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Browsing Earth Sciences Research Journal by Title
Now showing items 83-102 of 373
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Debris flow susceptibility mapping in a portion of the andes and preandes of san juan, argentina using frequency ratio and logistic regression models
In this study, the frequency ratio and logistic regression models are applied and verified for the analysis of debris flow susceptibility in a portion of the Dry Frontal Andes and Occidental Preandes of San Juan at ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Deep crustal structure and estimation of moho in the lhasa terrane of central tibet
Seismic attributes analysis is applied to INDEPTH II seismic profiles to develop a better understanding of the deep crustal structure and geodynamics of the Lhasa Terrane in the central Tibet area. Analyses indicate that ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Deep physical structure and geotectonic implications of the eastern margin of the Qinghai–Tibet Plateau
The eastern margin of the Qinghai–Tibet Plateau (QTP) is the focus of studies on eastward lateral extrusion of the latter’s crustal material. This study aims to explore the structural response of the QTP’s eastern crust–mantle ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Denoising resistivity phosphate “disturbances” using haar mother wavelet transform (sidi chennane, morocco)
Wavelet transforms originated in geophysics in the early 1980s for the analysis of seismic signals. Since then, significant mathematical advances in wavelet theory have enabled a suite of applications in diverse fields. ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Derivation of Soil Moisture using Modified Dubois Model with field assisted surface roughness on RISAT-1 data
The study discusses the soil moisture estimation using dual polarimetric RISAT-1. The semi-empirical approach of Modified Dubois Model (MDM) derived by (SrinivasaRao 2013) is worked out using (σ ̊HH) and (σ ̊HV) for soil ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Detección en línea de onda-p en sismogramas 3-d utilizando redes neuronales
Se desarrolla un detector en línea del tiempo de arribo de ondas P sobre registros electrónicos de tres componentes de eventos tectónicos. Se lleva a cabo la detección en línea de la onda-p empleando redes neuronales (RN), ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Detecting ionospheric precursors of a deep earthquake (378.8 km) on 7 july 2013, m w=7.2, in papua new guinea under a geomagnetic storm: two-dimensional principal component analysis
Two-dimensional ionospheric total electron content (TEC) data were collected during the time period from 00:00 on 2 July to 12:00 UT on 08 July 2013. This period spanned 5 days before to 1 day after a deep earthquake (378.8 ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Detecting low frequency cycles in rainfall series from colombian coffee-growing area by using descriptive methods
Descriptive statistical methods were used for improving climatic variability scenarios regarding rainfall using time series from five representative pluviometric stations (Miguel Valencia, Naranjal, Cenicafé, La Bella and ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Detecting low frequency cycles in rainfall series from colombian coffee-growing area by using descriptive methods
Descriptive statistical methods were used for improving climatic variability scenarios regarding rainfall using time series from five representative pluviometric stations (Miguel Valencia, Naranjal, Cenicafé, La Bella and ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Determinación de mecanismos focales para temblores pequeños ó moderados: región del caribe nororiental
La determinación del mecanismo focal de un terremoto contribuyó considerablemente al entendimiento del comportamiento tectónico de la zona de generación. Actualmente tenemos las soluciones globales CMT (Centroid Moment ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Determinación de nuevas estaciones absolutas de gravedad en colombia
Durante el mes de mayo de 1995 se establecieron en Colombia tres nuevas estaciones con valor absoluto de la gravedad utilizando el gravímetro AXIS FG-5. Estas mediciones fueron realizadas por Defense Mapping Agency (D. ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Determination of effective elastic thickness of the colombian andes using satellite-derived gravity data
Gravity anomaly values derived from Global Geopotential Models (calculated from the CHAMP and GRACE satellite missions), are compared with free air ground gravity data to find the best representation of surface data. Using ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Determination of Local Site-Specific Spectra Using Probabilistic Seismic Hazard Analysis for Bitlis Province, Turkey
In this study, site-specific earthquake spectra for Bitlis province in Lake Van Basin has been obtained. It is noteworthy that, in probabilistic seismic hazard assessment, as a first stage data from geological studies and ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Determining Optimal Polypropylene Fiber Dosages In Sprayed Concrete For Mining And Civil Engineering Applications
In this study, experimental investigations were carried out on polypropylene fiber (PF), steel mesh (SM) and PF+SMreinforced shotcrete (RS) panels to evaluate performance characteristics of energy absorption and load ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Determining the parameters of earthquake sources in south america from macroseismic intensity data (ceresis database)
In the past decades many different procedures have been made to handle the historical data for the determination of the earthquake source parameters. This has been only possible dealing with historical data interpreted and ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Development of Tropical Lowland Peat Forest Phasic Community Zonations in the Kota Samarahan-Asajaya area, West Sarawak, Malaysia
Logging observations of auger profiles (Tarmizi, 2014) indicate a vertical, downwards, general decrease of peat humification levels with depth in a tropical lowland peat forest in the Kota Samarahan-Asajaya area in the ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Diagenetic controls on reservoir quality of tight sandstone: A case study of the Upper Triassic Yanchang formation Chang 7 sandstones, Ordos Basin, China
Through a range of petrological techniques, the petrology, diagenesis, pore characteristics, and controlling factors on the regional variations of reservoir quality of the Chang 7 sandstones were studied. These sandstones, ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Diffraction Characteristics of Small Fault ahead of tunnel face in coal roadway
Small fault ahead of the tunnel face in coal roadway is the important hidden hazard factor of coal and gas outburst accidents. The study of small fault prediction has important practical significance, which is the urgent ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Direct Shear Test of Unsaturated Soil
The present study focuses on some tentative laboratory tests using a newly-constructed modified direct shear test apparatus. The single-stage and multistage direct shear tests were performed to determine the shear rate and ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Discussion of “clustering on dissimilarity representations for detecting mislabelled seismic signals at nevado del ruiz volcano” by mauricio orozco-alzate, and césar germán castellanos-domínguez
The authors are to be congratulated for a systematic investigationof the accurate and non subjective classifying approach in seismic research. The authors have conducted several clustering algorithms to the seismic event ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal.
