Mattila, and 7 co-authors, reported in 2019 that an analysis of high-resolution LiDAR-based digital elevation models (DEMs), trenching of Quaternary deposits, diamond drilling and a structural analysis of the bedrock were conducted in order to characterize the geological structure and to derive full slip profiles of the Venejarvi - Jauhojarvi post-glacial fault complex located in northern Finland. The Venejarvi-Jauhojarvi fault complex consists of 17 surface ruptures striking in a SW-NE direction, cutting through Late Weichselian till and traceable for a total distance of 29.9 km. Based on stratigraphical and structural analysis, the authors show that the Naamivitikko fault segment, which is part of the Venejarvi - Jauhojarvi complex, hosted up to three distinct slip events and it is therefore argued that the prevailing single-rupture hypothesis of post-glacial faults should be treated with caution.
Based on the measured surface rupture dimensions, it is conservatively estimated that the maximum moment magnitude of the paleoseismic event that the complex hosted, ranged between Mw = 5.8 to 8.4. If uncertainties in the scaling laws equating surface rupture dimensions to moment magnitudes are accounted for, a more realistic maximum moment magnitude range between Mw = 5.8 to 7.6.
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