El mayor sismo que haya afectado a la ciudad de Valdivia con posterioridad al famoso terremoto de 1960 fue el generado por el evento (Mw 8,8) del 27 de febrero de 2010 en la zona central de Chile. La intensidad asignada para la ciudad de Valdivia alcanzó el valor VI en la escala de Mercalli. Con el objeto de comprender la distribución espacial de los daños a la infraestructura urbana, se relacionó ésta con las condiciones locales de suelo. Los antecedentes de la historia sísmica y del desarrollo urbano de Valdivia proporcionan información valiosa que se agregó al análisis. La diferente severidad con la que el sismo repercutió en los diversos barrios de Valdivia, guarda una estrecha relación con las unidades geomorfológicas y los tipos de suelos de fundación existentes en la ciudad. Se pudo establecer una buena coincidencia con la respuesta sísmica de los suelos prevista para la ciudad en estudios previos.
An area between the mouth and 3.5 km upstream was seasonaly sampled, N, order to analyze in detail and from a dynamic viewpoint the sedimentary facies spatial distribution and the organic matter content of the present sediments of the Queule River Estuary.Grain size analyses were determined by the combined sieve and pipette method, and the content of carbon organic matter was determined by ignition. Granulometric parameters of mean size, sorting and skewness were calculated by the method of statistical moments.Tfn textural facies in summer and nine in winter were distinguished in the estuary. In the time between summer and winter samplings, facies were affected by changes in their spatial distribution, N1 response to the energy leve1 variations in the estuary. The distribution of carbon
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