=

accident - En tectonique : terme général désignant TOUTE surface de contact anormal (= mécanique = tectonique) commes les failles, les décrochements, les charriages ...

front 1. En tectonique, partie la plus avancée d'une nappe ou d'un pli couché ...
[Dict. de géologie, Foucault & Raoult]

An absolutely exact translation would thus require knowledge of the local geology, but "thrust front" is probably close enough, and gets hits for the Pyrenees.

The South Pyrenean foreland has a buried thrust front geometry where evaporitic levels are present at the subsurface and are suitable to be detachment horizons ...
www.geologica-acta.com:8080/geoacta/ MostrarAbstractAC.do?abstract=gav0103a01

Spectacular pinnacles of Miocene alluvial fan conglomerates beneath the thrust front of the External Sierras in the Rio Galleago Gorge at Riglos. The alluvial fans at Riglos and Aguero provide superb exposures of ancient alluvial fan deposits and their relationship to synsedimentary tectonic deformation during the Pyrenean orogeny.
[http://www.bbk.ac.uk/earthsciences/third.htm]

central Pyrenees contain pebbles derived from both the basement units of the Axial Zone and local sources related with the emergence of the thrust front and ...
www.ija.csic.es/gt/gdl/Gdl/Euroconf/ft3.html

Outline of Geology: Thrust front of Pyrenees, major recumbent
anticline is possible to map, and two backthrust packages. ...
teachserv.earth.ox.ac.uk/~geolsoc/ map_proj/europe/spain/pyrenees.htm

Fold development related to contractional salt tectonics: southeastern Pyrenean thrust front, Spain, in ... de la partie centrale du versant sud des Pyrénées: Pub ...
www.virtualexplorer.com.au/2002/8/verges/paper3.html