Cecilio Morales | Universidad Central de Venezuela (original) (raw)
Uploads
Papers by Cecilio Morales
Para conocer el valor de las velocidades de las ondas de corte promedio (Vs30), en la zona metrop... more Para conocer el valor de las velocidades de las ondas de corte promedio (Vs30), en la zona metropolitana de Mérida se adquirieron treinta y tres (33) sondeos sísmicos por el método de refracción por microtremores (microsismos) (ReMi). Los valores de velocidad obtenidos se correlacionaron con la geología de la zona y se compararon con resultados previos de otros autores. Los valores de velocidad Vs promedio obtenidos en la zona de estudio están en el rango de 180 a 1520 m/s y aplican las formas espectrales S1 y S2 de las normas COVENIN 1756-1:2001 en la zona sísmica 5. Estos suelos se clasificarían como tipo B, C y D según la especificación de IBC. ABSTRACT Shear wave velocities determination for the topmost 30 m from microearthquakes refraction, ReMi, of the Mérida metropolitan area. To determine shallow shear wave velocities (Vs30) in the Mérida metropolitan area, micro earthquake were recorded usin...
Boletin de Geología, Jun 1, 2015
Para contribuir con la microzonificación sísmica del área metropolitana de Mérida se realiza una ... more Para contribuir con la microzonificación sísmica del área metropolitana de Mérida se realiza una caracterización geofísica del suelo, aplicando métodos de ruido sísmico ambiental, gravimetría y sísmica de refracción, entre otros. A partir de la técnica de ruido sísmico ambiental se obtienen periodos fundamentales que oscilan entre 0,2 y 2 segundos, los cuales presentan una buena correlación con los espesores de los sedimentos, obtenidos a partir de la gravimetría, y cuyos valores varían entre 12 y 130 m. La sísmica de refracción, a través de 62 perfiles sísmicos, establece modelos de velocidades tanto para las ondas P como para las ondas S de las capas más superficiales, hasta una profundidad máxima de 15 m. Todos estos resultados sirven de base para elaborar el mapa preliminar de microzonas sísmicas que clasifica el área metropolitana en tres partes: la zona 1-1 representada por velocidades de ondas de corte (Vs) desde 350 hasta 650 m/s y espesores de sedimentos entre 0 y 60 m; la zona 1-2 con velocidades Vs desde 350 hasta 650 m/s y espesores de sedimentos de más de 60 m y la zona 2-1 con velocidades Vs iguales ó mayores a 650 m/s y con espesores de sedimentos de 0 a 60 m.
Revista de la Facultad de Ingeniería Universidad Central de Venezuela, Jun 1, 2011
Revista de la Facultad de Ingeniería Universidad Central de Venezuela, Jun 1, 2011
Revista de la Facultad de Ingeniería Universidad Central de Venezuela, Jun 1, 2011
ABSTRACT Under the seismic microzoning project of Caracas city, has been done since mid 90s seve... more ABSTRACT Under the seismic microzoning project of Caracas city, has been done since mid 90s several ambient noise measurements in order to determinate fundamentals periods of soil. In this work we showed a new relationship that includes the effect of the surface sediment layers, considering the values of shear-wave velocities for the first 30 m (Vs30) and the value of Vs to the deepest layer. The results indicate that this relationship generates more accurate estimates of sediment thickness comparing with real values of depth; this relationship was calibrated with information from 4 depth boreholes done in Caracas, obtaining accurate depth values. The main objective for this new relationship is allow for future studies in other cities of country, had a local relationship between period and sediments thickness that considering local information of soils (Vs30 y Vs) to generate accurate sediment thickness maps from environmental noise measurements.
ARTÍCULOS CIENTÍFICOS Estudios geofísicos en cuencas urbanas en Venezuela con fines de microzonif... more ARTÍCULOS CIENTÍFICOS Estudios geofísicos en cuencas urbanas en Venezuela con fines de microzonificación sísmica.
Since 1998, FUNVISIS has realized geophysical and geotechnical studies in Barquisimeto and Cabuda... more Since 1998, FUNVISIS has realized geophysical and geotechnical studies in Barquisimeto and Cabudare cities in order to determine the physical properties and the sedimentary thickness of the alluvial terrace of Barquisimeto and the Cabudare pull-apart basin. Sediment thickness in Barquisimeto and Cabudare cities was obtained from 3D gravimetric modelling, considering local geology, previous gravimetric models and sedimentary thickness estimated from H/V relation, boreholes and seismic refraction data. We used residual anomaly values as 3D gravity model input data. Data and results, which are fundamental input for calculating soil dynamic responses and the definition of microzones of similar seismic response in both cities, were integrated in a geographic information system (GIS).
