Heights and periods of algebraic cycles in families

We consider the Beilinson--Bloch heights and Abel--Jacobian periods of homologically trivial Chow cycles in families. For the Beilinson--Bloch heights, we show that for any g 2, there is a Zariski open dense subset U of Mg, the coarse moduli of curves of genus g over rationals, such that the heights of Ceresa cycles and Gross--Schoen cycles over U satisfy the Northcott property. For the Abel--Jacobi periods, we provide an algebraic criterion for the existence of a Zariski open dense subset of any family such that all cycles not defined over Q are non-torsion and verify that this criterion holds for Ceresa cycles and Gross--Schoen cycles.