92 5 2838 2849 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Ottemöller, Lars Kim, Won-Young Waldhauser, Felix Tjåland, Norunn Dallmann, Winfried The Storfjorden, Svalbard, earthquake sequence 2008-2020: Transtensional tectonics in an arctic intraplate region |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
description |
An earthquake sequence in the Storfjorden offshore area southwest of Spitsbergen in the Svalbard archipelago initiated with a 21 February 2008 magnitude M w 6.1 event. This area had previously not produced any significant earthquakes, but between 2008 and 2020, a total of ∼ 2800 earthquakes were detected, with ∼ 16 of them being of moderate size ( M L ≥ 4.0 ). Applying double‐difference relocation to improve relative locations reveals that the activity is linked to several subparallel faults striking southwest–northeast that extend across the entire crust. The southwest–northeast trend is also found as a possible fault plane from regional moment tensor inversion. The solutions range from oblique normal in the center of the cluster to pure strike slip farther away and are consistent with the compressional σ 1 axis roughly in the east–west direction and plunging 57°, and the extensional σ 3 axis subhorizontal trending north–south. The mainshock fault is steeply dipping to the southeast, but several other faults appear to be near vertical. The existence of oblique, right‐lateral strike‐slip motion on southwest–northeast‐trending faults with a normal component and pure normal faulting events in between suggests transtensional tectonics that in and around Storfjorden result in activation of a complex fault system. |
format |
Article in Journal/Newspaper |
author |
Ottemöller, Lars Kim, Won-Young Waldhauser, Felix Tjåland, Norunn Dallmann, Winfried |
author_facet |
Ottemöller, Lars Kim, Won-Young Waldhauser, Felix Tjåland, Norunn Dallmann, Winfried |
author_sort |
Ottemöller, Lars |
title |
The Storfjorden, Svalbard, earthquake sequence 2008-2020: Transtensional tectonics in an arctic intraplate region |
title_short |
The Storfjorden, Svalbard, earthquake sequence 2008-2020: Transtensional tectonics in an arctic intraplate region |
title_full |
The Storfjorden, Svalbard, earthquake sequence 2008-2020: Transtensional tectonics in an arctic intraplate region |
title_fullStr |
The Storfjorden, Svalbard, earthquake sequence 2008-2020: Transtensional tectonics in an arctic intraplate region |
title_full_unstemmed |
The Storfjorden, Svalbard, earthquake sequence 2008-2020: Transtensional tectonics in an arctic intraplate region |
title_sort |
storfjorden, svalbard, earthquake sequence 2008-2020: transtensional tectonics in an arctic intraplate region |
publisher |
GeoScienceWorld |
publishDate |
2021 |
url |
https://hdl.handle.net/10037/22994 https://doi.org/10.1785/0220210022 |
geographic |
Arctic Svalbard Svalbard Archipelago |
geographic_facet |
Arctic Svalbard Svalbard Archipelago |
genre |
Arctic Arctic Storfjorden Svalbard Spitsbergen |
genre_facet |
Arctic Arctic Storfjorden Svalbard Spitsbergen |
op_relation |
Seismological Research Letters Ottemöller, Kim, Waldhauser, Tjåland, Dallmann W. The storfjorden, svalbard, earthquake sequence 2008-2020: Transtensional tectonics in an arctic intraplate region. Seismological Research Letters. 2021;92(5):2838-2849 FRIDAID 1939362 doi:10.1785/0220210022 1938-2057 https://hdl.handle.net/10037/22994 |
op_rights |
embargoedAccess © Seismological Society of America |
op_doi |
https://doi.org/10.1785/0220210022 |
container_title |
Seismological Research Letters |
container_volume |
92 |
container_issue |
5 |
container_start_page |
2838 |
op_container_end_page |
2849 |
_version_ |
1766297046429466624 |