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Now showing items 356-373 of 373
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Uncertainty in rainfall input data in a conceptual water balance model: effects on outputs and implications for predictability
As hydrological models become more prevalent in water resources planning and management, increasing levels of detail and precision are needed. Currently, reliable models that simulate the hydrological behavior of a basin ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Unexpected response of mt. wrangell volcano, alaska, to the shaking from a large regional earthquake: a puzzle for intermediate-term earthquake-volcanoes interactions
On November 3, 2002 three segments of the Denali fault in interior Alaska ruptured during a Mw 7.9 earthquake, offering a unique opportunity to study earthquake-volcano interactions. Out of the 24 volcanoes that are ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Using aromatic biological markers as a tool for assessing thermal maturity of source rocks in the campano-maastrichtian mamu formation, southeastern nigeria
The concentration and distribution of aromatic biomarkers in coals and shales from five boreholes penetrating the Maastrichtian Mamu Formation of the Anambra Basin, southeastern Nigeria, were investigated by gas ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Using conodont elements to distinguish permian-triassic boundary disconformity near haftad gholleh, central iran
The present study focuses on stratigraphy of the Permo-Triassic boundary in the Haftad Gholleh in the east Arak and north of the Mahallat, which is located in central Iran. This boundary is an erosional unconformity or ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Using GIS And Geophysics In Selecting Suitable Basins With Freshwater Aquifers For An Efficient Exploration Strategy - A Case Study From Petra-Region, Jordan
In this study, an effective and time-saving strategy for groundwater exploration in alluvium basins in arid-semiarid lands was applied by integrating GIS and geophysics. Three steps were followed to locate productive local ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Using the fractal dimension of earthquake distributions and the slope of the recurrence curve to forecast earthquakes in colombia
An estimation and analysis of temporal and spatial variations (on the surface, and depending on depth) of the parameters of the seismic regime (fractal dimension of the earthquakes distribution d and slope of the ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Using the karhunen-loève transform to suppress ground roll in seismic data
ABSTRACTThe Sacchi's algorithm (2002) based on the Karhunen-Loève (K-L) Transform was modified and implemented to suppress Ground Roll without distortion of the reflection signals, it provided better results than conventional ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Using the micro – resistivity method to detect hispanic ancient floors at nombre de dios, panamá
This article describes the application of the method of electric prospection to the detection of floors of hispanic type associated with the site of Nombre de Dios. This site represents an important and ancient Spanish ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Utilización de redes neuronales para la determinación de respuestas de sitio a partir de ondas coda aplicación para armenia colombia
Se han utilizado datos acelerográficos triaxiales relacionados con replicas del terremoto de Armenia, Colombia (25-01-99, Mw = 6.2), para determinar la función de transferencia Formaciones blandas/Roca dura en dos sitios ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Variable-Permeability Well-Testing Models and Pressure Response in Low-Permeability Reservoirs with non-Darcy Flow
This paper proposes the concept of variable-permeability effect and sets up the one-dimensional and two-dimensional non-Darcy well testing models. The finite difference algorithm is employed to solve the differential ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Variación horaria de la humedad relativa del aire en el observatorio meteorológico nacional santafé de bogotá - colombia
Se determinan los valores medios horarios y la variación de la humedad relativa del aire para cada mes y el ano, con base en las observaciones horarias realizadas en la estación Observatorio Meteorológico Nacional-Ciudad ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Vertebrates of the marília formation (late maastrichtian) from the peirópolis paleontological site: toward a better understanding
The Peirópolis paleontological site (Late Cretaceous, Maastrichtian) in Minas Gerais State, Brazil yielded an important assemblage of fossil vertebrates. The typical occurrence of South American widespread taxa in Peirópolis ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Vichada meteorite impact effects from simulation of regional environmental consequences of a meteoroid impact on Earth
This study estimates the regional environmental consequences of the impactor extraterrestrial body that could produce the probable Vichada impact crater structure on the Vichada Plain, in Colombia, South America. This paper ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Water temperature prediction in a subtropical subalpine lake using soft computing techniques
Lake water temperature is one of the key parameters in determining the ecological conditions within a lake, as it influences both chemical and biological processes. Therefore, accurate prediction of water temperature is ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Wave equation datuming to correct topography effect on foothill seismic data
The current seismic processing applies Static Corrections to overcome the effects associated to rough topography, based in the assumption that velocity in near surface is lower than in the substratum, which force going up ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
X-ray color maps of the zoned garnets from silgará formation metamorphic rocks,santandermassif, eastern cordillera (colombia)
The metamorphic rocks of the Lower Paleozoic Silgará Formation of the Santander Massif, Eastern Cordillera (Colombia), were affected by a Barrovian-type metamorphism under low to high temperature and medium pressure ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Zeolitisation of neogene sedimentary and pyroclastic rocks exposed in paipa (boyacá), in the colombian andes: simulating their natural formation conditions
The present study concerns the synthesis of zeolites from Neogene sedimentary and pyroclastic rocks exposed around the Sochagota Lake, Paipa (Boyacá). Two synthesis methods were used: conventional hydrothermal treatment ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Zeolitisation of neogene sedimentary and pyroclastic rocks exposed in paipa (boyacá), in the colombian andes: simulating their natural formation conditions
The present study concerns the synthesis of zeolites from Neogene sedimentary and pyroclastic rocks exposed around the Sochagota Lake, Paipa (Boyacá). Two synthesis methods were used: conventional hydrothermal treatment ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal.
