Gaussian-filtered Horizontal Motion (GHM) plots of non-synchronous ambient microtremors for the identification of flexural and torsional modes of a building

The methodology is first introduced by considering a case study where synchronous microtremor data are also recorded. In a second case study, the method is applied to non-synchronous microtremor data collected at a 25-storey building and results are compared with the numerical simulations performed by means of the Finite Element Method (FEM).