The invention falls within the field of the techniques for manufacturing seismic monitoring systems and is applicable to structures related to civil engineering. A seismic monitoring system (1) is implemented by the method according to the present invention which includes a set of equipment (such as accelerometric sensors (2a, 2b) and an acquisition unit (3); the accelerometric sensors (2a, 2b) measure at predetermined instants, with a predetermined frequency, the acceleration values of the points of the structure (11) at which said accelerometric sensors are positioned; each of the one or more acquisition units (3) comprises, in addition to a RAM memory, a mass memory in which at least part of the data measured by the accelerometric sensors (2a, 2b) connected to said acquisition unit and transmitted by said accelerometric sensors to said acquisition unit is stored; said seismic monitoring system (1), if said structure (11) is subjected to seismic actions, is adapted to be used to detect, after the seismic event, by processing the measured data, in addition to the accelerations, also the displacements of the points of said structure (11) at which the accelerometric sensors (2a, 2b) are positioned.
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