2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/124144The modulational instability of nonlinearly interacting spatially incoherent Stokes waves is analyzed. Starting from a pair of nonlinear Schroedinger equations, we derive a coupled set of wave-kinetic equations by using the Wigner transform technique. It is shown that the partial coherence of the interacting waves induces novel effects on the dynamics of crossing sea states.10 pages, 8 figures, to appear in JETP LettersChaotic Dynamicstext