Caution (August 2025) : the loose ledge in the middle of the traverse has been strengthened with a piece of wood and one should verify the solidity of the system before trying this problem.
Sitstart completly right and traverse to the left as for Annonce Catastrophée, climb the wall and continue with top holds as for Sismique.
NB: it is also possible to traverse with low holds after the dihedral (7a+).