Tvären
Tvären is a circular bay close to Studsvik, Sweden.
| Tvären | |
|---|---|
 Tvären Bay, Sweden, with Tvären impact structure indicated | |
| Impact crater/structure | |
| Confidence | Confirmed |
| Diameter | 2 kilometres (1.2 mi) |
| Age | 455 Ma |
| Location | |
| Country | Sweden |
| Municipality | Studsvik |
  | |
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.
- 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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