  We study the compact stars internal structure and observable characteristics
alterations due to the quark deconfinement phase transition. To proceed with,
we investigate the properties of isospin-asymmetric nuclear matter in the
improved relativistic mean-field (RMF) theory, including a scalar-isovector
\delta-meson effective field. In order to describe the quark phase, we use the
improved version of the MIT bag model, in which the interactions between u, d
and s quarks inside the bag are taken into account in the one-gluon exchange
approximation. We compute the amount of energy released by the corequake for
both cases of deconfinement phase transition scenarios, corresponding to the
Maxwellian type ordinary first-order phase transition and the phase transition
with formation of a mixed quark-hadron phase (Glendenning scenario).
