The purpose of this article is to focus on some aspects of the self-exciting instability known as ground resonance by showing and discussing some associated eigenvectors behavior inside and outside the rotor rotational instability ranges. The rotor model considers a multibladed rotor with three or more rigid blades attached to the hub including hinge offsets, each blade having springs and external dampers for both flap and lead-lag. Analysis neglects aerodynamics effects. Two sets of equations of motion are employed to simulate the catastrophic phenomena. Eigenvalue results are presented in terms of both modal frequency and modal damping as function of the rotor rotational speed. Correspondent eigenvector phasors are plotted for different regimes of the rotor rotational speed. An interpretation on the nature and existence of phenomenon is offered.