  We study interfacial waves in a system of two horizontal layers of immiscible
inviscid fluids involved into horizontal vibrational motion. We analyze the
linear and nonlinear stability properties of the solitons in the system and
consider two-soliton collision scenarios. We describe the events of explosive
formation of sharp peaks on the interface, which may presumably lead to the
layer rapture, and find that beyond the vicinity of this peaks the system
dynamics can be represented as a kinetics of a soliton gas.
