Abstract
A campaign of audio-magnetotelluric soundings in the crater of Momotombo has shown that the structure of this volcano is suitable to a surveillance by this method; it has an only central activity, and the resistivity versus the depth decreases suddenly at least 100 times at about 270 m.
So, this technical paper describes the equipment designed and built in order to measure every 2 hr the apparent resistivity in a given direction, at seven frequencies regularly spaced from 5 to 312 Hz.
The data are preprocessed to fill only 32 bytes: they are
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- on the one hand, printed locally for the close surveillance;
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- on the other hand, transmitted by an ARGOS platform and received in Garchy via satellite for searching studies
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References
Ander, M. E., Goss, R., Strangway, D., Hillebrand, C., Laughlin, A. W., and Hudson, C.: 1980, ‘Magnetotelluric/Audiomagnetotelluric Study of the Zuni Hot Dry Rock Geothermal Prospect, New Mexcico’,Geothermal Resources Council, Trans. 4.
Ander, M. F.: 1981, ‘Magnetotelluric Exploration in Arizona and New Mexico for Hot Dry Rock Geothermal Energy Using SQUID Magnetometers’, in H. Weinstock and W. C. Overton, Jr. (eds.),SQUID Applications to Geophysics, Soc. Explor. Geophys., pp. 61–65, Tulsa, Oklahoma.
Ander, M. E.: 1982, ‘Magnetotellurics Applied to Hot Dry Rock Geothermal Exploration in Arizona and New Mexico’,Hot Dry Rock Geothermal Exploration Workshop, Los Alamos National Laboratory.
Aubert, M., Dupis, A., Lenat, J. F., Roux, J., et Senaud, G.: 1979, Exploration géophysique de la fosse volcano-tectonique du Cantal’,Compt. Rend. Acad. Sci. Paris., 1. 288, Série D, 215–218.
Aubert, M., Dupis, A., Lenat, J. F., Roux, J., et Senaud, G.: 1982, ‘Structure of the Cantal Strato-Volcano, French Central Massif, from Electric, Magnetotelluric Soundings and Aeromagnetic Data’,Journ. of Volcanology and geothermal Research 12, 77–99.
Ballestracci, R. et Benderitter, Y.: 1980, ‘Sondages magnéto-telluriques dans le rift d'Asal (République de Djibouti)’,Bull. Soc. géol. France. (7), t.XXII, no6, pp. 873–879.
Beblo, M. and Bjornsson, A.: 1978, ‘Magnetotelluric Investigation of the Lower Crust and Upper Mantle Beneath Iceland’,J. Geophys. 45, 1–16.
Beblo, M., Bjornsson, A., Arnason, K., Stein, B., and Wolfgram, P.: 1983, ‘Electrical Conductivity Beneath Iceland-Constraints Imposed by Magnetotelluric Results on Temperature, Partial Melt, Crust and Mantle Structure’,J. Geophys. 53, 16–23.
Beblo, M. and Bjornsson, A.: 1980, ‘A Model of Electrical Resistivity Beneath NE-Iceland: Correlation with Temperature’,J. Geophys. 47, 184–190.
Benderitter, Y., and Gerard, A.: 1984, ‘Audio-Magnetotelluric Study of La Réunion Island in Order to Estimate its Geothermal Potentiality’,Journal of Volcanology and Geothermal Research. 20, 311–332.
Benderitter, Y., Ballestracci, R., and Nougier, J.: 1983, ‘Mise en évidence par sondages audiomagnétotelluriques d'une zone électriquement conductrice sous les plateaux basaltiques de iles Kerguelen’,Compt. Rend. Acad. Sci. Paris, Série II. t. 296, 833–838.
Benderitter, Y.: ‘Investigation audiomagnétotellurique et recherche d'une cible géothermique dans la région de Morne Rouge (Martinique)’,Rapport B.R.G.M. 83, SGN 725 IRG.
