  We analyze signals at the Large Hadron Collider (LHC) from production and
decay of Kaluza-Klein (KK) gravitons in the context of "extended" warped
extra-dimensional models, where the standard model (SM) Higgs and fermion
fields are restricted to be in-between the usual ultraviolet/Planck brane and a
$\sim O(10)$ TeV (new, "intermediate") brane, whereas the SM gauge fields (and
gravity) propagate further down to the $\sim O( \hbox{TeV} )$ infrared brane.
Such a framework suppresses flavor violation stemming from KK particle effects,
while keeping the KK gauge bosons and gravitons accessible to the LHC. We find
that the signals from KK graviton are significantly different than in the
standard warped model. This is because the usually dominant decay modes of KK
gravitons into top quark, Higgs and longitudinal $W/Z$ particles are suppressed
by the above spatial separation between these two sets of particles, thus other
decay channels are allowed to shine themselves. In particular, we focus on two
novel decay channels of the KK graviton. The first one is the decay into a pair
of radions, each of which decays (dominantly) into a pair of SM gluons,
resulting in a resonant 4-jet final state consisting of two pairs of dijet
resonance. On the other hand, if the radion is heavier and/or KK gluon is
lighter, then the KK graviton mostly decays into a KK gluon and a SM gluon. The
resulting KK gluon has a significant decay branching fraction into radion and
SM gluon, thereby generating (again) a 4-jet signature, but with a different
underlying event topology, i.e., featuring now three different resonances. We
demonstrate that the High-Luminosity LHC (HL-LHC) has sensitivity to KK
graviton of (up to) $\sim 4$ TeV in both channels, whereas it is unlikely to
have sensitivity in the standard dijet resonance search channel from KK
graviton decay into two gluons.
