Now showing items 1-20 of 373

    • Vichada meteorite impact effects from simulation of regional environmental consequences of a meteoroid impact on Earth 

      Hernandez Pardo, Orlando
      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. 
    • Metallogenic Dynamics Background of Ga’erqiong Cu-Au Deposit in Tibet, China 

      Ouyang, Yuan; Yang, Wunian; Huang, Hanxiao; Liu, Hong; Zhang, Jianlong; Zhang, Jianhua
      The Ga’erqiong Cu-Au deposit, which sits on the north side of the Coqên-Xainzamagmatite belt, is a large-scale skarn-type deposit, whose ore body has formed in the skarn zone in the contact part of quartz diorite and marble ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Diffraction Characteristics of Small Fault ahead of tunnel face in coal roadway 

      Wang, Bo; Liu, Shengdong; Zhou, Fubao; Zhang, Jun; Zheng, Fangkun
      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. 
    • Quantitative Calculation of Aquifer Water Quantity Using TEM Data 

      Huang, Lanying; Liu, Shengdong; Wang, Bo; Zhou, Fubao
      Mine water is a menace to coal mining. Mine water quantity is generally detected by drilling in the coal mine roadway, and the disadvantage is high workload and low efficiency. Therefore, transient electromagnetic method ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Contrasting styles of lead-zinc-barium mineralization in the Lower Benue Trough, Southeastern Nigeria 

      Oha, Ifeanyi Andrew; Onuoha, Kalu Mosto; Dada, Silas Sunday
      In the Lower Benue Trough of Southeastern Nigeria, lead-zinc-barium mineralization occurs as widely distributed epigenetic fracture-controlled vein deposits which are restricted to Albian – Turonian sediments. Detailed ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Spatial Quality Control Method for Surface Temperature Observations Based on Multiple Elements 

      Ye, Xiaoling; Yang, Xing; Xiong, Xiong; Yang, Shuai; Chen, Yang
      Quality control can effectively improve the quality of surface meteorological observations. To ensure the stability and effectiveness of a quality control model under different terrain and climate conditions, it is necessary ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Long-term prediction of wind speed in La Serena City (Chile) using hybrid neural network-particle swarm algorithm 

      Lazzús, Juan A; Salfate, Ignacio
      An artificial neural network was used for forecasting of long-term wind speed data (24 and 48 hours ahead) in La Serena City (Chile). In order to obtain a more effective correlation and prediction, a particle swarm algorithm ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Solution and type curves for the seepage model of the water-bearing coalbed with leakage recharge 

      Chen, Wangang; Yang, Yu; Sun, Hansen; Zhang, Chengwei; Wen, Qin; Li, Yanyan
      To analyze the effects of the leakage recharge of the aquifer on the initial dewatering of coalbed methane wells, the mathematical seepage model of water in the coalbed considering the aquifer leakage was established by ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Empirical Correlations for the Swelling Pressure of Expansive Clays in the City of Barranquilla, Colombia 

      Cantillo, Victor; Mercado, Vicente; Pájaro, César
      Swelling behavior of clays is of great importance for numerous engineering applications due to the prevalence of expansive clays around the world. Expansive clays are present in Mexico City, United States, Australia, Africa ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Letter from the editor 

      Vargas Jiménez, Carlos Alberto
      It's time to present our second volume of 2017. The result of a great effort to put into your hands some works of the best quality. With this selection of articles, an invitation to the Colombian Geology Congress.As every ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Letter from the editor 

      Vargas Jiménez, Carlos A.
      Earth Sciences Research Journal presents its latest issue, Volume 19, number 2, with a positive balance in the eve of 2016 and with the challenges for the future editions. During the last two decades, we have published ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Application of Artificial Neural Network for Predicting Shaft and Tip Resistances of Concrete Piles 

      Momeni, Ehsan; Nazir, Ramli; Jahed Armaghani, Danial; Maizir, Harnedi
      Axial bearing capacity (ABC) of piles is usually determined by static load test (SLT). However, conducting SLT is costly and time-consuming. High strain dynamic pile testing (HSDPT) which is provided by pile driving analyzer ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Magmatic Evolution and Compositional Characteristics of Tertiary Volcanic Rocks Associated with the Venarch Manganese Mineralization, Sw Qom, Central Iran 

      Mahdavi, Mansoureh; Dabiri, Rahim; Shah Hosseini, Elham
      The manganese (Mn) deposits of Iran date from late Proterozoic to Pliocene but the major high-grade Mn ore deposits are associated with tertiary basic to intermediate volcanic rocks. The Venarch Mn deposit is located in ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Performance of Single Base RTK GNSS Method versus Network RTK 

      Aykut, Nedim Onur; Gülal, Engin; Akpinar, Burak
      After the late 1990s, GNSS/GPS network RTK technology has become the preferred technique in the world, today widely used in various applications such as monitoring, early warning systems, and mapping and engineering ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • The Tatuí Formation (Early Permian, Paraná Basin), Brazil: Paleontology and Paleoenvironmental Considerations 

      Chahud, Artur; Petri, Setembrino
      The Tatuí Formation, one of the Brazilian Paraná Basin geological units, is developed solely in the State of São Paulo, southeast Brazil. It is studied herein, through outcrops at the eastern border of the basin, which are ...
      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 

      Işık, Ercan; Kutanis, Mustafa
      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. 
    • Assessment of a Modified Rock Mass Classification System for Rock Slope Stability Analysis in the Q-system 

      Fereidooni, Davood; Khanlari, Gholam Reza; Heidari, Mojtaba
      This paper explores the applicability of a modified Q classification system and its component parameters for analysis and conclusion of site investigation data to estimate rock slope stability. Based on the literature, Q ...
      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 

      Kahraman, Bayram
      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. 
    • Seismotectonic-Geologic Hazards Zoning of Iran 

      Arian, Mehran
      Seismotectonic-geologic hazards zoning map of Iran is drawn based on deterministic seismic hazards evaluation using the seismicity records, structural trends, tectonic settings, fault ruptures and neotectonics activities ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Assessing the weathering of granitic stones on historical urban buildings by geochemical indices 

      Sanjurjo-Sánchez, Jorge; Alves, Carlos; Vidal Romani, Juan Ramón
      Weathering involves important processes that alter the original structure, texture and chemical components of rocks and minerals. Bulk changes produced by weathering in granitic rocks have been studied by several methods, ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal.