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We present evidence for the existence of substructure in the "relaxedappearing" cold front clusters Abell 2142 and RXJ1720.1+2638. The detection ofthese substructures was made possible by comprehensive multi-object opticalspectroscopy obtained with the Hectospec and DEep Imaging Multi-ObjectSpectrograph instruments on the 6.5m MMT and 10m Keck II telescope,respectively. These observations produced 956 and 400 spectroscopicallyconfirmed cluster members within a projected radius of 3Mpc from the centers ofAbell 2142 and RXJ1720.1+2638, respectively. The substructure manifests itselfas local peaks in the spatial distribution of member galaxies and also asregions of localized velocity substructure. For both Abell 2142 andRXJ1720.1+2638, we identify group-scale substructures which, when consideringthe morphology of the cold fronts and the time since pericentric passage of aperturber estimated from the cold front radii, could plausibly have perturbedthe cluster cores and generated the cold fronts observed in Chandra images. Theresults presented here are consistent with cold fronts being the result ofmerger activity and with cold fronts in relaxed appearing clusters being due tominor merger activity.

Minor merger-induced cold fronts in Abell 2142 and RXJ1720.1+2638