Variability in Response Spectra for Crustal Earthquake using Stochastic Green's Function Approach

Abstract

In this paper, the variability in the acceleration response spectra (h=5%) due to the variability of the source parameters for shallow crustal earthquakes is investigated. Firstly, the finite fault models of the past crustal earthquakes in Japan are compiled and statistically investigated. Secondly, ground motions are simulated at several receivers for different events using the stochastic Green's function approach, where events have different asperity distribution and hypocenter location. Then, the variance of the acceleration response spectra is evaluated. The variance increases as the period of the response spectra increases. Finally, effects of other source parameters are also evaluated. The variance of the simulation results is comparable to the inter-event error in an attenuation relationship, suggesting that the inter-event error can be explained by the effects of variability in the source parameters.