Abstract:In this paper, the Yellow River terraces T0, T1, T2, T3, and T4 in Lanzhou basin, which are related to the distribution of construction projects, were divided on the basis of existing data, and 201 models of soil layers for seismic response were established. Surface ground motion parameters of the deposit terrace in Lanzhou basin, with 10% probability of exceedance in 50 years, were obtained. The correlation between the deposit terraces and the seismic ground motion parameters, such as peak acceleration Am and the characteristic period Tg of acceleration response spectrum, were analyzed. Results showed that the overburden thickness of terrace from T0 to T2 was positively correlated with the peak acceleration Am with 10% probability of exceedance in 50 years. The overburden thickness of T3 terrace and above had a significant decreasing effect on the increase of Am. Tg value increased with increasing overburden thickness of the terrace from T0 to T3, but no longer increased synchronously when the overburden thickness increased to a certain extent, indicating that the influence of overburden thickness of the terrace on Tg was limited. There was no relationship between elevation of terraces and surface ground motion parameters with 10% probability of exceedance in 50 years.