Abstract

FLORES ESTRELLA, Hortencia; CARDENAS SOTO, Martín  and  LOMNITZ, Cinna. Respuesta sísmica en el Lago de Texcoco: Resultados a partir de registros de movimientos fuertes. Ing. sísm [online]. 2009, n.81, pp.37-51. ISSN 0185-092X.

In 1995 an accelerometer array was installed, it consisted on six surface stations which formed two triangles with distances of 30 and 400 m between them, and a vertical array with instruments in five depths. The database is formed by eight strong motion records (5.9 <M <7.9), which were analyzed to estimate the seismic response, to obtain a velocity model for the clay layer and to calculate the response site spectra. The site response is characterized by the fundamental frequency on 0.37 Hz. and an amplification factor around. The shear velocity model was obtained from the analysis to the seismic records from the borehole; this model consists on two layers with a Q factor estimation for each of them. The transfer function for this model is dominated by the dynamic amplification, due to the lacustrine clay layer and its physical properties, and it is close to the empirical transfer function obtained from spectral ratios. The response spectra estimation shows two intervals with maximum seudoacceleration: between 0 and 1 sec and between 2 and 3 sec, with spectral ordinates of 0.6 and 0.74 g, respectively.

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