pure and applied geophysics

, Volume 138, Issue 1, pp 61–75 | Cite as

MAGSAT data and Curie-depth below Deccan flood basalts (India)

  • P. K. Agrawal
  • N. K. Thakur
  • J. G. Negi


Ground and airborne magnetic data are severely disturbed due to random susceptibility variations in Deccan flood basalts. However, Magnetic Satellite (MAGSAT) data over the Deccan flood basaltic region of the Indian subcontinent exhibit filtering of surficial noise. Three passes over Deccan traps show a “low” at about 20°N latitude and a “high” at about 23°N latitude. Spectral analysis of these passes and an available 2-D MAGSAT vertical intensity map indicate a deep (40±4 km) magnetic interface. It is interesting to note that the determination of Curie-depth from MAGSAT matches and confirms the geothermal data model. The estimates correspond to the Moho depth derived from gravity and deep seismic sounding studies. The study suggests a continental shield-like geothermal gradient of about 14°C/km below the area.

Key words

MAGSAT Deccan traps spectral analysis Curie-depth 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Arur, M. G., Bains, P. S., andJeevan Lal (1983),Anomaly Map of ‘Z’ Component of Indian Subcontinent from Magnetic Satellite Data, Presented Paper XVIII Gen. Assembly Int. Union of Geod. and Geophys., Hamburg, August 15–27, West Germany.Google Scholar
  2. Auden, J. B. (1975),Seismicity Associated with the Koyna Reservoir, Maharashtra, UNESCO, Paris, Tech. Report. RP/1975-76/2. 222.3.Google Scholar
  3. Balasundaram, M. S., andSrinivasan, P. B. (1971),Koyna Earthquake and its Effect on the Koyna Hydro-electric Project, Proc. Symp. Koyna Earthquake of 11th December 1967 and Related Problems, Calcutta, June 1968, Indian J. Power and Rift Valley Development, Ind. Soc. Eng. Geol.27, 11–14.Google Scholar
  4. Bhattacharya, B. K., andMorley, L. W. (1965),The Delineation of Deep Crustal Magnetic Bodies from Total Field Aeromagnetic Anomalies, J. Geomag. Geoelect.,17, 237–252.Google Scholar
  5. Bulina, L. V. (1961),The Use of Airborne Magnetic Prospecting Data in Deep-seated Structure of the Earth's Crust within the Siberian Platform, Sovetskaya Geol.5, 134–138.Google Scholar
  6. Choubey, V. D. (1971),Pre-Deccan Trap Topography in Central India and Crustal Warping in Relation to Narmada Rift Structure and Volcanic Activity, Bull. Volc.35, 660–685.Google Scholar
  7. Connard, G., Couch, R., andGamperle, M. (1983),Analysis of Aeromagnetic Measurements from the Cascade Range in Central Oregon, Geophys.48, 376–390.Google Scholar
  8. Curtis, C. E., andJain, S. (1975),Determination of Volcanic Thickness and Underlying Structures from Aeromagnetic Maps in the Silet Area of Algeria, Geophys.40, 79–90.Google Scholar
  9. Gasparini, P., Mantovani, M. S. M., Corrado, G., andRapolla, A. (1979),Depth of Curie Temperature in Continental Shields: A Compositional Boundary, Nature278, 845–846.Google Scholar
  10. Hahn, A., Kind, E. G., andMishra, D. C. (1976),Depth Estimation of Magnetic Sources by Means of Fourier Amplitude Spectra, Geophys. Pros.24, 287.Google Scholar
  11. Hall, D. H. (1968),Regional Magnetic Anomalies, Magnetic Units, and Crustal Structure in the Kenora District of Ontario, Can J. Earth Sci.5, 1277–1296.Google Scholar
  12. Hall, D. H. (1975),Long Wavelength Aeromagnetic Anomalies and Deep Crustal Magnetisation in Manitoba and Northwestern Ontario, Canada, J. Geophys Res.40, 403–430.Google Scholar
  13. Kaila, K. L., Murthy, P. R. K., Rao, V. K., andKharetchko, G. E. (1981),Crustal Structure from Deep Seismic Soundings along the Koyna II (Kelsi-Loni) Profile in the Deccan Traps Area, India, Tectonophys.73, 365–384.Google Scholar
  14. Krishnan, M. S.,Geology of India and Burma, 5th Edition (Higginbothams, India 1968).Google Scholar
  15. Krutikhovskaya, A. A., andPashkevich, I. K. (1979),Long Wavelength Magnetic Anomalies as a Source of Information about Deep Crustal Structure, J. Geophys.46, 301–318.Google Scholar
