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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2023
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/357489 2023-08-20T04:06:25+02:00 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 Suomen ympäristökeskus The Finnish Environment Institute 2023-04-27T12:50:41Z 165-180 application/pdf http://hdl.handle.net/10138/357489 eng eng The Geological Society of Finland 10.17741/bgsf/94.2.004 Bulletin of the Geological Society of Finland 0367-5211 1799-4632 2 94 http://hdl.handle.net/10138/357489 URN:NBN:fi-fe2023042739197 CC BY-NC 4.0 seismology Moho reflection profile crust earth's crust lithosphere deep sounding tectonics Precambrian Fennoscandia Finland Southern Finland seismologia maankuori litosfääri syväluotaus tektoniikka prekambri Fennoskandia Suomi Etelä-Suomi Uusimaa A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä A1 Journal article (refereed), original research 2023 ftunivhelsihelda 2023-07-28T06:12:20Z 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. Article in Journal/Newspaper Fennoscandia Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto Uusimaa ENVELOPE(24.071,24.071,66.248,66.248) |
institution |
Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
seismology Moho reflection profile crust earth's crust lithosphere deep sounding tectonics Precambrian Fennoscandia Finland Southern Finland seismologia maankuori litosfääri syväluotaus tektoniikka prekambri Fennoskandia Suomi Etelä-Suomi Uusimaa |
spellingShingle |
seismology Moho reflection profile crust earth's crust lithosphere deep sounding tectonics Precambrian Fennoscandia Finland Southern Finland seismologia maankuori litosfääri syväluotaus tektoniikka prekambri Fennoskandia Suomi Etelä-Suomi Uusimaa 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 |
seismology Moho reflection profile crust earth's crust lithosphere deep sounding tectonics Precambrian Fennoscandia Finland Southern Finland seismologia maankuori litosfääri syväluotaus tektoniikka prekambri Fennoskandia Suomi Etelä-Suomi Uusimaa |
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. |
author2 |
Suomen ympäristökeskus The Finnish Environment Institute |
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 |
The Geological Society of Finland |
publishDate |
2023 |
url |
http://hdl.handle.net/10138/357489 |
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 Bulletin of the Geological Society of Finland 0367-5211 1799-4632 2 94 http://hdl.handle.net/10138/357489 URN:NBN:fi-fe2023042739197 |
op_rights |
CC BY-NC 4.0 |
_version_ |
1774717448131444736 |