Fig. 7

Example of time evolutions of x displacements for stories 1, 4, 8 with SNR\(=15\) dB (from  a–f) and SNR\(=10\) dB (from g–l), undamaged state. Low-noise case: \(f_{1,2}^{sh}=\left( 21.1, 69.2 \right) \), \(\gamma _{1,2}^{sh}=\left( -0.058,-0.199\right) \). High-noise case: \(f_{1,2}^{sh}=\left( 14.5, 2.36 \right) \), \(\gamma _{1,2}^{sh}=\left( 0.025,-0.159\right) \). Orange lines represent \({\varvec{u}}\), whereas black lines stand for \({\varvec{r}}\), according to Eq. (2). On the right side, a closer view for each left side plot is reported