Monitoring and Identification of Vibration Frequencies on a Portion of México City Metro Line 12

Table 3

Identified frequencies and standard deviation by section in column 5 calculated for period before and after significant events.

Date period	Recursive N4SID		Recursive MOESP		Spectral analysis
04/08/12–09/05/13	2.18	5.43	2.08	5.43	2.14	5.35
30/10/13	2.30	5.65	2.27	5.65	2.24	5.60
21/04/14–22/04/14	2.22	5.62	2.21	5.71	2.19	5.61
12/05/15–31/08/15	2.30 ± 0.04	5.71 ± 0.06	2.28 ± 0.14	5.75 ± 0.08	2.32 ± 0.01	5.66 ± 0.05
01/11/15–10/11/16	2.32 ± 0.04	5.60 ± 0.04	2.29 ± 0.10	5.60 ± 0.16	2.34 ± 0.03	5.58 ± 0.04
11/11/16–30/08/17	2.32 ± 0.04	5.60 ± 0.03	2.27 ± 0.11	5.60 ± 0.10	2.34 ± 0.03	5.57 ± 0.03
01/09/17–19/09/17	2.32 ± 0.04	5.65 ± 0.04	2.30 ± 0.11	5.68 ± 0.06	2.34 ± 0.03	5.61 ± 0.03
20/09/17–30/09/17	2.25 ± 0.03	5.59 ± 0.03	2.22 ± 0.07	5.67 ± 0.17	2.30 ± 0.02	5.57 ± 0.03
01/10/17–30/01/18	2.27 ± 0.04	5.58 ± 0.03	2.26 ± 0.13	5.60 ± 0.15	2.32 ± 0.02	5.54 ± 0.03
01/02/18–16/02/18	2.28 ± 0.02	5.57 ± 0.05	2.28 ± 0.08	5.57 ± 0.09	2.31 ± 0.02	5.54 ± 0.03
17/02/18–28/02/18	2.29 ± 0.02	5.56 ± 0.04	2.32 ± 0.07	5.56 ± 0.11	2.30 ± 0.03	5.53 ± 0.03