  The debate surrounding fast magnetic energy dissipation by magnetic
reconnection has remained a fundamental topic in the plasma universe, not only
in the Earth's magnetosphere but in astrophysical objects such as pulsar
magnetospheres and magnetars, for more than half a century. Recently,
nonthermal particle acceleration and plasma heating during reconnection have
been extensively studied, and it has been argued that rapid energy dissipation
can occur for a collisionless "thin" current sheet, the thickness of which is
of the order of the particle gyro-radius. However, it is an intriguing enigma
as to how the fast energy dissipation can occur for a "thick" current sheet
with thickness larger than the particle gyro-radius. Here we demonstrate, using
a high-resolution particle-in-cell simulation for a pair plasma, that an
explosive reconnection can emerge with the enhancement of the inertia
resistivity due to the magnetization of the meandering particles by the
reconnecting magnetic field and the shrinkage of the current sheet. In
addition, regardless of the initial thickness of the current sheet, the time
scale of the nonlinear explosive reconnection is tens of the Alfv\'{e}n transit
time.
