We study the influence of a low frequency vibration on a long-wave Marangoni convection in a
layer of a binary mixture with the Soret effect. A linear stability analysis is performed numerically
by means of the Floquet theory; several limiting cases are treated analytically. Competition of
subharmonic, synchronous, and quasiperiodic modes is considered. The vibration is found to
destabilize the layer, decreasing the stability threshold. Also, a vibration-induced mode is detected,
which takes place even for zero Marangoni number
