An Investigation on Soil Amplification through Site Factors Used in Seismic Design Codes

Table 2

Number of accounted acceleration records for the short period (S_S) region.

Local site classes	Spectral acceleration groups
	0.1	0.25	0.50	0.75	1.00	1.25	1.50
Reference	70	378	182	266	126	42	42
ZB	90	486	234	342	162	54	54
ZC	225	1215	585	855	405	135	135
ZD	90	486	234	342	162	54	54
ZE	45	243	117	171	81	27	27
ZF	45	243	117	171	81	27	27

Group not included in the codes.