Tvären

Tvären is a circular bay close to Studsvik, Sweden.

Tvären Bay, Sweden, with Tvären impact structure indicated

Within the bay is an ancient buried impact crater about 2 km 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
  1. "Tvären". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2009-08-20.
  2. Tom Flodén, Pål Tunander & Frans E. Wickman (1986) The Tvären Bay structure, an astrobleme in southeastern Sweden, Geologiska Föreningen i Stockholm Förhandlingar, 108:3, 225-234, DOI: 10.1080/11035898609454687


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