Tvären
Tvären is a circular bay close to Studsvik, Sweden.
Within the bay is an ancient buried impact crater about 2 kilometres (1.2 mi) in diameter. It was first identified using reflection seismology. The crater is estimated to be about 455 million years old (Late Ordovician).[1][2]
Asteroid 7771 Tvären is named after the bay.
References
- ^ "Tvären". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2009-08-20.
- ^ Flodén, Tom; Tunander, Pål; Wickman, Frans E. (1986). "The Tvären Bay structure, an astrobleme in southeastern Sweden". Geologiska Föreningen i Stockholm Förhandlingar. 108 (3): 225–234. doi:10.1080/11035898609454687.
58°46′N 17°25′E / 58.767°N 17.417°E / 58.767; 17.417
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