Lake Lappajärvi
| Lake Lappajärvi | |
|---|---|
 Lappajärvi is the largest lake near the lower right corner. | |
| Location | Lappajärvi, Finland |
| Coordinates | 63°12′N 023°42′E / 63.200°N 23.700°E |
| Type | impact crater |
| Primary outflows | Ähtävänjoki |
| Basin countries | Finland |
| Surface area | 145.49 km2 (56.17 sq mi)[1] |
| Max. depth | 36 m (118 ft) |
| Surface elevation | 69.5 m (228 ft)[1] |
| Islands | 56 (Kärnä) |
| References | [1] |
Lappajärvi is a lake in Finland, in the municipalities of Lappajärvi, Alajärvi and Vimpeli.[1] It is formed in a 23 km (14 mi) wide, partly eroded meteorite impact crater.[2] The lake is part of Ähtävänjoki (Swedish: Esse å) basin together with Lake Evijärvi that is located downstream (north) of it.
The Lappajärvi impact structure is estimated to be 76.20 ± 0.29 million years old (Campanian stage of the Late Cretaceous time period).[3] Experts woking on Finland's Olkiluoto nuclear waste repository project have studied Lake Lappajärvi to help them project how Finnish landscapes might look one million years in the future and beyond.[4]
An island in the middle of the lake, Kärnänsaari (Kärnä Island), gives the name to the black impact melt rock (impactite) found there, locally called kärnäite.[5]
The towns on the shore are Lappajärvi and Vimpeli. Although not very near any, the nearest major city is Seinäjoki.
Gallery
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Lake Lappajärvi -
Lake Lappajärvi -
Frozen in winter
References
- ^ a b c d "Finnish lakes larger than 40 square kilometers". Finnish Environment Institute.
- ^ "Lappajärvi". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2009-05-24.
- ^ "The Lappajärvi impact structure (Finland): Age, duration of crater cooling, and implications for early life". Schmieder M. & Jourdan F. (2013) Geochimica et Cosmochimica Acta, vol. 112, p. 321-339.
- ^ Ialenti, Vincent (5 July 2016). "Craters & Mudrock: Tools for Imagining Distant Future Finlands". The Long Now Foundation.
- ^ http://www.gastro.physics.helsinki.fi/tutkimus/geo/kiintea/lappa.html
External links
Media related to Lake Lappajärvi at Wikimedia Commons- Lappajärvi impact structure
- Lake Lappajärvi, a meteorite impact site in western Finland by Martti Lehtinen (1976)
