ON A SPECTRAL VARIATIONAL PROBLEM ARISING IN THE STUDY OF EARTHQUAKES

Introduction The purpose of this paper is twofold: first, we establish a multiplicity result for a nonlinear symmetric variational inequality; next, we study the effect of an arbitrary perturbation. For related results and further comments we refer to our recent papers [11] (for an appropriate variational inequality) and [2, 5, 14] for the hemivariational framework.