Suvasvesi

Suvasvesi is a lake in Eastern Finland near the town of Kuopio. Suvasvesi consists of two circular open lakes, Kuukkarinselkä in north and Haapaselkä in south. The lakes are separated by a group of islands. The lake has 688 islands in total. The area of the lake is 234 square kilometres (90 sq mi) making it the 18th largest lake in Finland. Kuukkarinselkä is the third deepest lake in Finland measuring 89.0 metres (292.0 ft) in the deepest point.

Suvasvesi
Landsat 7 image
with the impact structures in gray.
LocationNorthern Savonia
Coordinates62°39′N 028°12′E
TypeImpact crater lake
Basin countriesFinland
Surface area233.58 km2 (90.19 sq mi)[1]
Max. depth89.0 m (292 ft)[2]
Surface elevation81.7 m (268 ft)[1]
Islands688[3]
References[1][2][3]

In 2001, shatter cones were found in Kuukkarinselkä making it the 6th known impact crater in Finland. The crater, usually referred as Suvasvesi North crater, is located in the center of Kuukkarinselkä and measures about 3.5 kilometres (2.2 mi) in diameter. Its age is estimated to be about 85 Ma[4] but the Earth Impact Database (EID) gives a broader span of less than 1000 Ma.[5]

Haapaselkä resembles the northern counterpart and it was also suspected to be an impact crater. It has recently been confirmed and is usually referred as Suvasvesi South crater.[1][2][6] It is similar in size, and the age of the crater is estimated to be older than 700 Ma (probably about 710–720 Ma) based on argon-argon dating of impact melt rocks found near the southeastern shore of Lake Haapaselkä[7] but EID gives it as around 250 Ma.[6]

See also

References
  1. Finnish Environment Institute: Finnish lakes larger than 40 square kilometers Archived 2011-07-25 at the Wayback Machine
  2. Pohjois-Savon ympäristökeskus: Suvasvesi Archived 2007-09-27 at the Wayback Machine
  3. Kauko Huotari: Suomen suurimmat järvet Archived 2009-04-26 at the Wayback Machine
  4. Schmieder, M., Schwarz, W. H., Buchner, E., Pesonen, L. J., Lehtinen, M. & Trieloff, M. 2012. Double and multiple impact events on Earth - Hypotheses, tests, and Problems. 75th MetSoc meeting (13–18 August 2012), Cairns, Australia, abstract no. 5005.
  5. "SuvasvesiNorth". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2016-05-25.
  6. "SuvasvesiSouth". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2016-05-25.
  7. Buchner, E., Schmieder, M., Schwarz, W. H., Trieloff, M., Moilanen, J., Öhman, T., Stehlik, H.: A Proterozoic 40Ar/39Ar age for the Suvasvesi South structure (Finland). MetSoc 72, abstract no. 5076


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