Revista De La Facultad De Ingenieria Universidad Central De Venezuela, Jul 25, 2013
Revista de la Facultad de Ingenieria
Since 1998, FUNVISIS has realized geophysical and geotechnical studies in Barquisimeto and Cabuda... more Since 1998, FUNVISIS has realized geophysical and geotechnical studies in Barquisimeto and Cabudare cities in order to determine the physical properties and the sedimentary thickness of the alluvial terrace of Barquisimeto and the Cabudare pull-apart basin. Sediment thickness in Barquisimeto and Cabudare cities was obtained from 3D gravimetric modelling, considering local geology, previous gravimetric models and sedimentary thickness estimated from H/V relation, boreholes and seismic refraction data. We used residual anomaly values as 3D gravity model input data. Data and results, which are fundamental input for calculating soil dynamic responses and the definition of microzones of similar seismic response in both cities, were integrated in a geographic information system (GIS).
Revista de la Facultad de Ingenieria
To contribute to the seismic microzonation of the Mérida metropolitan area, a geophysical charact... more To contribute to the seismic microzonation of the Mérida metropolitan area, a geophysical characterization of the soil, applying methods of ambient seismic noise, gravity and seismic refraction, is performed. From the ambient seismic noise technique, fundamental periods ranging from 0.2 to 2 seconds are obtained, which have good correlation with the sediments thicknesses, obtained from gravimetry, that shows values ranging between 12 and 130 m. The seismic refraction, through 62 seismic profiles, establishes velocity models for the shallow layers up to a maximum depth of 15 m for both P and S waves. All these results provide a basis for a preliminary microzonation map that classifies the metropolitan area into three parts: the zone 1-1 with shear wave velocities from 350 to 650 m/s and sediments thicknesses between 0 and 60 m, the zone 1-2 with shear wave velocities from 350 to 650 m/s and sediments thicknesses greater than 60 m, and the area 2-1 with shear wave velocities equal to ...
Para conocer el valor de las velocidades de las ondas de corte promedio (Vs30), en la zona metrop... more Para conocer el valor de las velocidades de las ondas de corte promedio (Vs30), en la zona metropolitana de Mérida se adquirieron treinta y tres (33) sondeos sísmicos por el método de refracción por microtremores (microsismos) (ReMi). Los valores de velocidad obtenidos se correlacionaron con la geología de la zona y se compararon con resultados previos de otros autores. Los valores de velocidad Vs promedio obtenidos en la zona de estudio están en el rango de 180 a 1520 m/s y aplican las formas espectrales S1 y S2 de las normas COVENIN 1756-1:2001 en la zona sísmica 5. Estos suelos se clasificarían como tipo B, C y D según la especificación de IBC. ABSTRACT Shear wave velocities determination for the topmost 30 m from microearthquakes refraction, ReMi, of the Mérida metropolitan area. To determine shallow shear wave velocities (Vs30) in the Mérida metropolitan area, micro earthquake were recorded usin...
Boletin de Geología, Jun 1, 2015
Para contribuir con la microzonificación sísmica del área metropolitana de Mérida se realiza una ... more Para contribuir con la microzonificación sísmica del área metropolitana de Mérida se realiza una caracterización geofísica del suelo, aplicando métodos de ruido sísmico ambiental, gravimetría y sísmica de refracción, entre otros. A partir de la técnica de ruido sísmico ambiental se obtienen periodos fundamentales que oscilan entre 0,2 y 2 segundos, los cuales presentan una buena correlación con los espesores de los sedimentos, obtenidos a partir de la gravimetría, y cuyos valores varían entre 12 y 130 m. La sísmica de refracción, a través de 62 perfiles sísmicos, establece modelos de velocidades tanto para las ondas P como para las ondas S de las capas más superficiales, hasta una profundidad máxima de 15 m. Todos estos resultados sirven de base para elaborar el mapa preliminar de microzonas sísmicas que clasifica el área metropolitana en tres partes: la zona 1-1 representada por velocidades de ondas de corte (Vs) desde 350 hasta 650 m/s y espesores de sedimentos entre 0 y 60 m; la zona 1-2 con velocidades Vs desde 350 hasta 650 m/s y espesores de sedimentos de más de 60 m y la zona 2-1 con velocidades Vs iguales ó mayores a 650 m/s y con espesores de sedimentos de 0 a 60 m.
