At 22:45 UTC in Switzerland and earthquake was felt, information from EMSC on this earthquake can be found here. The size of this earthquake was ML4.2 with the depth of 32 km. This was an tectonic earthquake, as Italy continues to push up into Europe plate. Earthquakes are frequent in this area, on both sides of the Alps. This is not the strongest earthquake that can happen in this area.
It is also important factor that most of the crust in this area is old, so it carries seismic waves better then young crust. This happens because older crust is more insulated with dirt and sediment that has been collected over time period of million of years.
From best to my knowledge, no aftershocks have taken place after this earthquake. But they might happen in several weeks to months time, if they do so to start with.