Abstract
Fecha de entrega: 18 de enero 2012 Fecha de aceptacion: 5 de junio 2012 We perform microtremors measurements at Concepcion and compute the predominant frequency using horizontal-to-vertical spectral ratio (HVSR). We compare these results with the surface geology and several geotechnical surveys existing in the region, enabling a general characterization of the area. We present and complement these results with observations of damage produced by the M w 8.8 Maule 2010 earthquake. Preliminary results show the presence of fine-grained materials in the area characterized by very low predominant frequency (lower than 1.5 Hz), which might explain the extensive damage observed at Concepcion and surroundings.
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