Burträsk Fault () is a large geological fault located in Northern

Sweden Sweden, formally the Kingdom of Sweden, is a Nordic countries, Nordic country located on the Scandinavian Peninsula in Northern Europe. It borders Norway to the west and north, and Finland to the east. At , Sweden is the largest Nordic count ...

. The fault had a major period of seismic activity following the deglaciation of Fennoscandia about 10,000 years ago. On surface the fault can be observed in the form of a

fault scarp A fault scarp is a small step-like offset of the ground surface in which one side of a fault has shifted vertically in relation to the other. The topographic expression of fault scarps results from the differential erosion of rocks of contrastin ...

, but the fault is longer than the scarp implies. Likely extends northeast below sea level into the

Bothnian Bay The Bothnian Bay or Bay of Bothnia (; ) is the northernmost part of the Gulf of Bothnia, which is in turn the northern part of the Baltic Sea. The land holding the bay is still rising after the weight of ice-age glaciers has been removed, and ...

. The Burträsk fault is one of several postglacial faults in northern Sweden that remain seismically active. Currently, it is the most seismically active area in the whole of Sweden.

References

{{Geology of Fennoscandia Seismic faults of Sweden Landforms of Västerbotten County