Laser interferometry is one of the most sensitive methods for small displacement displacement. This technique was successfully used in several fields of physics, giving very good performances also due to the large availability of optical components and high quality and relatively low cost laser sources. At the same time this technique is enough flexible to be effectively used in very different applications. In particular, in this paper, we present a laser interferometric system used to read the position of a free mirror to measure the local seismic noise. The performances of the interferometric system were analyzed in comparison with a standard accelerometer. The result are encouraging also if some problem, mainly connected with the sensibility a with the stability of the interferometric system have to be better studied.