KEYNOTE ADDRESS:THE ROAD AHEAD FOR NEAR-SURFACE SEISMOLOGY

摘要

Applications of engineering seismology, earthquake seismology, and exploration seismology all require an an accurate model of the near-surface. I shall present results of elastic wavefield modelling of shot gathers using soil-column models with vertical and lateral velocity variations to study the dispersive behaviour of Rayleigh waves and the effect of lateral heterogeneity on the accuracy of Rayleigh-wavc inversion for shear-wave velocity estimation. I shall also present the results of a field experiment over an alluvial valley with soil column that thins out in the direction orthogonal to the valley axis. From the model and field experiments, we found that the dispersion characteristics of Rayleigh waves is greatly influenced by the geometry of and lateral heterogeneities within the soil column.