  16. Langel, R. A., Berbert, J., Jennings, T., andHorner, R. (1981),MAGSAT data processing, A Report for Investigators, NASA Technical Memorandum, 82160.Google Scholar
  17. Mayhew, M. A., Johnson, B. D., andLangel, R. A. (1980),An Equivalent Source Model of the Satellite-altitude Magnetic Anomaly Field over Australia, Earth Planet. Sci. Lett.51, 189–198.Google Scholar
  18. Mayhew, M. A. (1982),Application of Satellite Magnetic Anomaly Data to Curie Isotherm Mapping, J. Geophys. Res.87, 4846–4854.Google Scholar
  19. Negi, J. G., Agrawal, P. K., andRao, K. N. N. (1983),Three-dimensional Model of the Koyna Area of Maharashtra State (India) Based on the Spectral Analysis of Aeromagnetic Data, Geophys.48, 964–974.Google Scholar
  20. Negi, J. G., andAgrawal, P. K. (1986),Delineation of Crustal Layers by the Spectral Analysis of Bouguer Gravity Data: A Case History for the Deccan Traps (India), Tectonophys.122, 135–147.Google Scholar
  21. Negi, J. G., Dimri, V. P., Agrawal, P. K., andPandey, O. P. (1986),A Spectral Analysis of the Aeromagnetic Profiles for Thickness Estimation of Flood Basalts of India, Bull. Austr. Soc. Expl. Geophys.17, 105–111.Google Scholar
  22. Negi, J. G., Agrawal, P. K., andPandey, O. P. (1987),Large Variation of Curie Depth and Lithospheric Thickness in Indian Subcontinent and a Case for Magnetothermometry, Geophys. J. R. Astr. Soc.88, 763–775.Google Scholar
  23. Okubo, Y., Graf, R. J., Hansen, R. O., Ogawa, K., andTsu, H. (1985),Curie Point Depths of the Islands of Kyushu and Surrounding Areas, Japan, Geophys.50, 481–491.Google Scholar
  24. Pakiser, L. C., andZietz, I. (1965),Transcontinental Crustal and Upper Mantle Structure, Rev. Geophys.3, 36–79.Google Scholar
  25. Regan, R. D., Cain, J. C., andDavis, W. M. (1975),A Global Magnetic Anomaly Map, J. Geophys. Res.80, 794–802.Google Scholar
  26. Schlinger, C. M. (1985),Magnetisation of Lower Crust and Interpretation of Regional Magnetic Anomalies; Examples from Lofoten and Vesteralen, Norway, J. Geophys. Res.90, 11,484–11,504.Google Scholar
  27. Shuey, R. T., Schellinger, D. K., Tripp, A. C., andAlley, L. D. (1977),Curie Depth Determination from Aeromagnetic Spectra, Geophys. J. R. Astr. Soc.50, 75–101.Google Scholar
  28. Singh, R. N., andNegi, J. G. (1982),High Moho Temperature in the Indian Shield, Tectonophys.82, 299–306.Google Scholar
  29. Spector, A. (1968),Spectral Analysis of Aeromagnetic Maps, Ph.D. Thesis, Department of Physics, Univ. of Toronto, Canada.Google Scholar
  30. Spector, A., andGrant, F. S. (1970),Statistical Models for Interpreting Aeromagnetic Data, Geophys.35, 293–302.Google Scholar
  31. Sukheshwala, R. N. (1981),Deccan Basalt Volcanism, Geol. Soc. Ind. Mem. 3, Deccan Volcanism and Related Basalt Provinces in Other Parts of the World, Bangalore, 8–18.Google Scholar
  32. Tselentis, G. A., Drakopoulos, J., andDimitriadis, K. (1988),A Spectral Approach to Moho Depths Estimation from Gravity Measurements in Epirus (NW Greece), J. Phys. Earth36, 255–266.Google Scholar
  33. Vacquier, V., Steenland, C., Henderson, R. G., andZietz, I. (1963),Interpretation of Aeromagnetic Maps, Geol. Soc. Am. Mem.47, 1–151.Google Scholar
  34. Von Frese, R. R. B., Hinze, W. J., andBraile, L. W. (1982),Regional North American Gravity and Magnetic Anomaly Correlations, Geophys. J. R. Astr. Soc.69, 745–761.Google Scholar
  35. Wasilewski, P. J., andMayhew, M. A. (1982), Crustal Xenolith Magnetic Properties and Long Wavelength Anomaly Source Requirements, Geophys. Res. Lett.9, 329–332.Google Scholar
  36. Wasilewski, P. J., Thomas, H. H., andMayhew, M. A. (1979),The Moho as a Magnetic Boundary, Geophys. Res. Lett.6, 541–544.Google Scholar

Copyright information

© Birkhäuser Verlag 1992

Authors and Affiliations

  • P. K. Agrawal
    • 1
  • N. K. Thakur
    • 1
  • J. G. Negi
    • 1
  1. 1.Theoretical Geophysics GroupNational Geophysical Research InstituteHyderabadIndia

Personalised recommendations