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| Paper Type | : | Research Paper |
| Title | : | Demarcation of Faults and Fracture Zones from Very Low Frequency-EM Studies |
| Country | : | India |
| Authors | : | M. Preeti || G. Ramadass |
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: | 10.9790/0990-0605010104  |
Abstract: The Very Low Frequency-EM method is helpful to identify the different geological formations, faults and fractures depending upon their variable conductive properties. The study area Putluru and Yellanur mandals in Ananthapur district, AP mainly covered with Tadipatri shales and few sills and dyke intrusions are present in these shales. Real and Imaginary component plots and Real component pseudo sections up to depth of 60m clearly demarcated the tectonically disturbed zones from the undisturbed areas. Several faults and fractures are identified from these VLF studies which are highly conductive. The evidence of sill intrusions are inferred from high resistive zones in the medium resistive zones of Tadipatri shales.
Keywords- Tadipatri shales, Conductive zones, Sill intrusions, faults and fractures.
[1]. King, W. (1872). The Cuddapah and Kurnool formations in Madras Presidency: Mem. Geol. Surv. Ind., V.8, Part 1, pp.1-346.
[2]. Nagaraja Rao, B.K, Rajurkar, S.T., Ramalingaswamy, G., and Ravindara Babu, B. (1987). Stratigraphy, structure and evolution of the Cuddapah basin: In B.P. Radhakrishna, (Ed.) Purana basins of Peninsular India, Memoir 6, Geol. Soc. India, Bangalore, pp.33-86.
[3]. Sreedhar Murthy, Y (2007). Report "A Geophysical Investigation on gushing of Gas in parts of Cuddapah Basin: An Aid To Future Hydrocarbon Exploration Programmes".
[4]. Sreedhar Murthy, Y., Sarma SVS., Murali S. and Preeti M. (2012). Geophysical Study of the Gas Show Area in the South Western Region of the Proterozoic Cuddapah Basin, Jour. Of Geophysics, Vol XXXIII No.3, pp:41-48.
[5]. Rajagopal.V.D. (2007). Report on Drinking water Borewell from which Gas is gushing out in S. Venganapalli Village, Putlur Mandal, Anantapur District. Director of Mines and Geology, Hyderabad.
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| Paper Type | : | Research Paper |
| Title | : | Mapping of depth to bedrock in the Middle Lower Benue Trough Nigeria, using Seismic Refraction Method |
| Country | : | Nigeria |
| Authors | : | Precious C. Mgbemere || Etim D. Uko || Clifford N. C. Mbachi || Iyeneomie Tamunobereton-Ari || Charles O. Ofoegbu || Aminayanasa P. Ngeri |
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: | 10.9790/0990-0605010514 |
Abstract: Seismic characteristics in the Middle Benue Trough were investigated at 39 acquisition stations Seismic refraction method. Two overlapping reversed profiles were shot into 12 stations of geophones at each station. Each shot hole was 1.5m deep primed with 0.20kg dynamite as source. The acquisition equipment was McSeis-160MXTM. Analysis of the results revealed 2-layers cases. The velocity of the Low-Velocity Layer, Vo, varies between 399 and 944ms-1 with average of 659.13 ms-1. The underlying Consolidated Layer has velocity, V1, which varies between 1210 and 4240ms-1 with an average of 2214.00ms-1. Velocity appears greater when shooting up-dip, while velocity is reduced when shooting down-dip which could be attributed to either dipping layers or/and subsurface sediment heterogeneity. Depth of refractor, Z, varies between 2.80 and 6.5m with average of 4.38m. Elevation varies between 63 and 228m with average of 148.51m. Weathered thickness and elevation were highly variable resulting from both surface- and surface-topographic.........
Keywords- Seismic refraction, velocity, weathered and consolidated layers, bedrock, Middle Benue Trough, Nigeria.
[1]. Uko, E. D., Ekine, A. S., Ebeniro, J. O. and Ofoegbu, C. O. (1992). Weathering Structure of the East Central Niger Delta, Nigeria. Geophysics, 57 (9), 1228-1233.
[2]. Eze, C. L., Okwueze, E. E. and Uko, E. D. (2003). The velocity-thickness characteristics of the mangrove swamp low velocity layer (LVL) South central Niger Delta, Nigeria. Global Journal of Pure and Applied Sciences, 9 (3), 369-374.
[3]. Watkins, J. S., L. A. Waltersa, and R. H. Godson (1972). Dependence of in-situ compressional wave velocity on porosity in unsaturated rocks. Geophysics, 37, 29 – 35.
[4]. Telford, W. M., Geldart, L. P., Sheriff, P. E. and Keys, D. A. (1976). Applied Geophysics. Cambridge University Press, London, Pp. 271 – 274; 281 – 284.
[5]. Marsden, D. (1993). Static correction. A review, The Leading Edge, 12 (2), 115 – 120.
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| Paper Type | : | Research Paper |
| Title | : | Change Detection applied to the identification of anthropic areas in the city of Rio de Janeiro - Brazil, between 2000 and 2015 - Case Study for Planning Area 4 |
| Country | : | |
| Authors | : | Vandré Soares Viegas || Ana Paula de Oliveira || Elizabeth Maria Feitosa da Rocha de Souza |
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: | 10.9790/0990-0605011521 |
Abstract: With the advent of remote sensing techniques, there are a large number of tools that can contribute directly to the analysis of the modified urban environment, since the expansion of a certain occupied area as well as its occupation can be easily detected through images of satellite. The objective of this research is to evaluate the changes occurred in Planning Area 4 - in Rio de Janeiro, using TM / LANDSAT Image Detection techniques to detect soil cover changes occurring in the period from 2000 to 2015. The images were submitted to specific curves with the spectral response of the targets to verify the adjustment of the images. Finally, the GEOBIA model was generated for the identification of urban areas, using the descriptors NDBI, NDWI and NDVI. After the modeling of the descriptors and the mapping of urban areas in the PA 4 it was possible to identify changes and social characteristics of the results.
[1]. Warehouse of Data – Instituto Pereira Passos (IPP) - Available at: http://www.armazemdedados.rio.rj.gov.br/ access in November 2016
[2]. Florenzano, Teresa Gallotti Initiation in Remote Sensing. 3rd Ed. Andcurrent. São Paulo: Oficina de Textos (2011)
[3]. Brazilian Institute Of Geography and Statistics - IBGE (CENSUS DATA 2010). Available at http://downloads.ibge.gov.br/downloads_estatisticas.htm. Accessed in December 2016CD, et al. Lipoprotein
[4]. Oliveira, A.P.; VIEGAS, V.S.; ALMEIDA, P.M.; SOUZA, E.M.F.R; GEOBIA Change Detection and modeling for identification of anthropico areas in the city of Rio de Janeiro between 2000 and 2015. Proceedings of the XVII Braziliam Symposium on Remote Sensing. SBSR ISBN: 978 -85-17-00088-1
[5]. Ponzoni, F. J.; Shimabukuro, Y. E. Remote Sensing in the study of vegetation. p.144. São José dos Campos - SP: EditoraParêntese, 2009..