Una semana posterior al sismo de magnitud 7,9 en la Costa Central del Perú, con epicentro a 60 km de la ciudad de Pisco y a 26 km de profundidad, se realizó un monitoreo en las ciudades de Ica y Pisco con varios objetivos: evaluar el efecto de sitio, caracterizar los suelos encontrados para su clasificación y proponer mapas de clasificación para las ciudades de Ica, Pisco y Lima. La investigación usó registros de las réplicas de terremotos obtenidos con tres acelerógrafos y tres sismógrafos. Para Ica se obtuvo más de 25 réplicas, dentro de la zona urbana. Para Pisco se obtuvo 29 réplicas en siete lugares, también de la zona urbana. Para la zona conurbada de Lima y Callao se utilizó los registros del sismo principal en 14 estaciones acelerógraficas. El presente trabajo se realizó del 21 al 26 de agosto del 2007 con un equipo de trabajo conformado por el CISMID, el INGEMMET...

Strong motion records are important for improving seismic design, damage assessment and analysis of earthquake effects. Despite the relevance of having strong motion networks, their implementation in Peru has been performed in the very recent years. For instance, only five strong motion stations in Lima recorded the 2007 Mw 7.9 Pisco earthquake, whereas 55 stations recorded the 2021 Mw 6.0 Mala earthquake. The current number of instrumentations in Lima city provides an opportunity to improve soil characterization. This study aims to determine the dominant frequency (fd) of the seismic stations located in Metropolitan Lima. The procedure we adopted, first considered collecting, for an arbitrary station, all the available events recorded from 2011-2021, including the 2007 Mw 7.9 Pisco earthquake. Then, the pseudo spectral acceleration, using 5% damping, for each component were computed, an...

In recent years, the development of seismic networks in Metropolitan Lima, administrated by public and private institutions, has received special attention since it makes possible the quantification of different seismic indexes under the occurrence of earthquakes. Therefore, the integration of the information both from acceleration sensors and site conditions from microzoning studies allows the estimation of the possible extent of the damage in quasi-real time. In this study, the implementation of a system to evaluate seismic parameters in a uniform grid of 250 x 250 m2 resolution is reported. In this regard, peak ground acceleration (PGA) values from the available time-history records are computed and reduced to the engineering bedrock level. Then, by means of the interpolation technique called Ordinary Kriging, in which each seismic station is considered as a random variable and the co...