Bostick, F. X. Jr.: 1977, ‘A Simple almost Exact Method of MT Analysis’, inWorkshop on Electrical Methods in Geothermal Exploration, Report of the Geothermal Workshop, University of Utah, Salt Lake City.
Bostick, F. X. Jr., Smith, H. W., and Boehl, J.: 1977, ‘Audio-magnetotelluric Investigation on Kilauea Volcano and Kileuca Lava Lake, Final Report to Sandia laboratories: Electromagnetic Research Group. Department of Electrical Engineering, University of Texas, Austin.
Dupis, A.: 1971, ‘Premières applications de la magnéto-tellurique à la prospection pétroliére, géologique ou minière de diverses régions métropolitaines’,Ann. di Geofis,XXIV, no 2, 145–286.
Gamble, T. D., Goubau, W. M., Goldstein, N. E., and Clarke, J.: 1980. Referenced Magnetotellurics at Cerro Prieto’,Geothermics 9, 49–63.
Gamble, T. D., Goubau, W. M., Goldstein, N. E., Miracky, R., Stark, M., and Clarke, J.: 1981, ‘Magnetotelluric Studies at Cerro Prieto’,Geothermics 10, 169–182.
Goldstein, N. E. and Mozley, E.: 1978, ‘A Telluric-Magnetotelluric Survey at Mount Hood, Oregon-A Preliminary Study’, Report No LBL-7050, Berkeley, Lawrence Berkeley Laboratory.
Goldstein, N. E., Mozley, E., and Wilt, M.: 1982, ‘Interpretation of Shallow Electrical Features from Electromagnetic and Magnetotelluric Surveys at Mount Hood, Oregon’.Journ. Geophys. Res. 87, 2815–2828.
Grillot, L. R.: 1973, ‘Regional Electrical Structure Beneath Iceland as Determined from Magnetotelluric Data’, Ph.D. Thesis, Dept. of Geological Sciences, Brown University, 80, pp.
Hermance, J. F., Thayer, R. E., and Bjornsson, A.: 1976, ‘The Telluric-Magnetotelluric Method in the Regional Assessment of Geothermal Potential’, inProc. Second U. N. Symposium on the Development and Use Geothermal Resources 2, 1037–1048, Stock No. UG0-000-0000S-1 Supt. Documents, U.S. Government Printing Office, Washington, DC, 20402.
Hermance, J. F. and Pedersen, J.: 1980, ‘The Deep Structure of the Rio Grande Rift: A Magnetotelluric Study’,J. Geophys. Res. 85, 3899–3912.
Hermance, J. F.: 1981 ’Crustal Genesis in Iceland: Geophysical Constraints on Crustal Thickening with Age’,Geophys. Res. Letters 8, 203–206.
Hermance, J. F.: 1982, ‘Magnetotelluric and Geomagnetic Deep-Sounding Studies in Rifts and Adjacent Areas: Constraints on Physical Processes in the Crust and Upper Mantle’,Special Volume on Continental and Ocean Rifts 8, 169–192, International Commission on Geodynamics, AGU.
Hermance, J. F., and Colp, J. L.: 1982, ‘Kilauea Iki Lava Lake: Geophysical Constraints on its Present (1980) Physical State’,Journ. of Volcanology and Geothermal Res. 13, 31–61.
Hoover, D. B., Frischknecht, F. C., and Tippens, C. L.: 1976, ‘Audiomagnetotelluric Sounding as a Reconnaissance Exploration Technique in Long Valley, CA’.J. Geophys. Res. 81, 801–809.
Hoover, D. B., Brougham, G., and Clark, J.: 1976, ‘Audiomagnetotelluric Data Log, Station Location Map, and Telluric profile Data for the Elko Hot Springs Known Geothermal Resource Area (KGRA)’, Nevada: U.S.G.S.: Open-File Report 76-152.
Hoover, D. B., Long, C. L., and Senterfit, R.: 1978, ‘Audiomagnetotelluric Investigations in Geothermal Areas’,Geophys. 43, 1501–1514.
