Tuorla observatory seminar series

Tuorla seminars in spring 2017

Seminars will be streamed online unless otherwise informed. No registration required and the weblink is given later in the announcement of the seminar. The connection starts sligthly before the seminar. 

After the seminar you can ask questions by using the chat window in the ADOBE CONNECT interface. We hope to recieve a lot of questions!

The seminars are held on Thursdays at 14.30 unless otherwise noticed. The title of the talk will be added as the seminar approaches.

Lauri J. Pesonen (University of Helsinki): “The great impact hunt in Fennoscandia - New results and remaining questions”.

Impact cratering is the most fundamental geological process occurring in oursolar system. Currently some 32 impact structures have beed discovered in Fennsocandia including Baltic countries. This is 17% of the global impact database. During the last 25 years Nordic/Baltic cooperation has been tight and organized through NorFa, Nordforsk and the European (ESF) Impact Network. New advanced ways of analyzing geophysical maps in combination with geochemical analyses, microscopic studies, image processings (e.g., Lidar) and numerical modeling have been the main methods behind the succes of finding some 20 new impact structures in last 25 years, the project “The Great Impact Hunt in Fennoscandia”.  A vital part of the success is also a reflection of a succesful co-operation by mineral exploration and kimberlite drilling companies. In addition an overall high basement age of the Fennoscandian Shield has made the area exposed for asteroid and cometary impacts for a long time; the possible crater sampling period is optimal in these parts of the world. Impact structures globally host economically valuable resources (ores, hydrocarbons, water) and have become popular tourism attractions. This fact, together with the active impact research in the region, explains that impact as a scientific topic has found its place in the curriculum of Nordic-Baltic universities.