Tvären - Misplaced Pages

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

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).

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

v t e Impact cratering on Earth
Impact crater Impact event
Lists	Worldwide Africa Antarctica Asia and Russia Australia Europe North America South America By country Possible
Confirmed≥20 km diameter	Acraman Amelia Creek Araguainha Beaverhead Boltysh Carswell Charlevoix Chesapeake Bay Chicxulub Clearwater East and West Gosses Bluff Haughton Kamensk Kara Karakul Keurusselkä Lappajärvi Logancha Manicouagan Manson Mistastin Mjølnir Montagnais Morokweng Nördlinger Ries Obolon' Popigai Presqu'île Puchezh-Katunki Rochechouart Saint Martin Shoemaker Siljan Ring Slate Islands Steen River Strangways Sudbury Tookoonooka Tunnunik Vredefort Woodleigh Yarrabubba
Topics	Alvarez hypothesis Australite Breccia Coesite Complex crater Cretaceous–Paleogene boundary Cryptoexplosion Ejecta blanket Impact crater Impact structure Impactite Late Heavy Bombardment Lechatelierite Meteorite Moldavite Ordovician meteor event Philippinite Planar deformation features Shatter cone Shock metamorphism Shocked quartz Stishovite Suevite Tektite
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

This article about a location in Södermanland County, Sweden is a stub. You can help Misplaced Pages by expanding it.

This article about an impact crater on Earth is a stub. You can help Misplaced Pages by expanding it.

Categories: