@article{fdi:010079072,
  title = {{C}ontrol of fault weakening on the structural styles of underthrusting-dominated non-cohesive accretionary wedges},
  author = {{B}auville, {A}. and {F}uruichi, {M}. and {G}erbault, {M}uriel},
  editor = {},
  language = {{ENG}},
  abstract = {{U}nderthrusting is a typical process at compressive margins responsible for nappe stacking and sediment subduction. {I}n nature, underthrusting is often associated with weak basal faults, although static mechanical analysis (critical taper theory) suggests that weak basal faults promote accretion while strong basal faults promote underthrusting. {W}e perform mathematical analyses and numerical simulations to determine whether permanent fault weakening promotes or inhibits underthrusting. {W}e investigate the control of permanent fault weakening on the dynamics of a strong-based ((1 -lambda(b)*)mu(b) approximate to (1 -lambda*)mu) non-cohesive wedge (mu and mu(b) are internal and basal friction, respectively). {W}e control the wedge material strength by a spatially constant fluid overpressure factor (lambda*), and fault strength by a plastic strain weakening factor (chi). {F}irst, we use the critical taper theory to determine a mechanical mode diagram that predicts structural styles. {T}hen, we perform numerical simulations of accretionary wedge formation to establish their dynamical structural characteristics. {W}e determine a continuum of structural styles between three end-members which correspond to the theoretical mechanical mode transitions. {S}tyle 1 is characterized by thin tectonic slices and little to no underthrusting. {S}tyle 2 shows thick slices, nappe stacking, and shallow gravity-driven tectonics. {S}tyle 3 displays the complete underthrusting of the incoming sediments, that are exhumed when they reach the backstop. {W}e conclude that in the condition of an initially strong wedge base, permanent fault weakening promotes underthrusting. {T}hus, this contribution enlightens the control of the dynamic evolution of material properties on the formation of subduction channels, slope instabilities, and antiformal nappe stacks.},
  keywords = {},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch. {S}olid {E}arth},
  volume = {125},
  numero = {3},
  pages = {e2019{JB}019220 [27 ]},
  ISSN = {2169-9313},
  year = {2020},
  DOI = {10.1029/2019jb019220},
  URL = {https://www.documentation.ird.fr/hor/fdi:010079072},
}