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Determining the behaviour of a structure estimated by means of finite elements analysis requires, not only an in depth knowledge of its geometry and dynamic properties, but also an experimental validation to corroborate the adequacy of the characteristics of the structure. Most of the current structural identification techniques are based on linear methods that call for a lot of measurement points and/or a relative simple structure. Complex structures are somewhat still an unexplored field due to the difficulties with the finite element method and the experimental corroboration of its results. In this work we present the use of particle motion computation applied to each structural vibration mode to improve the identification of its dynamic properties, and its application to the Gothic Cathedral of Palma de Mallorca (Spain).