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

Table 1

Identified frequencies and standard deviation using ambient vibration record 2013.

Frequency	Spectral analysis (time-window 40 s)	N4SID	MOESP	Spectral analysis (time-window 10 s)
f1	2.19	2.21 ± 0.01	2.27 ± 0.001	2.26 ± 0.10
f2	5.71	5.64 ± 0.03	5.80 ± 0.004	5.58 ± 0.13