Abstract
Measurement of ground motion variability is essential to estimate seismic hazard. Over-estimation of variability can lead to extremely high annual hazard estimates of ground motion exceedance. We explore different parameters that affect the variability of ground motion such as the spatial correlations of kinematic rupture parameters on a finite fault and the corner frequency of the moment-rate spectra. To quantify the variability of ground motion, we simulate kinematic rupture scenarios on several vertical strike-slip faults and compute ground motion using the representation theorem. In particular, for the entire suite of rupture scenarios, we quantify the within-event and the between-events ground motion variability of peak ground acceleration (PGA) and response spectra at several periods, at 40 stations—all approximately at an equal distance of 20 and 50 km from the fault. Both within-event and between-events ground motion variability increase when the slip correlation length on the fault increases. The probability density functions of ground motion tend to truncate at a finite value when the correlation length of slip decreases on the fault, therefore, we do not observe any long-tail distribution of peak ground acceleration when performing several rupture simulations for small correlation lengths. Finally, for a correlation length of 6 km, the within-event and between-events PGA log-normal standard deviations are 0.58 and 0.19, respectively, values slightly smaller than those reported by Boore et al. (Earthq Spectra, 30(3):1057–1085, 2014). The between-events standard deviation is consistently smaller than the within-event for all correlations lengths, a feature that agrees with recent ground motion prediction equations.
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This work has been sponsored by the National Research Center for Integrated Natural Disaster Management (CIGIDEN), CONICYT/FONDAP 15110017.
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Crempien, J.G.F., Archuleta, R.J. (2018). Within-Event and Between-Events Ground Motion Variability from Earthquake Rupture Scenarios. In: Dalguer, L., Fukushima, Y., Irikura, K., Wu, C. (eds) Best Practices in Physics-based Fault Rupture Models for Seismic Hazard Assessment of Nuclear Installations. Pageoph Topical Volumes. Birkhäuser, Cham. https://doi.org/10.1007/978-3-319-72709-7_8
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DOI: https://doi.org/10.1007/978-3-319-72709-7_8
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