[S01-2] Open session II

[S01-2-04] Compilation of a Seismic Bulletin for the European Arctic

^○Johannes Schweitzer¹, Yana Konechnaya², Andrey Fedorov³, Steven Gibbons⁴, Berit Paulsen⁴, Myrto Pirli⁵ (1.NORSAR / University of Oslo, Norway, 2.Federal Center for Integrated Arctic Research, Arkhangelsk, Russia, 3.Kola Regional Seismological Centre, Apatity, Russia, 4.NORSAR, Kjeller, Norway, 5.Skjetten, Norway)

During the years 2014 - 2016, a joint Norwegian-Russian project between the three partners NORSAR in Kjeller, Norway, the Federal Center for Integrated Arctic Research of the Ural Branch of RAS in Arkhangelsk and the Kola Branch of the Geophysical Survey of RAS in Apatity, was jointly financed by Norwegian and Russian research agencies. One task of this project was to compile a joint seismic bulletin for the European Arctic for the last decades. The main sources for this new bulletin were the data collected at the International Seismological Centre (ISC), the analyst reviewed bulletins of NORSAR and the two Russian project partners, the bulletins of the IDC in Vienna and its forerunners, the Nordic Bulletin compiled at the University of Helsinki, and the bulletins collected at the University of Bergen. In addition, seismic onsets from permanent and temporary stations read at NORSAR within different projects as e.g., during the IPY, were added to the new bulletin compilation.
The greatest challenge for this new unified bulletin is removing all the onset readings from different agencies analyzing the same seismic stations: due to international data exchange, data from the permanent stations in the European Arctic are in between analyzed by five or more institutions and then reported into the international databases. These institutes are not only processing the data differently, but they may even use different rules to name the seismic onsets.
All these data entries have to be homogenized, to achieve a unified bulletin. The new bulletin contains the most complete collection of seismic events observed in the European Arctic north of latitude 70 degrees for the time period 1990 to autumn 2015.