To obtain the information about the vulnerability of seismic stability of construction objects, we propose technologies and systems for the analysis of noisy signals received during weak earthquakes (which are typically more frequent than strong ones) from sensors installed in the most informative spots of a structure. It has been demonstrated that, during weak earthquakes, such estimates as noise variance, noise correlation value and cross-correlation function between the useful signal and the noise turn out to be stable values in the case of intact seismic stability of a building structure....