Implications on crustal structure from the South Finland Coastal (SOFIC) deep seismic sounding profile
We present results from a deep seismic sounding (DSS) experiment carried out along the southern coast of Finland in summer 2015. Data used in the survey derived from industrial blasts recorded by temporary project stations and permanent network stations. The western 220 km part of the 450 km long So...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/354551 2024-01-07T09:43:10+01:00 Implications on crustal structure from the South Finland Coastal (SOFIC) deep seismic sounding profile Tiira, Timo Janik, Tomasz Veikkolainen, Toni Komminaho, Kari Skrzynik, Tymon Väkevä, Sakari Heinonen, Aku Department of Geosciences and Geography Institute of Seismology 2023-02-14T13:25:01Z application/pdf http://hdl.handle.net/10138/354551 eng eng Geological Society of Finland 10.17741/bgsf/94.2.004 Tiira , T , Janik , T , Veikkolainen , T , Komminaho , K , Skrzynik , T , Väkevä , S & Heinonen , A 2022 , ' Implications on crustal structure from the South Finland Coastal (SOFIC) deep seismic sounding profile ' , Bulletin of the Geological Society of Finland , vol. 94 , no. 2 , pp. 165-180 . https://doi.org/10.17741/bgsf/94.2.004 ORCID: /0000-0001-9447-6146/work/129058719 ORCID: /0000-0003-2740-6185/work/129061407 ORCID: /0000-0003-1297-5748/work/129063742 6adbe7d3-8549-4554-92cf-a53d12dadefb http://hdl.handle.net/10138/354551 cc_by_nc openAccess info:eu-repo/semantics/openAccess 1171 Geosciences Article publishedVersion 2023 ftunivhelsihelda 2023-12-14T00:11:55Z We present results from a deep seismic sounding (DSS) experiment carried out along the southern coast of Finland in summer 2015. Data used in the survey derived from industrial blasts recorded by temporary project stations and permanent network stations. The western 220 km part of the 450 km long Southern Finland Coastal (SOFIC) profile runs along the Uusimaa belt (UB) in the 1.7–1.9 Ga Southern Finland subprovince (SFS) of the Svecofennian domain, while the 170 km part in the east crosses the 1.62–1.65 Ga Wiborg rapakivi batholith (WRB). The farthest 60 km cross a geologically diverse area consisting of supracrustal rocks and granitoids of the Saimaa area (SA), an eastern extension of the SFS. Our results show that the Moho boundary depth varies significantly, from ca. 52–54 km below UB to 40–45 km below WRB. All three crustal layers (upper, middle, and lower) have their maximum depth in the contact zone between UB and the WRB. Below WRB, a lower crust with Vp ~6.7–6.9 km/s is observed. High velocity lower crust was observed below UB (Vp ~7.2 km/s) and possibly below SA (Vp ~7.35 km/s). The modelling was based on ray tracing, using the extrapolation of seismic wave arrival times with the help of travel times predicted from a one-dimensional velocity model. The resulting two-dimensional velocity model partly relies on data from the intersecting DSS profiles and supports previous observations of the lithospheric structure of southeastern Fennoscandia. Peer reviewed Article in Journal/Newspaper Fennoscandia HELDA – University of Helsinki Open Repository Uusimaa ENVELOPE(24.071,24.071,66.248,66.248) Bulletin of the Geological Society of Finland 94 2 165 180 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
1171 Geosciences |
spellingShingle |
1171 Geosciences Tiira, Timo Janik, Tomasz Veikkolainen, Toni Komminaho, Kari Skrzynik, Tymon Väkevä, Sakari Heinonen, Aku Implications on crustal structure from the South Finland Coastal (SOFIC) deep seismic sounding profile |
topic_facet |
1171 Geosciences |
description |
We present results from a deep seismic sounding (DSS) experiment carried out along the southern coast of Finland in summer 2015. Data used in the survey derived from industrial blasts recorded by temporary project stations and permanent network stations. The western 220 km part of the 450 km long Southern Finland Coastal (SOFIC) profile runs along the Uusimaa belt (UB) in the 1.7–1.9 Ga Southern Finland subprovince (SFS) of the Svecofennian domain, while the 170 km part in the east crosses the 1.62–1.65 Ga Wiborg rapakivi batholith (WRB). The farthest 60 km cross a geologically diverse area consisting of supracrustal rocks and granitoids of the Saimaa area (SA), an eastern extension of the SFS. Our results show that the Moho boundary depth varies significantly, from ca. 52–54 km below UB to 40–45 km below WRB. All three crustal layers (upper, middle, and lower) have their maximum depth in the contact zone between UB and the WRB. Below WRB, a lower crust with Vp ~6.7–6.9 km/s is observed. High velocity lower crust was observed below UB (Vp ~7.2 km/s) and possibly below SA (Vp ~7.35 km/s). The modelling was based on ray tracing, using the extrapolation of seismic wave arrival times with the help of travel times predicted from a one-dimensional velocity model. The resulting two-dimensional velocity model partly relies on data from the intersecting DSS profiles and supports previous observations of the lithospheric structure of southeastern Fennoscandia. Peer reviewed |
author2 |
Department of Geosciences and Geography Institute of Seismology |
format |
Article in Journal/Newspaper |
author |
Tiira, Timo Janik, Tomasz Veikkolainen, Toni Komminaho, Kari Skrzynik, Tymon Väkevä, Sakari Heinonen, Aku |
author_facet |
Tiira, Timo Janik, Tomasz Veikkolainen, Toni Komminaho, Kari Skrzynik, Tymon Väkevä, Sakari Heinonen, Aku |
author_sort |
Tiira, Timo |
title |
Implications on crustal structure from the South Finland Coastal (SOFIC) deep seismic sounding profile |
title_short |
Implications on crustal structure from the South Finland Coastal (SOFIC) deep seismic sounding profile |
title_full |
Implications on crustal structure from the South Finland Coastal (SOFIC) deep seismic sounding profile |
title_fullStr |
Implications on crustal structure from the South Finland Coastal (SOFIC) deep seismic sounding profile |
title_full_unstemmed |
Implications on crustal structure from the South Finland Coastal (SOFIC) deep seismic sounding profile |
title_sort |
implications on crustal structure from the south finland coastal (sofic) deep seismic sounding profile |
publisher |
Geological Society of Finland |
publishDate |
2023 |
url |
http://hdl.handle.net/10138/354551 |
long_lat |
ENVELOPE(24.071,24.071,66.248,66.248) |
geographic |
Uusimaa |
geographic_facet |
Uusimaa |
genre |
Fennoscandia |
genre_facet |
Fennoscandia |
op_relation |
10.17741/bgsf/94.2.004 Tiira , T , Janik , T , Veikkolainen , T , Komminaho , K , Skrzynik , T , Väkevä , S & Heinonen , A 2022 , ' Implications on crustal structure from the South Finland Coastal (SOFIC) deep seismic sounding profile ' , Bulletin of the Geological Society of Finland , vol. 94 , no. 2 , pp. 165-180 . https://doi.org/10.17741/bgsf/94.2.004 ORCID: /0000-0001-9447-6146/work/129058719 ORCID: /0000-0003-2740-6185/work/129061407 ORCID: /0000-0003-1297-5748/work/129063742 6adbe7d3-8549-4554-92cf-a53d12dadefb http://hdl.handle.net/10138/354551 |
op_rights |
cc_by_nc openAccess info:eu-repo/semantics/openAccess |
container_title |
Bulletin of the Geological Society of Finland |
container_volume |
94 |
container_issue |
2 |
container_start_page |
165 |
op_container_end_page |
180 |
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1787424424351236096 |