Estimating Site Characteristic Parameters of the Gobi Desert Region Using Seismic Noise

Table 3

Identification of ground types in China.

VS20 (m/s)	Ground types
	I0	I	II	III	IV
Vs20 > 800	0
800 ≥ VS20 > 500		0
500 ≥ VS20 > 250		5 m	≥5 m
250 ≥ VS20 > 150		3 m	3 m∼50 m	>50 m
VS20 ≤ 150		3 m	3 m∼15 m	15 m∼80 m	>80

Note. This table is from Chinese code: code for seismic design of buildings. The numerical intervals in the table represent the cover thickness.