  We examine the anisotropy originated from a first-order vacuum phase
transitions through three-dimensional numerical simulations. We apply Bianchi
Type-I metric to our model that has one scalar field minimally coupled to the
gravity. We calculate the time evolution of the energy density for the shear
scalar and the directional Hubble parameters as well as the power spectra for
the scalar field and the gravitational radiation although there are a number of
caveats for the tensor perturbations in Bianchi Type-I universe. We run
simulations with different mass scales of the scalar field, therefore, in
addition to investigation of anisotropy via the shear scalar, we also determine
at which mass scale the phase transition completes successfully, hence,
neglecting the expansion of the Universe does not significantly affect the
results. Finally, we showed that such an event may contribute to the total
anisotropy depending on the mass scale of the scalar field and the initial
population of nucleated bubbles.
