The current paper presents the first part of a study in progress devoted to analyse the St. Gemma church in Goriano Sicoli, which has been seriously damaged by the 2009 L’Aquila earthquake. Firstly, the main effects provoked by L’Aquila Earthquake on ancient historical centres, with particular regard to buildings belonging to the cultural heritage, are described. Then, the St. Gemma church is investigated in detail. The main geometry and structural details of the church are shown and damage occurred during to the seismic event of 6.04.09 is critically analysed and discussed. Finally, the main outcomes of dynamic tests carried out on the damaged church, in order to detect its main natural frequencies and mode shapes, are provided.