Sweden has thirteen structures for which an impact origin is considered. Impact related research is being conducted at four universities (Stockholm-Technical University, universities of Luleå, Lund and Stockholm) ranging from impact related global extinctions and associated biological phenomena to impact crater structure based on geophysical modeling. Several of the universities cooperate in specific tasks like the exploration of impact fracturing in bedrock as a source for extraction of geothermal energy and the characteristics of impact generated brecciation and crater collapse. The increased meteorite influx during the Ordovician era is studied with respect to palaeoecology, oceanography and geochemistry.
Swedish research projects/craters:
Ongoing research in the Lockne, Tvären (pdf) and Björkö crater.
Some more swedish proven or possible craters:
Dellen
Mien
Tor
Åvikebukten
Gallejaure
Granby
Duobblon
See also map and list in: Henkel, H., and Pesonen, L., 1992: Impact craters and craterform structures in Fennoscandia. Tectonophysics 216:31-40.