Revista de la Facultad de Ingeniería Universidad Central de Venezuela, Jun 1, 2011
Revista de la Facultad de Ingeniería Universidad Central de Venezuela, Jun 1, 2011
Revista de la Facultad de Ingeniería Universidad Central de Venezuela, Jun 1, 2011
ABSTRACT Under the seismic microzoning project of Caracas city, has been done since mid 90s seve... more ABSTRACT Under the seismic microzoning project of Caracas city, has been done since mid 90s several ambient noise measurements in order to determinate fundamentals periods of soil. In this work we showed a new relationship that includes the effect of the surface sediment layers, considering the values of shear-wave velocities for the first 30 m (Vs30) and the value of Vs to the deepest layer. The results indicate that this relationship generates more accurate estimates of sediment thickness comparing with real values of depth; this relationship was calibrated with information from 4 depth boreholes done in Caracas, obtaining accurate depth values. The main objective for this new relationship is allow for future studies in other cities of country, had a local relationship between period and sediments thickness that considering local information of soils (Vs30 y Vs) to generate accurate sediment thickness maps from environmental noise measurements.
ARTÍCULOS CIENTÍFICOS Estudios geofísicos en cuencas urbanas en Venezuela con fines de microzonif... more ARTÍCULOS CIENTÍFICOS Estudios geofísicos en cuencas urbanas en Venezuela con fines de microzonificación sísmica.
Since 1998, FUNVISIS has realized geophysical and geotechnical studies in Barquisimeto and Cabuda... more Since 1998, FUNVISIS has realized geophysical and geotechnical studies in Barquisimeto and Cabudare cities in order to determine the physical properties and the sedimentary thickness of the alluvial terrace of Barquisimeto and the Cabudare pull-apart basin. Sediment thickness in Barquisimeto and Cabudare cities was obtained from 3D gravimetric modelling, considering local geology, previous gravimetric models and sedimentary thickness estimated from H/V relation, boreholes and seismic refraction data. We used residual anomaly values as 3D gravity model input data. Data and results, which are fundamental input for calculating soil dynamic responses and the definition of microzones of similar seismic response in both cities, were integrated in a geographic information system (GIS).
Revista De La Facultad De Ingenieria Universidad Central De Venezuela, Jul 25, 2013
Revista de la Facultad de Ingenieria
Since 1998, FUNVISIS has realized geophysical and geotechnical studies in Barquisimeto and Cabuda... more Since 1998, FUNVISIS has realized geophysical and geotechnical studies in Barquisimeto and Cabudare cities in order to determine the physical properties and the sedimentary thickness of the alluvial terrace of Barquisimeto and the Cabudare pull-apart basin. Sediment thickness in Barquisimeto and Cabudare cities was obtained from 3D gravimetric modelling, considering local geology, previous gravimetric models and sedimentary thickness estimated from H/V relation, boreholes and seismic refraction data. We used residual anomaly values as 3D gravity model input data. Data and results, which are fundamental input for calculating soil dynamic responses and the definition of microzones of similar seismic response in both cities, were integrated in a geographic information system (GIS).
Revista de la Facultad de Ingenieria
To contribute to the seismic microzonation of the Mérida metropolitan area, a geophysical charact... more To contribute to the seismic microzonation of the Mérida metropolitan area, a geophysical characterization of the soil, applying methods of ambient seismic noise, gravity and seismic refraction, is performed. From the ambient seismic noise technique, fundamental periods ranging from 0.2 to 2 seconds are obtained, which have good correlation with the sediments thicknesses, obtained from gravimetry, that shows values ranging between 12 and 130 m. The seismic refraction, through 62 seismic profiles, establishes velocity models for the shallow layers up to a maximum depth of 15 m for both P and S waves. All these results provide a basis for a preliminary microzonation map that classifies the metropolitan area into three parts: the zone 1-1 with shear wave velocities from 350 to 650 m/s and sediments thicknesses between 0 and 60 m, the zone 1-2 with shear wave velocities from 350 to 650 m/s and sediments thicknesses greater than 60 m, and the area 2-1 with shear wave velocities equal to ...