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Article |
Departamento de Física Teórica y del
Cosmos
Facultad de Ciencias
Universidad de Granada
Campus
Universitario Fuentenueva s/n
18071 Granada, Spain
(C.L.C.)
Instituto Andaluz de Geofisica y Prevención de Desastres
Sísmicos
Campus Universitario de Cartuja s/n
18071 Granada,
Spain
(C.L.C.)
Departamento de Ciencias de la Tierra y del Medio
Ambiente
Facultad de Ciencias
Universidad de Alicante
Ap. Correos 99,
03080 Alicante, Spain
(SMP, J.D.)
Departamento de Física Aplicada, Escuela
Politécnica Superior
Universidad de Jaén
Virgen de la
Cabeza, 2, 23071 Jaén, Spain
(J.A.P.)
We have classified the attenuation of the Medveded, Sponheuer, and Karnik (MSK) intensity into five types (each as a function of the epicentral intensity Io) based on the mean radii of 254 isoseismal maps, mainly historical earthquakes in the Iberian Peninsula. Geographically representing each earthquake with its corresponding attenuation tendency, it can be seen that those with low attenuation lie west of the Peninsula and those with high attenuation in the south and east. This regionalization seems to be due as much to the seismotectonic characteristics (different crustal types and size of the earthquakes) as to the different construction types in each region. These attenuation values are similar to those of southern Europe, but much higher than those found in the United States. From the point of view of seismic-hazard evaluation, these laws represent an improvement with regard to those used so far. We have extended previous attenuation studies to the whole of the Iberian Peninsula, and, in some points, differences of attenuation assignment of almost two degrees of intensity have been corrected.
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