), most of the earthquakes (80%)
occur in the upper crust down to 17 km in depth, a minority (19%) in the middle crust (17-31 km) and
only a few in the lower crust 31-45 km (1%) [1]. The seismogenic layer is less than
30 km in depth.
The layer seems to be rather uniform across Fennoscandia. We suggest that the middle to lower crustal
boundary may add compositional and rheological constraints
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