Pontificia Universidad Católica de Chile Pontificia Universidad Católica de Chile

Combining active and passive multichannel analysis of surface waves for seismic soil classification through Vs30

Revista : Proceedings of Vienna Congress on Recent Advances in Earthquake Engineering and Structural Dynamics
Número : Paper 325
Tipo de publicación : Conferencia No DCC


Surface wave methods are commonly used for seismic soil classification, however, their indirect nature implies a degree of uncertainty that needs to be described and constrained. Surface waves response is analyzed using active and passive sources. In passive test, linear and circular arrays were used. The f-k analysis, SPAC method, and Roadside MASW were used to evaluate the dispersive characteristics of each site. Our results show that the exploration of the first 30 meters of soil is not a trivial process. To obtain a reliable shear wave depth-profile, is necessary to have a high energy source, or combine dispersion curves obtained with standard-energy active source, passive linear and circular arrays. Results obtained through passive linear test do not guarantee the 30 m of exploration, especially when there are no roads or street close to explored site. We test the reliability of this approach in three end-member soil conditions of the Santiago basin (Chilean capital).