Seismic load estimates of distant subduction earthquakes affecting Singapore

Abstract

This paper introduces the use of a simple stochastic model for predicting elastic response spectra of 5% damping for structures founded on rock sites in Singapore based on earthquake scenarios of moment magnitude Mw = 9 - 9.5 generated from the Sunda-Arc subduction source at a closest distance of 600 km. Structures founded directly on rock are predicted to be subject to low response spectral accelerations of up to 1.3% gravitational acceleration. The maximum velocity demand on a structure is estimated to be in the order of 50 mm/s. The drift demand on a structure is estimated to be generally low but can be up to some 80 mm on single-degree-of-freedom systems possessing a high natural period ..