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A significant fraction of clusters of galaxies are observed to havesubstructure, which implies that merging between clusters and subclusters is arather common physical process of cluster formation.  It still remains unclear how cluster merging affects the evolution of clustermember galaxies.  We report the results of numerical simulations, which show the dynamicalevolution of a gas-rich late-type spiral in a merger between a small group ofgalaxies and a cluster. The simulations demonstrate that time-dependent tidalgravitational field of the merging excites non-axisymmetric structure of thegalaxy, subsequently drives efficient transfer of gas to the central region,and finally triggers a secondary starburst.  This result provides not only a new mechanism of starbursts but also a closephysical relationship between the emergence of starburst galaxies and theformation of substructure in clusters. We accordingly interpret post-starburstgalaxies located near substructure of the Coma cluster as one observationalexample indicating the global tidal effects of group-cluster merging.  Our numerical results furthermore suggest a causal link between the observedexcess of blue galaxies in distant clusters and cluster virialization processthrough hierarchical merging of subclusters.Comment: 5 pages 3 color figures, ApJL in pres

Group-Cluster Merging and the Formation of Starburst Galaxies