Report on the 18th International Symposium on Geo-disaster Reduction and the 4th Gu Dezhen Lecture, 20-22 November 2020, Beijing, China.

The 18th International Symposium on Geo-disaster Reduction (ISGdR) was held on 20-22 November in Beijing, China, focusing on the theme of "Improving the Relationship between Geoenvironment and Society". In this symposium, a high-level Gu Dezhen Lecture and a number of keynote and invited lectures provided a platform for scientists, industrial professionals and students to share their researches and exchange novel ideas on geo-disaster reduction in a hybrid way of offline and online.

Spectral analysis of layered sites using shaking table tests.

The dynamic response analysis of horizontal and inclined layered sites using large-scale shaking table tests in various directions, including the dip direction, strike, vertical direction, slope direction and direction perpendicular to the interface of layered sites is conducted in this study. The Fourier spectrum and response spectrum characteristics in the horizontal site are first investigated in this study, and the dynamic responses of the inclined layered sites are then studied and compared to the corresponding responses of the horizontal layered site. The influence of dip angle on the response spectrum is also studied.