Type | Proceeding | ||||||||||
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Title | Assessment of strong ground motion variability in Iceland | ||||||||||
Authors | Ornthammarath, T.; Douglas, J.; Sigbjörnsson, R.; Lai, C. G. | ||||||||||
Book Title | Proceedings of 14th European Conference on Earthquake Engineering | ||||||||||
Year | 2010 | ||||||||||
Number | 1263 | ||||||||||
Abstract | The large aleatory variability associated with ground-motion prediction equations (GMPEs), which are used in probabilistic seismic hazard analysis (PSHA), have a great influence on the assessed intensity measures (IMs) particularly at long return periods. Therefore, efforts to reduce (even by only a few percent) the aleatory variability (measured for instance by standard deviation σ) associated with GMPEs are meritorious. A reduction of σ associated with GMPEs could eventually lead to a significant decrease in seismic demand estimates. Aleatory variability in earthquake ground motions in Iceland are separated here into source (inter-event), site (inter-site) and residual (intra-event and intra-site) effects by using various techniques that have been proposed in the literature over the past couple of decades, e.g. maximum likelihood regression, analysis of variance and two- way-fit plots. Better insight into the source of σ could be used to improve current GMPEs employed in the South Iceland Seismic Zone (SISZ). The study is carried out by exploiting the strong-motion datasets available from moderate earthquakes (Mw 5.0-6.5) that have occurred in the SISZ in the past decade. | ||||||||||
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Access | Public |
No | Name | Property | Value | Validity Conditions | |||
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1. | Ornthammarath et al. (2010) | PGA | ƒ(Vs30, Mw, df) m/s2 | Mw: 5.1–6.5; h: 10–15 km; FM: Strike-slip; df: < 80 km | 2 | - | - |
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