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El objetivo del presente trabajo es evaluar el efecto de sitio del terreno donde se ubica la estación acelerográfica de SENCICO-AREQUIPA (AQP003). Para tal fin, se aplica la conocida técnica de cociente espectral H/V utilizando los registros de aceleración registrados durante los meses de agosto y septiembre del 2016.

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Viernes, 14 Marzo 2014 16:33

Informe del sismo del 22 de febrero de 2014

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El 22 de febrero de 2014 a las 12:26:40 UTC-5 (hora local), ocurrió un sismo 21 km al NO de Lima Metropolitana (Fuente: IGP). Las características sísmicas del evento se resumen en la Tabla 1 y la ubicación del epicentro se muestra en la Figura 1.

The present study aims to examine thoroughly the relation between the local site effects and the local subsurface conditions in Lima city, due to the fact that there is little information related to the seismic amplification in this city. Using ground motion records, the amplification effects are studied empirically, in the frequency range from 0.1 to 20 Hz. This study analyzes the seismic events observed along the Pacific coast of Lima city, which were recorded by 10 stations.

The yield strength ratio concept, Su(yield)/σ’vo (Olson & Stark, 2003) and the cyclic strength ratio CRR (Seed et al, 1984) remain the main approaches of assessing triggering of liquefaction resistance for sloping ground. The Kα correction factor (Seed, 1983) has been extensively studied for considering the effect of the initial static stress on the triggering of liquefaction of sloping ground. Based on a suite of liquefaction triggering analyses, these most-commonly used cyclic stress methods, Seed et al. (2003)/Cetin et al. (2004) and Idriss and Boulanger (2008), are compared to the yield strength ratio approach (Olson and Stark 2003; Olson et al. 2006; Mesri 2007; and Olson and Zitny 2012), and the efficacy of the yield strength ratio is demonstrated. For validation of the comparison, one Mw 7.0 Haiti (2010) earthquake flow failures cases (North River near Dechapelle), (Olson et al., 2010) was selected to estimate the triggering of liquefaction and post-liquefaction resistance.

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