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The geometric properties of spacetimes representing expanding impulsivegravitational waves, propagating on a flat background and generated by snappedcosmic strings, are studied. The construction of the line element is reviewed,and suitable forms of the string-generating complex mapping are derived forvarious configurations such as previously studied examples of a pair ofsnapping cosmic strings. Moreover, these mappings are related to the topologyof the flat half-space in front of the wave. Their understanding seems to becrucial for further analysis of the global geometry, the relation betweenhalf-spaces on both sides of the impulse, and the physical interpretation of,in principle, observable effects. The spacetime structure is connected with themotion of free test particles crossing the impulse, where the recent resultsallow us to discuss their displacement and induced velocities that are causedby the interaction with the expanding gravitational impulsive wave.

An interpretation of spacetimes with expanding impulsive gravitational waves generated by snapped cosmic strings