Correlación entre la forma de la razón espectral H/V con la estratigrafía del subsuelo en 10 sitios de estudio
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Fecha
2018-06-29
Tipo
artículo original
Autores
Fonseca Hidalgo, Juan Carlos
Schmidt Díaz, Víctor
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Resumen
Es posible que al aplicar la técnica de la razón espectral para vibraciones ambientales no se
logren identificar picos bien definidos que se asocien a contrastes significativos entre el suelo
y el basamento. Sin embargo, la forma de este gráfico puede aportar otra información valiosa
sobre distintas características del perfil de suelo, como inclinación del basamento, inversión de
velocidades de onda cortante entre estratos sucesivos de suelo, homogeneidad de los materiales,
etc. Esta investigación pretende correlacionar las formas de los gráficos de las razones espectrales
con información geofísica disponible en 10 sitios debidamente caracterizados, tomando
en cuenta conclusiones a las que han llegado otros autores. Para lograrlo, se tomaron registros
de vibraciones ambientales por medio de un sismógrafo triaxial colocado en cada sitio, y se
calculó la razón del promedio de los espectros horizontales entre el vertical. Posteriormente, se
correlacionó la forma de este gráfico con la estratigrafía reportada según estudios geotécnicos y
se lograron identificar cuatro formas del gráfico: pico definido, pico ancho, doble pico y plano.
Once the horizontal to vertical technique is applied to ambient vibrations, it is possible that peaks are not well identified. These peaks are usually associated to significant contrasts between soil and bedrock, and this condition may not be presented in all sites. However, the shape of graphics could give additional valuable information about specific characteristics of the soil profile, such as: slope of the bedrock, inversion of shear velocities between successive soil layers, homogeneity of materials, etc. This research intends to correlate the shape of the H/V graphics with the available geophysical information for 10 previously characterized sites. Similar studies proposed by other authors are considered. Ambient vibrations were registered using a triaxial seismograph. The ratio of the averaged horizontal to vertical spectra were obtained. These plots were related to the site stratigraphy and four cases were well identified: pointed peak, wide peak, double peak and flat graph.
Once the horizontal to vertical technique is applied to ambient vibrations, it is possible that peaks are not well identified. These peaks are usually associated to significant contrasts between soil and bedrock, and this condition may not be presented in all sites. However, the shape of graphics could give additional valuable information about specific characteristics of the soil profile, such as: slope of the bedrock, inversion of shear velocities between successive soil layers, homogeneity of materials, etc. This research intends to correlate the shape of the H/V graphics with the available geophysical information for 10 previously characterized sites. Similar studies proposed by other authors are considered. Ambient vibrations were registered using a triaxial seismograph. The ratio of the averaged horizontal to vertical spectra were obtained. These plots were related to the site stratigraphy and four cases were well identified: pointed peak, wide peak, double peak and flat graph.
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Palabras clave
Razón espectral H/V, Suelos, Basamento, Amplificación, Ondas superficiales, H/V spectral ratio, Soil, Bedrock, Amplification, Surface waves