Electronic Supplement to
The Relationship between Ambient Vibration H/V and SH Transfer Function: Some Experimental Results

by El Hadi Oubaiche, Jean-Luc Chatelain, Mustapha Hellel, Marc Wathelet, Djamel Machane, Rabah Bensalem, and Abderrahmane Bouguern

Table S4. Velocity Contrasts between the Soft and Stiff Sediment Layers with Relative Frequency Differences in the Soft-Sediment Layer

Drilling Number	Vstiff (m/s)	Vstiff/VD	Vstiff/VT	ΔfT/fHV (%)	ΔfD/fHV (%)	ΔfSH/fHV (%)	ΔfE/fHV (%)	σHV/fHV (%)
1	930	2.56	2.84	3 ± 13	7 ± 15	14 ± 16	62 ± 22	14
2	650	2.15	2.36	12 ± 11	3 ± 12	3 ± 12	42 ± 17	12
3	650	2.46	2.85	6 ± 16	11 ± 19	33 ± 22	44 ± 24	17
4	1364	3.98	4.46	18 ± 5	6 ± 6	9 ± 5	12 ± 5	6
5	550	2.29	2.47	8 ± 12	0 ± 13	8 ± 13	30 ± 16	13
6	770	2.66	3.07	4 ± 12	12 ± 13	20 ± 14	20 ± 14	12
7	600	1.69	1.78	15 ± 11	11 ± 11	0 ± 13	13 ± 11	13
8	900	1.97	2.18	3 ± 19	6 ± 21	0 ± 19	0 ± 19	19
9	800	3.02	3.64	6 ± 5	14 ± 6	19 ± 7	14 ± 6	6
Average	–	–	–	8 ± 4	8 ± 4	12 ± 8	26 ± 16	12 ± 3

V_stiff, underlying sandstone layer velocity; V_D, V_T, surficial soft-sediment depth-averaged and time-averaged shear-wave velocity. Relative frequency differences and their standard deviations for shear-wave time-averaged (Δf_T/f_HV) and depth-averaged (Δf_D/f_HV) velocities, Rayleigh-wave ellipticity (Δf_E/f_HV), and SH transfer function (Δf_SH/f_HV), with Δf_N = |f_N − f_HV| and horizontal-to-vertical spectral ratio (HVSR) relative standard deviation (σ_HV/f_HV). The last line of the table shows the average of the relative frequency differences.

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