This map of instrumental seismicity of Finistère was made from the Si-Hex catalog published by the French Seismological Central Office from 1964 to 2009 and from the catalog of the LDG / CEA from 2009 to 2013.
It shows a weak to moderate seismicity with magnitudes Mw of 1 to 4.3. Nearby seismological stations, which have helped locate earthquakes, are represented by a triangle. There are three in the region, which does not allow to obtain a precise location of earthquakes.
The main seismogenic faults of Finistère are:
- the South Armorican shear,
- the shear of the Black Mountains,
- the shear of the Monts d’Arrée
- and the Elorn Fault.
The topographic background of the map was made from topographic data of SHOM and IGN. Contacts: Julie Perrot & Christine Authemayou