Lappajärvi (lake)
| Lappajärvi | ||
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| Satellite image of Lappajärvi | ||
| Geographical location | South Ostrobothnia ( Finland ) | |
| Tributaries | Savonjoki , Kurejoki | |
| Drain | Välijoki → Evijärvi | |
| Islands | Kärnänsaari | |
| Places on the shore | Lappajärvi , Vimpeli | |
| Location close to the shore | Alajärvi | |
| Data | ||
| Coordinates | 63 ° 8 ′ N , 23 ° 40 ′ E | |
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| Altitude above sea level | 69.5 m | |
| surface | 145.49 km² | |
| volume | 1.005 km³ | |
| Maximum depth | 36.04 m | |
| Middle deep | 6.88 m | |
| Catchment area | 1526 km² | |
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particularities |
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The Lappajärvi is a lake in the west of Finland . It lies at an altitude of 69.5 m above sea level in the area of the municipalities of Lappajärvi , Vimpeli and Alajärvi . Km² with an area of 145.49, it is the largest lake in the landscape Southern Ostrobothnia and is in the range of the largest lakes in Finland on 33. place.
The lake fills the largest meteorite crater discovered in Finland so far with a diameter of 22 km. After it had long been wrongly assumed that the Lappjärvi was the remains of a volcanic caldera , it was possible in 1976 to prove that the Lappajärvi lake basin was formed around 77.85 million years ago as a meteorite with an estimated 1,500 m diameter Speed of 40 to 60 km / s hit the granite base of the Baltic Shield . The island of Kärnänsaari represents the central mountain of this crater; Apart from that, as is usual with crater lakes, there are hardly any islands in the lake. On Kärnänsaari there are heaped impact rocks , also scattered in the wider area.
At its deepest point, Lappajärvi is 37 meters deep. The main tributaries are Savonjoki and Kurejoki . The Lappajärvi drains over the Välijoki ("intermediate river") to the north to Lake Evijärvi , which in turn flows from the Ähtävänjoki to the Gulf of Bothnia .
Web links
- ymparisto.fi - Lappajärvi - Pohjanmaan helmi (Finnish)
swell
- Impact structures of the world Database by Jarmo Moilanen.Retrieved October 11, 2010
- Earth Impact Database. Retrieved September 6, 2013
Individual evidence
- ↑ a b c d e f JÄRVIWIKI - Lappajärvi (47.031.1.001)
- ↑ ymparisto.fi (Finnish Ministry of the Environment) ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. : Suomen järvet yli 40 neliökilometriä
- ↑ sciencedirect.com - A new U-Pb age for shock-recrystallized zircon from the Lappajärvi impact crater, Finland, and implications for the accurate dating of impact events (2019)
