The aim of the present manuscript is to derive an expression for the lower bound of the modulus of the Dirichlet eta function on vertical lines ℜpsq " α. An approach based on a two-dimensional principal component analysis matching the dimensions of the complex plane, which is built on a parametric ellipsoidal shape, has been undertaken to achieve this result. This lower bound, which is expressed as @s P C s.t. ℜpsq ě 1 2 , |ηpsq| ě 1 ´?2 2 α where η is the Dirichlet eta function, has implications for the Riemann hypothesis as |ηpsq| ą 0 for any s P C such that ℜpsq P s 1 2 , 1r.