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

Table 4

Identified frequencies and standard deviation by section in column 6 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	2.10	5.45	2.15	5.37
30/10/13	2.28	5.49	2.27	5.65	2.23	5.44
21/04/14–22/04/14	2.25	5.62	2.34	5.69	2.23	5.58
12/05/15–31/08/15	2.31 ± 0.04	5.64 ± 0.03	2.31 ± 0.13	5.65 ± 0.06	2.31 ± 0.04	5.62 ± 0.03
01/11/15–10/11/16	2.33 ± 0.04	5.60 ± 0.03	2.31 ± 0.09	5.62 ± 0.11	2.34 ± 0.04	5.58 ± 0.03
11/11/16–30/08/17	2.32 ± 0.03	5.60 ± 0.03	2.31 ± 0.11	5.62 ± 0.10	2.33 ± 0.03	5.59 ± 0.03
01/09/17–19/09/17	2.34 ± 0.02	5.66 ± 0.03	2.32 ± 0.11	5.68 ± 0.09	2.35 ± 0.03	5.64 ± 0.03
20/09/17–30/09/17	2.27 ± 0.02	5.59 ± 0.02	2.29 ± 0.09	5.61 ± 0.08	2.29 ± 0.02	5.60 ± 0.03
01/10/17–30/01/18	2.29 ± 0.04	5.59 ± 0.03	2.28 ± 0.08	5.61 ± 0.08	2.31 ± 0.02	5.57 ± 0.03
01/02/18–16/02/18	2.30 ± 0.04	5.59 ± 0.04	2.32 ± 0.08	5.61 ± 0.04	2.31 ± 0.02	5.57 ± 0.03
17/02/18–28/02/18	2.30 ± 0.02	5.56 ± 0.02	2.32 ± 0.09	5.58 ± 0.08	2.30 ± 0.03	5.56 ± 0.03