Lake Yanisyarvi - Wikipedia

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Yanisyarvi

Yanisyarvi Show map of Russia Yanisyarvi Show map of Karelia
Location	Republic of Karelia
Coordinates	61°58′N 30°55′E / 61.967°N 30.917°E / 61.967; 30.917
Type	Impact crater lake
Primary outflows	Jänisjoki
Basin countries	Russia

Average depth	11.6 m (38 ft)
Max. depth	57 m (187 ft)

Lake Yanisyarvi (Russian: Янисъярви; Finnish: Jänisjärvi) is a lake in the Republic of Karelia, Russia, located north of and draining to Lake Ladoga.

The basin of this somewhat circular lake was formed by meteorite impact 700±5 million years ago during the Cryogenian period. The crater is 14 kilometers (8.7 mi) in diameter.^[1]

Prior to World War II, the lake was thought to be the second known volcanic caldera in Finland (the other was Lake Lappajärvi). Both were eventually recognized as impact craters.

References

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^ "Jänisjärvi". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2009-08-19.

External links

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Lake Jänisjärvi Impact Crater at NASA Earth Observatory

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Research	Ralph Belknap Baldwin Daniel Barringer Barringer Medal Edward C. T. Chao Robert S. Dietz William Kenneth Hartmann H. Jay Melosh Graham Ryder Peter H. Schultz Eugene Merle Shoemaker Earth Impact Database Impact Field Studies Group Lunar and Planetary Institute Traces of Catastrophe

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