  Inclusive and differential fiducial cross sections of Higgs boson production
in proton-proton collisions are measured in the $H \rightarrow ZZ^* \rightarrow
4\ell$ decay channel. The proton-proton collision data were produced at the
Large Hadron Collider at a centre-of-mass energy of 13 TeV and recorded by the
ATLAS detector in 2015 and 2016, corresponding to an integrated luminosity of
36.1 fb$^{-1}$. The inclusive fiducial cross section in the $H \rightarrow ZZ^*
\rightarrow 4\ell$ decay channel is measured to be 3.62 $\pm$ 0.50 (stat)
$^{+0.25}_{-0.20}$ (sys) fb, in agreement with the Standard Model prediction of
2.91 $\pm$ 0.13 fb. The cross section is also extrapolated to the total phase
space including all Standard Model Higgs boson decays. Several differential
fiducial cross sections are measured for observables sensitive to the Higgs
boson production and decay, including kinematic distributions of jets produced
in association with the Higgs boson. Good agreement is found between data and
Standard Model predictions. The results are used to put constraints on
anomalous Higgs boson interactions with Standard Model particles, using the
pseudo-observable extension to the kappa-framework.