Pedersen, J. and Hermance, J. F.: 1976, ‘Towards Resolving the Absence or Presence of an Active Magma Chamber Under the Southern Rio Grande Rift Zone (abstract),EOS,57, 1014.
Pedersen, J. and Hermance, J. F.: 1978, ‘Evidence for Molten material at Shallow to Intermediate Crustal Levels Beneath the Rio Grande Rift at Santa Fe (abstract),EOS,59, 390.
Pedersen, J.: 1980, ‘A Magnetotelluric Investigation of the Deep Electrical Structure of the Rio Grande Rift and Adjacent Tectonic Provinces’, Ph.D. thesis, Dept. Geol. Sci., Brown Univ., 29pp.
Pedersen, J. and Hermance, J. F.: 1981, ‘The Deep Electrical Structure of the Colorado Plateau from Magnetotelluric Measurements’,J. Geophys. Res. 86, 1849–1857.
Pham Van Ngoc: 1976, ‘Magnetotelluric Reconnaissance Survey in the Lilloet Valley’, British Columbia, Open File Report, Earth Physics Branch, Energy Mines and Resources Canada, Ottawa, Canada.
Pham Van Ngoc: 1978, ‘Magnetotelluric Prospecting in the Mount Meager Geothermal Region (British Columbia)’, Open File Report, Earth Physics Branch, Energy Mines and Resources Canada, Ottawa, Canada
Pham Van Ngoc: 1980, ‘Magenetotelluric Survey of the Mount Meager Region and the Squamish Valley (British Columbia). Open File Report, Earth Physics Branch, Energy Mines and Resources Canada, Ottawa, Canada.
Slocum, W. M., Alvarez, L. J., and Hermance, J. F.: 1980, ‘Combined Variation Grandiometry Measurements and magnetotelluric Measurements in Iceland’,EOS,61, 225–226.
Stanley, W. D., Wahl, R. R., and Rosenbaum, J. G.: 1976, ‘A Magnetotelluric Study of the Stillwater-Soda Lakes, Nevada Geothermal Area’, USGS Open File Report No. 76-80.
Stanley, W. D., Boehl, J. E., Bostick, F. X., and Smith, H. W.: 1977, ‘Geothermal Significance of Magnetotelluric Sounding in the Eastern Snake River Plain-Yellowstone Region’,J. Geophys. Res. 82, 2501–2514.
Stanley, W. D.: 1981, ‘Magnetotelluric Survey of the Cascade Volcanoes Region’, Pacific Northwest: Presented at 51st annual SEG meeting, Los Angeles.
Stanley, W. D.: 1982, ‘A Regional Magnetotelluric Survey of the Cascade Mountains Region’, U.S. Geological Survey Open File Report, 25 pp.
Stanley, W. D.: 1982, ‘A Regional Magnetotelluric Survey of the Cascade Range Region’, northwestern United States: U.S. Geological Survey Open File Report No. 82 126.
Thayer, R. E.: 1975, ‘Telluric-Magnetotelluric Investigations of Regional Geothermal Processes in Iceland’, Dissertation for the Degree of Doctor of Philosophy in the Dept. of Geol. Sciences at Brown University, 276 pp.
Thayer, R. E., Bjornsson, A., Alvarez, L., and Hermanance, J. F.: 1981, ‘Magma Genesis and Crustal Spreading in the Northern Neovolcanic Zone of Iceland: Telluric-Magnetotelluric Constraints’,Geophys. J.,65, 423–442.
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Clerc, G., Décriaud, JP., Doyen, G. et al. An automatic audio-magnetotelluric equipment, controlled by microprocessor, for the telesurvellance of the volcano Momotombo (Nicaragua). Geophysical Surveys 6, 291–304 (1984). https://doi.org/10.1007/BF01465544
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DOI: https://doi.org/10.1007/BF01465544