Candelario-Cosme, Manuel E.

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    Uso de microtemblores para determinar los periodos fundamentales en Ponce, Puerto Rico: aplicación del método de Nakamura y los Espectros de Potencia de Densidad Espectral
    (2013-05) Candelario-Cosme, Manuel E.; Suárez, Luis E.; College of Engineering; Martínez Cruzado, José A.; Huerta, Carlos I.; Pando, Miguel A.; Department of Civil Engineering; Huérfano Moreno, Víctor
    A significant portion of the damage caused by earthquakes worldwide is associated with the amplification of seismic waves due to local site effects. The evaluation of local site effects is done with site response analyses in order to determine the dynamic properties of the subsurface such as the dominant period of the soils. One way to determine these properties is through the direct analysis of ground motions. In locations with low seismicity, it is more convenient to use microtremor readings. The term microtremor refers to ambient vibrations of the ground caused by human activities or by atmospheric disturbances. Processing microtremors records with the H/V spectral ratio technique or Nakamura’s method, it is possible to obtain the fundamental natural periods without the need of additional geological information. As part of this thesis, 140 ambient vibration measurements were carried out in the city of Ponce, in Southern Puerto Rico. With the data gathered, an isoperiod map was generated for this municipality. Nakamura’s method is compared with the Power Spectral Density technique and the advantages and limitations of each procedure are discussed.