  We introduce different types of quenches to probe the non-equilibrium
dynamics and multiple collective modes of bilayer fractional quantum Hall
states. We show that applying an electric field in one layer induces
oscillations of a spin-1 degree of freedom, whose frequency matches the
long-wavelength limit of the dipole mode. On the other hand, oscillations of
the long-wavelength limit of the quadrupole mode, i.e., the spin-2 graviton, as
well as the combination of two spin-1 states, can be activated by a sudden
change of band mass anisotropy. We construct an effective field theory to
describe the quench dynamics of these collective modes. In particular, we
derive the dynamics for both the spin-2 and the spin-1 states and demonstrate
their excellent agreement with numerics.
