  In this article, we study a type of one-field approach for open inflationary
universe scenario in the context of braneworld models with a Gauss-Bonnet
correction term. For a one-bubble universe model, we determine and characterize
the existence of the Coleman-De Lucia instanton together with the period of
inflation after tunneling has occurred. Our results are compared those
analogous obtained when the usual Einstein Theory of Gravitation is used.
