  The safe operation of most tokamaks, especially the largen sized ones, rely
on the feedback control of the vertical displacement events (VDEs). However,
most these feedback control systems are based on the axisymmetric VDE models.
In this work, we use NIMROD simulations to study the roles of non-axisymmetric
perturbations in free drift vertical displacement events on EAST. The high-$n$
modes in non-axisymmetric VDE grow first, which drive the formation of high-$n$
magnetic island chains. Subsequently, the magnetic island chains grow and
overlap with each other, leading to the destruction of the magnetic flux
surface, which induces a minor disruption and accelerates the start of the
following major disruption. The magnetic island and the stochastic magnetic
field allow the toroidally asymmetric poloidal plasma current to jet towards
the hoop force direction, forming the finger and filamentary structures. Such a
plasma current asymmetry strongly depends on the anisotropy in thermal
transport coefficients.
