The focal depths of Swedish seismic activity and their relation to knowledge about stick-slip motion of granites for varying pressures and temperature are shown. Agreement is very good with most seismic activity in the range 7 to 18 km. One earthquake is found to have a most likely focal depth just below the Moho discontinuity while no earthquake is observed in the lowest 10 km of crust. The apparent crustal thickness of southern Sweden was studied by regional network recordings. The results are given as an apparent crustal thickness map. The crustal thickness seems to vary between 32 and 48 km and indicates a possible block structure with block sizes of the order of 50 to 150 km.
Final Report Research Inst. of National Defence
- Pub Date:
- April 1985
- Earth Crust;
- Earthquake Damage;
- Structural Properties (Geology);
- Tables (Data);