Knipovich Ridge’s Logachev volcanic centre: insights into volcanic activity from seismic tomography
Ultraslow spreading ridges represent the slowest divergent plate boundaries on Earth. Distinct spreading processes along ultraslow spreading ridges build magmatic segments that are volcanically active in between amagmatic segments that exhibit mantle rocks at the seafloor. Our local seismicity study...
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ftawi:oai:epic.awi.de:54935 2024-09-15T18:10:01+00:00 Knipovich Ridge’s Logachev volcanic centre: insights into volcanic activity from seismic tomography Meier, Michaela Schlindwein, Vera 2021 https://epic.awi.de/id/eprint/54935/ https://hdl.handle.net/10013/epic.5938af52-63f2-498a-bf7b-f00ed0581264 unknown Meier, M. orcid:0000-0002-5491-2609 and Schlindwein, V. orcid:0000-0001-5570-2753 (2021) Knipovich Ridge’s Logachev volcanic centre: insights into volcanic activity from seismic tomography , 37th General Assembly of the European Seismological Commission, Corfu, Greece, 19 September 2021 - 24 September 2021 . hdl:10013/epic.5938af52-63f2-498a-bf7b-f00ed0581264 EPIC337th General Assembly of the European Seismological Commission, Corfu, Greece, 2021-09-19-2021-09-24 Conference notRev 2021 ftawi 2024-06-24T04:27:29Z Ultraslow spreading ridges represent the slowest divergent plate boundaries on Earth. Distinct spreading processes along ultraslow spreading ridges build magmatic segments that are volcanically active in between amagmatic segments that exhibit mantle rocks at the seafloor. Our local seismicity study along the ultraslow spreading Knipovich Ridge in the Greenland Sea gives insights into spreading processes of an entire ridge segment. The more than 8000 reliably located events exhibited an undulating brittle-ductile boundary shallowing towards the Logachev volcanic centre in the centre of the study area. Here, we observe a gap, where seismicity is absent apart from two earthquake swarms. Together with numerous earthquake swarms north of the seismicity gap, this indicates current activity of the volcanic centre. To further investigate the Logachev volcanic centre and its activity we perform a local earthquake tomography. The relevant part of the network of ocean bottom seismometers consisted of 14 stations, spaced by 10-20 km, deployed for one year approximately 60 km along the Knipovich Ridge. The tomography revealed a low velocity area underneath the Logachev volcanic centre at a depth of 10-12 km. This anomaly is robust when using different parameter sets and tomography algorithms. Together with the earthquake swarms and the presence of fresh basalts on the seafloor, this low velocity area could represent a magma chamber feeding the Logachev volcanic centre. From the magma chamber dikes rise to the surface thereby producing swarm activity and heating the surrounding area. The heated area does not allow background seismicity and thereby shows up as a seismicity gap. Conference Object Greenland Greenland Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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description |
Ultraslow spreading ridges represent the slowest divergent plate boundaries on Earth. Distinct spreading processes along ultraslow spreading ridges build magmatic segments that are volcanically active in between amagmatic segments that exhibit mantle rocks at the seafloor. Our local seismicity study along the ultraslow spreading Knipovich Ridge in the Greenland Sea gives insights into spreading processes of an entire ridge segment. The more than 8000 reliably located events exhibited an undulating brittle-ductile boundary shallowing towards the Logachev volcanic centre in the centre of the study area. Here, we observe a gap, where seismicity is absent apart from two earthquake swarms. Together with numerous earthquake swarms north of the seismicity gap, this indicates current activity of the volcanic centre. To further investigate the Logachev volcanic centre and its activity we perform a local earthquake tomography. The relevant part of the network of ocean bottom seismometers consisted of 14 stations, spaced by 10-20 km, deployed for one year approximately 60 km along the Knipovich Ridge. The tomography revealed a low velocity area underneath the Logachev volcanic centre at a depth of 10-12 km. This anomaly is robust when using different parameter sets and tomography algorithms. Together with the earthquake swarms and the presence of fresh basalts on the seafloor, this low velocity area could represent a magma chamber feeding the Logachev volcanic centre. From the magma chamber dikes rise to the surface thereby producing swarm activity and heating the surrounding area. The heated area does not allow background seismicity and thereby shows up as a seismicity gap. |
format |
Conference Object |
author |
Meier, Michaela Schlindwein, Vera |
spellingShingle |
Meier, Michaela Schlindwein, Vera Knipovich Ridge’s Logachev volcanic centre: insights into volcanic activity from seismic tomography |
author_facet |
Meier, Michaela Schlindwein, Vera |
author_sort |
Meier, Michaela |
title |
Knipovich Ridge’s Logachev volcanic centre: insights into volcanic activity from seismic tomography |
title_short |
Knipovich Ridge’s Logachev volcanic centre: insights into volcanic activity from seismic tomography |
title_full |
Knipovich Ridge’s Logachev volcanic centre: insights into volcanic activity from seismic tomography |
title_fullStr |
Knipovich Ridge’s Logachev volcanic centre: insights into volcanic activity from seismic tomography |
title_full_unstemmed |
Knipovich Ridge’s Logachev volcanic centre: insights into volcanic activity from seismic tomography |
title_sort |
knipovich ridge’s logachev volcanic centre: insights into volcanic activity from seismic tomography |
publishDate |
2021 |
url |
https://epic.awi.de/id/eprint/54935/ https://hdl.handle.net/10013/epic.5938af52-63f2-498a-bf7b-f00ed0581264 |
genre |
Greenland Greenland Sea |
genre_facet |
Greenland Greenland Sea |
op_source |
EPIC337th General Assembly of the European Seismological Commission, Corfu, Greece, 2021-09-19-2021-09-24 |
op_relation |
Meier, M. orcid:0000-0002-5491-2609 and Schlindwein, V. orcid:0000-0001-5570-2753 (2021) Knipovich Ridge’s Logachev volcanic centre: insights into volcanic activity from seismic tomography , 37th General Assembly of the European Seismological Commission, Corfu, Greece, 19 September 2021 - 24 September 2021 . hdl:10013/epic.5938af52-63f2-498a-bf7b-f00ed0581264 |
_version_ |
1810447615866699776 |