  Since long back, scientists have been putting enormous effort to understand
earthquake dynamics -the goal is to develop a successful prediction scheme
which can provide reliable alarm that an earthquake is imminent. Model studies
sometimes help to understand in some extend the basic dynamics of the real
systems and therefore is an important part of earthquake research. In this
report, we review several physics models which capture some essential features
of earthquake phenomenon and also suggest methods to predict catastrophic
events being within the range of model parameters.
