Structure of the crust and uppermost mantle beneath southern Finland revealed by analysis of local events registered by the SVEKALAPKO seismic array.
In 1998–1999, a large-scale seismic array was deployed in Finland as a part of the EUROPROBE/SVEKALAPKO subproject, involving 14 European universities and research institutes. The objective of the project was to map the deep lithosphere structure and thickness beneath the Fennoscandian Shield by mea...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_231796 2023-05-15T16:13:10+02:00 Structure of the crust and uppermost mantle beneath southern Finland revealed by analysis of local events registered by the SVEKALAPKO seismic array. SVEKALAPKO Seismic Tomography Working Group Yliniemi, J. Kozlovskaya, E. Hjelt, S. Komminaho, K. Ushakov, A. 2.1 Physics of Earthquakes and Volcanoes, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum 2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum 2004 https://gfzpublic.gfz-potsdam.de/pubman/item/item_231796 unknown info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2004.07.056 https://gfzpublic.gfz-potsdam.de/pubman/item/item_231796 Tectonophysics 550 - Earth sciences info:eu-repo/semantics/article 2004 ftgfzpotsdam https://doi.org/10.1016/j.tecto.2004.07.056 2022-09-14T05:55:07Z In 1998–1999, a large-scale seismic array was deployed in Finland as a part of the EUROPROBE/SVEKALAPKO subproject, involving 14 European universities and research institutes. The objective of the project was to map the deep lithosphere structure and thickness beneath the Fennoscandian Shield by means of teleseismic events. In addition, about 580 local seismic events were registered during the data acquisition period. Among them, only eight local earthquakes were recorded, the rest being quarry blasts from mining sites in Russia, Finland, Estonia and Sweden. In this study, we present the analysis of the seismic wave field from the strongest local events registered by the majority of the stations of the SVEcofennian–KArelian–LAPland–KOla Transect (SVEKALAPKO) array with the aim of mapping the structure of the upper mantle beneath the array. For this purpose, we selected the events corresponding to a single source type and compared these recordings with those from wide-angle reflection and refraction experiments in the area to identify the regional phases. The record sections of selected events demonstrate strong reflections (PmP) from the Moho boundary. The refracted Pn phases can be seen as first arrivals at distances of about 200–400 km from the source. At offsets of about 400–800 km, phases reflected from inhomogeneities in the uppermost mantle (P1) and double reflections from the Moho boundary (PmPPmP) were recorded. Results from 2D forward ray trace modeling of reflected and refracted P-waves along four profile swathes from SVEKALAPKO stations demonstrate that the mantle reflections originate from two different groups of boundaries beneath the array: one group of phases arrive from subhorizontal and gently dipping reflectors below the Moho boundary at a depth of 70–90 km, while the other group are phases originating from a depth of 100 to 130 km. Based on the irregular character of the first group of reflections, their different spatial orientation and correlation with the Moho offsets, we interpret the ... Article in Journal/Newspaper Fennoscandian karelia* karelia* karelian Lapland GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Tectonophysics 394 1-2 41 67 |
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Open Polar |
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GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
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ftgfzpotsdam |
language |
unknown |
topic |
550 - Earth sciences |
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550 - Earth sciences SVEKALAPKO Seismic Tomography Working Group Yliniemi, J. Kozlovskaya, E. Hjelt, S. Komminaho, K. Ushakov, A. Structure of the crust and uppermost mantle beneath southern Finland revealed by analysis of local events registered by the SVEKALAPKO seismic array. |
topic_facet |
550 - Earth sciences |
description |
In 1998–1999, a large-scale seismic array was deployed in Finland as a part of the EUROPROBE/SVEKALAPKO subproject, involving 14 European universities and research institutes. The objective of the project was to map the deep lithosphere structure and thickness beneath the Fennoscandian Shield by means of teleseismic events. In addition, about 580 local seismic events were registered during the data acquisition period. Among them, only eight local earthquakes were recorded, the rest being quarry blasts from mining sites in Russia, Finland, Estonia and Sweden. In this study, we present the analysis of the seismic wave field from the strongest local events registered by the majority of the stations of the SVEcofennian–KArelian–LAPland–KOla Transect (SVEKALAPKO) array with the aim of mapping the structure of the upper mantle beneath the array. For this purpose, we selected the events corresponding to a single source type and compared these recordings with those from wide-angle reflection and refraction experiments in the area to identify the regional phases. The record sections of selected events demonstrate strong reflections (PmP) from the Moho boundary. The refracted Pn phases can be seen as first arrivals at distances of about 200–400 km from the source. At offsets of about 400–800 km, phases reflected from inhomogeneities in the uppermost mantle (P1) and double reflections from the Moho boundary (PmPPmP) were recorded. Results from 2D forward ray trace modeling of reflected and refracted P-waves along four profile swathes from SVEKALAPKO stations demonstrate that the mantle reflections originate from two different groups of boundaries beneath the array: one group of phases arrive from subhorizontal and gently dipping reflectors below the Moho boundary at a depth of 70–90 km, while the other group are phases originating from a depth of 100 to 130 km. Based on the irregular character of the first group of reflections, their different spatial orientation and correlation with the Moho offsets, we interpret the ... |
author2 |
2.1 Physics of Earthquakes and Volcanoes, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum 2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum |
format |
Article in Journal/Newspaper |
author |
SVEKALAPKO Seismic Tomography Working Group Yliniemi, J. Kozlovskaya, E. Hjelt, S. Komminaho, K. Ushakov, A. |
author_facet |
SVEKALAPKO Seismic Tomography Working Group Yliniemi, J. Kozlovskaya, E. Hjelt, S. Komminaho, K. Ushakov, A. |
author_sort |
SVEKALAPKO Seismic Tomography Working Group |
title |
Structure of the crust and uppermost mantle beneath southern Finland revealed by analysis of local events registered by the SVEKALAPKO seismic array. |
title_short |
Structure of the crust and uppermost mantle beneath southern Finland revealed by analysis of local events registered by the SVEKALAPKO seismic array. |
title_full |
Structure of the crust and uppermost mantle beneath southern Finland revealed by analysis of local events registered by the SVEKALAPKO seismic array. |
title_fullStr |
Structure of the crust and uppermost mantle beneath southern Finland revealed by analysis of local events registered by the SVEKALAPKO seismic array. |
title_full_unstemmed |
Structure of the crust and uppermost mantle beneath southern Finland revealed by analysis of local events registered by the SVEKALAPKO seismic array. |
title_sort |
structure of the crust and uppermost mantle beneath southern finland revealed by analysis of local events registered by the svekalapko seismic array. |
publishDate |
2004 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_231796 |
genre |
Fennoscandian karelia* karelia* karelian Lapland |
genre_facet |
Fennoscandian karelia* karelia* karelian Lapland |
op_source |
Tectonophysics |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2004.07.056 https://gfzpublic.gfz-potsdam.de/pubman/item/item_231796 |
op_doi |
https://doi.org/10.1016/j.tecto.2004.07.056 |
container_title |
Tectonophysics |
container_volume |
394 |
container_issue |
1-2 |
container_start_page |
41 |
op_container_end_page |
67 |
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1765998784580419584 |