Now showing items 302-321 of 373

    • Slowness surface calculation for different media using the symbolic mathematics language maple® 

      Piedrahita, Carlos; Piedrahita, Carlos; Salinas, Trino; Altamar, Hernando; Pachano, Karen
      Starting from the equation in different media, we obtain the different type of waves that can exists in such media. The evaluation of the eigenvalues and eigenvectors let us construct the slowness surfaces. In general ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Software engineering’s contribution to earthquake engineering 

      Zamora Hernandez, Abigail; González-López, Gloria Inés; González-Navarro, Felix; Ordaz-Schroeder, Mario
      Earthquakes are natural disasters which affect Mexico regularly. It is very important to obtain all information about them quickly, in order to speed up attention to population affected and if it is possible, applying ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Soil sealing in Madrid (Spain), study case of Colmenar Viejo 

      Arístegui Cortijo, Andrés; Pérez González, María Eugenia
      This work analyses soil loss over the last 150 years due to urban growth in one of the boroughs of highest environmental value around Madrid (Spain), i.e. Colmenar Viejo. The extent and patterns followed by urban extension ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Solución a un problema estático en un área con topografía abrupta usando una velocidad de reemplazamiento variable 

      Castillo López, Luis Antonio; Pedraza, Carlos
      Teniendo en cuenta que para poder obtener una buena imagen del subsuelo, es necesario que las soluciones estáticas sean las mas acertadas posibles en la etapa inicial del procesamiento, y no gastar tiempo en ensayos con ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Una solución al problema inverso en geomagnetismo 

      Díaz, Ramiro L.
      Un tema importante en geofísica, es el problema inverso en geomagnetismo. En este trabajo se propone un método para resolverlo, que consiste en hallar la solución de un sistema móvil de ecuaciones no lineales a lo largo ...
      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. 
    • Sondeos electromagnéticos inductivos: teoría, método y aplicación 

      Sanchez S., Sandra Esperanza; Briceño G., Luis Alberto
      Se estudia la teoría electromagnética para encontrar la respuesta de un medio conductor homogéneo con una intrusi6n conductora bidimensional, para el caso de una fuente unidimensional (alambre largo) y una bobina receptora. ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Space-time assessing of the earthquake potential in recent years in the Eastern Anatolia region of Turkey 

      Ozturk, Serkan
      In this study, a statistical analysis is carried out to reveal the current earthquake potential in the Eastern Anatolia region of Turkey. For this purpose, a space-time assessing based on the recent changes in Gutenberg-Richter ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Spatial distribution of sediment pollution in the Khajeh Kory River using Kriging and GIS 

      Zare, Maryam
      The aim of this research was to study of sediment pollution conditions in the river bed of Khajeh Kory, which passes from the southern border of the Caspian Sea in Astara City. To determine the pollution of river bed ...
      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. 
    • Spatio-temporal variability of groundwater depth in the eghlid aquifer in southern iran 

      Delbari, Masoomeh; Bahraini Motlagh, Masoud; Amiri, Meysam
      Groundwater is the main water source for domestic and agricultural use in Eghlid, a city located in Fars province in southern Iran. Here, spatial and temporal changes in groundwater depth were monitored by using geostatistical ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Stacking on common reflection surface with multiparameter traveltime 

      Montes V., Luis A.; Cárdenas Contreras, Andrés
      Commonly seismic images are displayed in time domain because the model in depth can be known only in well logs. To produce seismic sections, pre and post stack processing approaches use time or depth velocity models whereas ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Statistical correlation between b-value and fractal dimension regarding turkish epicentre distribution 

      Öztürk, Serkan
      This study was aimed at analysing the relationship between seismic b-value and fractal dimension Dcvalue for Turkish epicentres. The earthquake catalogue consisting of 99,737 instrumentally-registeredTurkish events was ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Statistical investigation of the groundwater system in darb el-arbaein, southwestern desert, egypt 

      A., Abdel-Lattif.; Kashouty, Mohamed El
      In Darb El Arbaein, the groundwater is the only water resources. The aquifer system starts from Paleozoic-Mesozoic to Upper Cretaceous sandstone rocks. They overlay the basement rocks and the aquifer is confined. In the ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Strain Rate Analysis on the Çankiri-Bingöl Segment of the North Anatolian Fault in Turkey 

      Yavasoglu, Hakan
      The North Anatolian Fault Zone (NAFZ) is one of the most important fault zones of Turkey and the world. It has produced several high magnitude earthquakes that have resulted in massive loss of lives and resources. National ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Study of distribution of remaining oil in West Block of the Third District in North Saertu 

      Wei, Huabin; Zhu, Huanlai; Shi, Shangming; Yang, Xinliang; Zhang, Jingjun; Wang, Jian; Ashraf, Muhammad Aqeel
      Identifying remaining oil distribution is an essential study at the Third District in North Saertu of the West Block in Daqing Oilfield. This field is known as a flooding fine potential tapping demonstration zone, characterized ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Study of the mineralization potential of the intrusives around Valis (Tarom-Iran) 

      Bahajroy, Mojtaba; Taki, Saeed
      The study area is located in northwestern Iran in the central Iran zone, specifically the western Alborz sub-zone south of the Tarom-Hashtjin metallogenic zone. The exposed rock units in this area generally include Eocene ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Study of the relationship between hydro-mechanical soil behavior and microstructure of a structured soil 

      Cordão Neto, Manoel Porfirio; Hernández, Oisy; Lorenzo Reinaldo, Raydel; Borges, Camila; Caicedo, Bernardo
      Structured soils, such as residual laterites or volcanic ashes, abound in tropical regions. The hydro-mechanical behavior of these soils is clearly related to their structure. New techniques based on microstructural studies ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Subsurface cavity detection in a karst environment using electrical resistivity (er): a case study from yongweol-ri, south korea 

      Farooq, Muhammad; et, al
      ABSTRACTKarst voids were encountered during road construction in Yongweol-ri, South Korea. Attempts to determine the extent of the karst voids through drilling was expensive, time-consuming and too dangerous. An electrical ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. 
    • Surfactant modified clays’ consistency limits and contact angles 

      Akbulut, S; Nese, Z; Arasan, S
      This study was aimed at preparing a surfactant modified clay (SMC) and researching the effect of surfactants on clays' contact angles and consistency limits; clay was thus modified by surfactants formodifying their engineering ...
      Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal.