The offshore platform VEGA-A is a fixed eight-legged structure that has been operating from 1988 in the Sicily channel. In the platform, there is an environmental and structural monitoring system installed within. In September 2015 the processing mode of the acquired data on the platform was changed, in order to establish their representativeness in relation to the structural control of the platform. The present work presents the results of the new data processing provided by the monitoring system, which performs the spectral analysis and dynamic identifications, in particular, will be obtained by the frequencies of oscillation in order to find a variation of them during the life of the platform. The variation of forms and periods of oscillation on its own can be related to damage to the structure or a variation of own loads. The scope includes a statistical analysis of the accelerometric signals in order to identify important events and for the warning thresholds and alarm. These results are then compared with data from the project in accordance with the storms that have affected the structural system.