Figure 3 Relaxation models adapted to the frequency recovery of buildings for the different periods defined in Figure 2.
a , Normalized frequency variation over recovery time according to the model proposed by Ref. 24. Here, a and G are proxies for elasticity. \(m=\log\left(\frac{t}{\tau}\right)\). b,Normalized frequency variation over the recovery time according to the relaxation function of Ref. 22. Here, τmaxmin is the ratio between the final and initial relaxation times computed from the model. c,Relaxation spectra proposed by Ref. 23.