The Sacred Mountain of Varallo in Italy: Seismic Risk Assessment by Acoustic Emission and Structural Numerical Models

Table 7

Natural frequencies of the first 20 calculated modes of vibration of Chapel XVII and percentages of mass involved in each mode of vibration for directions 𝑋 and 𝑌 in the horizontal plane.

Mode	Frequency (Hz)	Period (s)	𝑋 direction		𝑌 direction
			%	Cumulated%	%	Cumulated%
1	4.737	0.211	5.31𝐸+01	5.31𝐸+01	5.89𝐸−05	5.89𝐸−05
2	5.162	0.194	5.82𝐸−05	5.31𝐸+01	4.97𝐸+01	4.97𝐸+01
3	8.570	0.117	5.94𝐸−02	5.32𝐸+01	2.61𝐸−07	4.97𝐸+01
4	9.891	0.101	1.20𝐸−01	5.33𝐸+01	1.43𝐸−05	4.97𝐸+01
5	10.087	0.099	1.50𝐸−05	5.33𝐸+01	1.95𝐸−01	4.99𝐸+01
6	13.192	0.076	3.37𝐸+00	5.67𝐸+01	4.59𝐸−06	4.99𝐸+01
7	13.373	0.075	1.68𝐸−04	5.67𝐸+01	2.85𝐸−01	5.02𝐸+01
8	13.881	0.072	6.60𝐸+00	6.33𝐸+01	5.39𝐸−06	5.02𝐸+01
9	14.479	0.069	6.48𝐸−05	6.33𝐸+01	9.44𝐸+00	5.96𝐸+01
10	14.616	0.068	1.13𝐸−04	6.33𝐸+01	3.83𝐸+00	6.35𝐸+01
11	15.633	0.064	2.65𝐸−05	6.33𝐸+01	3.31𝐸−01	6.38𝐸+01
12	17.402	0.057	2.36𝐸−02	6.33𝐸+01	5.14𝐸−06	6.38𝐸+01
13	17.612	0.057	3.66𝐸−06	6.33𝐸+01	5.25𝐸−02	6.38𝐸+01
14	18.031	0.055	5.02𝐸−01	6.38𝐸+01	1.91𝐸−05	6.38𝐸+01
15	18.677	0.054	2.45𝐸−04	6.38𝐸+01	1.28𝐸−01	6.40𝐸+01
16	18.750	0.053	9.08𝐸−02	6.39𝐸+01	1.67𝐸−04	6.40𝐸+01
17	19.165	0.052	6.71𝐸−02	6.40𝐸+01	1.91𝐸−05	6.40𝐸+01
18	19.874	0.050	3.13𝐸−09	6.40𝐸+01	2.02𝐸−01	6.42𝐸+01
19	20.545	0.049	4.58𝐸−01	6.44𝐸+01	7.58𝐸−06	6.42𝐸+01
20	21.578	0.046	5.79𝐸−06	6.44𝐸+01	5.48𝐸−01	6.47𝐸+01