Abstract
This paper uses an intensity database (parallel paper) to generate first traditional attenuation equations, and second, a model for the conditional excedeence probability of a level of seismic intensity, given distance to a site and the epicentral intensity. The latter model is comprised of mixed discrete-continuous joint probability distributions. The conditional distribution of distance for a given intensity or intensity difference is continuous and is represented by a lognormal distribution. The distribution of intensities is discrete and is represented by bi-modal Poisson functions. The bi-modal representation may be due to wave reflections at the boundary between the lithosphere and the asthenosphere, in the region. Two models are proposed, one for subduction earthquakes and the other for shallow earthquakes. The models are applied to Colombia and Western Venezuela.
Original language | Spanish |
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Pages (from-to) | 183-196 |
Journal | Revista Internacional de Desastres Naturales, Accidentes e Infraestructura Civil |
Volume | 11 |
Issue number | 2 |
State | Published - 2011 |
Keywords
- probability distributions
- seismic attenuation
- seismic intensity