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On the countable, measure preserving relation induced on an homogeneous quotient, by the action of a discrete group

We consider a countable discrete group $G$ acting ergodicaly and a.e. freely, by measure-preserving transformations, on an infinite measure space $(\mathcal X,ν)$ with $σ$-finite measure $ν$. Let $Γ\subseteq G$ be an almost normal subgroup with fundamental domain $F\subseteq \mathcal X $ of finite measure. Let $\mathcal R_G$ be the countable measurable equivalence relation on $\mathcal X$ determined by the orbits of $G$. Let $\mathcal R_G| F$ be its restriction to $F$. We find an explicit presentation, by generators and relations, for the von Neumann algebra associated, by the Feldman-Moore (\cite{FM}) construction, to the relation $\mathcal R_G|_F$. The generators of the relation $\mathcal R_G|_F$ are a set of transformations of the quotient space $F\cong \mathcal X/ Γ$, in a one to one correspondence with the cosets of $Γ$ in $G$. We prove that the composition formula for these transformations is an averaged version, with coefficients in $L^\infty(F,ν)$, of the Hecke algebra product formula (\cite{BC}). In the situation $G = PGL_2(\mathbb Z[\frac1p])$, $Γ=PSL_2(\mathbb Z)$, $p\geq 3$ prime number, the relation $\mathcal R_G|_F$ is the equivalence relation associated to a free, measure-preserving action of a free group on $(p+1)/2$ generators on $F$ (\cite{Ad},\cite {Hj}). We use the coset representations of the transformations generating $\mathcal R_G|_F$ to find a canonical treeing (\cite{Ga}).