Using three models i.e.bottom-layer constant velocity model,velocity gradient model and the extrapolation model with the travel-time averaged shear-wave velocities at two different depths,we investigated the data from 460 boreholes in Beijing plain area in which the shear-wave velocity profile reaches over 30m.Through the detailed research,we found that the last method can estimate Vs30 with high accuracy,which does not need any regression analysis to derive empirical relations from a large number of data.Meanwhile,this method is not regionally dependent,and has a remarkable improvement in the accuracy.Therefore,it is potentially useful for many parts of the world including Beijing.It provides a basis for site classification,and then can extend the application to evaluation of site effect in a rapid assessment of earthquake damage,thus being worth to be extensively applied.
Equivalent shear wave velocitySite conditionExtrapolation models of Vs30Beijing plain area
NETL
NSTL
万方数据
维普
