Terrestrial Observation

Permanent Accelerometric Network

The Permanent RAP Accelerometric Network is a national network of instruments that record ground motion caused by earthquakes. It centralises the data and makes them available to all actors involved in the analysis of hazard and seismic risk. The RAP is a component of RESIF, a French seismological and geodesic network.

Les stations  du RAP sont regroupées en réseaux régionaux gérés par des organismes et établissements publics ayant pour vocation l’observation sismologique. L’ UBO, au travers de notre laboratoire, est en charge du sous-réseau RAP-UBO avec l’Université de Bretagne Sud et l’Université de Nantes, qui comprend  4 stations: UBBR, UBQP, UBVA et UBNA.

Map of regional seismicity

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