Prof. Dhananjay Ravat

(Reading, Writing, Speaking)

Hawaii Spacegrant, LPI, NASA: Exploring Planets in the Classroom Workshop (to attend), $1,000, June 1998 to .
U.S. Geological Survey: Magnetic Anomalies of the continental U.S. from NURE data using the Comprehensive Model, $50,000, 2006 to 2008.
US-Egypt Joint Science & Technology Board/State Dept/NSF: Spectral analysis of aeromagnetic data for geothermal reconnaissance of the west of the Red Sea region in Egypt, $60,000, 2006 to 2010.
National Aeronautics and Space Administration (NASA): Geodynamics of the lithosphere using potential-field variations, $152,000, 2003 to 2007.
U.S. Geological Survey: A Collaborative Project between Potential-fields Geophysical Laboratory at Southern Illinois University Carbondale and the U.S. Geological Survey for Generating a Complex Model to Create Long wavelength Correction, $41,000, 2002 to 2003.
National Aeronautics and Space Administration (NASA): Interpretation of the Mars Crustal Magnetic Anomalies, $64,000, 2000 to 2004.
National Aeronautics and Space Administration (NASA): Comprehensive Models of the Near-Earth Magnetic Field, $111,000, 1998 to 2002.
National Aeronautics and Space Administration (NASA): Geologic Interpretation of Satellite Altitude Crustal Magnetic Anomaly Data, $133,000, 1998 to 2003.
National Aeronautics and Space Administration (NASA): IPA Appointment for Research in Geomagnetism, $140,000, 1997 to 1998.
National Aeronautics and Space Administration (NASA): Geophysical Characterization of Some Terranes and the Geophysical Modeling of Candidate Suture Zones, $70,000, 1995 to 1999.
UPIIP, SIUC: Investigation of a New Geo-Physical Technique for Detection and Monitoring of Subsurface Contaminant Leakage, $13,000, 1995 to 1996.
National Science Foundation (NSF) & SIUC: Development of environmental geoscience computer laboratory, $61,000, 1995 to 1996.
Office of Research, Development & Administration, SIUC: New geophysical strategies for indirect monitoring of deterioration of buried steel drums containing hazardous wastes: The pilot study, $21,000, 1993 to 1995.
National Aeronautics and Space Administration (NASA): Improved determination of vector lithospheric magnetic anomalies from Magsat data, $18,000, 1992 to 1993.
National Aeronautics and Space Administration (NASA): Towards developing an analytical procedure of defining the equatorial electrojet for correcting satellite magnetic anomalies, $70,000, 1989 to 1991.
National Aeronautics and Space Administration (NASA): Improving the geological interpretation of Magnetic and Gravity Satellite anomalies, $70,000, 1987 to 1989.

• E-mail Prof. Ravat, at dhananjay.ravat@uky.edu for electronic copies of publications
• Wang, B., E.S. Krebes, D. Ravat (2008) High-precision potential-field and gradient-component transformations and derivative computations using cubic B-splines, Geophysics, 73 (I35), I42
• Salem, A., S. Williams, J.D. Fairhead, R. Smith, D. Ravat (2008) Interpretation of magnetic data using tilt-angle derivatives, Geophysics, 73 (L1), L10
• Korhonen, J., (and the rest alphabetically), J.D. Fairhead, M. Hamoudi, K. Hemant, V. Lesur, M. Mandea, S. Maus, M. Purucker, D. Ravat, T. Sazonova, E. Thebault, World Digital Magnetic Anomaly Map, 1:50 000 000, 1 sheet and 1 DVD, First Edition, Paris, CCGM-CGMW/UNESCO, 2007
• Salem, A., S. Williams, J.D. Fairhead, D. Ravat, R. Smith (2007) Tilt-depth method: A simple depth estimation method using first order magnetic derivatives, The Leading Edge, 26, 1502-1505
• Hemant, K., E. Thébault, M. Mandea, D. Ravat, S. Maus (2007) Magnetic anomaly map of the world: merging satellite, airborne, marine and ground-based magnetic data sets, Earth and Planetary Science Letters, 260, 56-71
• Maus, S., T. Sazonova, K. Hemant, J. D. Fairhead, D. Ravat (2007) National Geophysical Data Center candidate for the World Digital Magnetic Anomaly Map, Geochemistry, Geophysics, Geosystems, 8 (Q06017), doi:10.1029/2007GC00
• Ravat, D., A. Pignatelli, I. Nicolosi, M. Chiappini (2007) A study of spectral methods of estimating the depth to the bottom of magnetic sources from near-surface magnetic anomaly data, Geophysical Journal International, 169, 421-434
• Bektas, O., D. Ravat, A. Büyüksarac, F. Bilim, A. Ates (2007) Regoinal geothermal characterization of East Anatolia from aeromagnetic, heat flow and gravity data, Pure and Applied Geophysics, 164, 975-998
• Ravat, D. (2007) Upward and downward continuation, Encyclopedia of Geomagnetism and Paleomagnetism (Editors: D. Gubbins & E. Herrero-Bervera), First Edition, Springer, 1020 pages, In Press, ISBN=1402039921 (bookchapter)
• Ravat, D. (2007) Reduction to pole, Encyclopedia of Geomagnetism and Paleomagnetism (Editors: D. Gubbins & E. Herrero-Bervera), First Edition, Springer, 1020 pages, In Press, ISBN=1402039921 (bookchapter)
• Ravat, D. (2007) Crustal Magnetic Fields, Encyclopedia of Geomagnetism and Paleomagnetism (Editors: D. Gubbins & E. Herrero-Bervera), First Edition, Springer, 1020 pages, In Press, ISBN=1402039921 (bookchapter)
• Hinze, W.J., B. Coakley, T. Hildenbrand, G.R. Keller, X. Li, D. Plouff, D. Ravat, M. Webring (2006) Reply to "Vasanthi, A., Sharma, K.K., and Mallick, K., Discussion on the paper `New standards for reducing gravity data: The North American gravity database' by Hinze, W.J, Aiken, C.J. and 20 others: Geophysics, v. 70, No. 4, pp. J25-J32, 2005, Geophysics, 71, X32-X33
• Bexfield, C.E., J.H. McBride, A.J.M. Pugin, D. Ravat, S. Biswas, W.J. Nelson, T.H. Larson, S.L. Sargent, M.A. Fillerup, B.E. Tingey, L. Wald, M.L. Northcott, J.V. South, M.S. Okure, and M.R. Chandler (2006) Integration of P- and SH-wave high resolution seismic reflection and micro-gravity techniques to improve interpretation of shallow subsurface structure: New Madrid seismic zone, Tectonophysics, 420, 5-21
• Gaya-Pique, L.R., D. Ravat, A. De Santis, and J.M. Torta (2006) New model alternatives for improving the representation of the core magnetic field of Antarctica, Antarctic Science, DOI: 10.1017/S0954102006000095, 18, 101-109
• Hinze, W.J., C. Aiken, J. Brozena, B. Coakley, D. Dater, G. Flanagan, R. Forsberg, T. Hildenbrand, G. R. Keller, J. Kellogg, R. Kucks, X. Li, A. Mainville, R. Morin, M. Pilkington, D. Plouff, D. Ravat, D. Roman, J. Urrutia-Fucugauchi, M. Véronneau, M. Web (2005) New standards for reducing gravity data: The North American gravity database, Geophysics, DOI: 10.1190/1.1988183, 70, J25-J32
• Salem, A., D. Ravat, R. Smith, and K. Ushijima (2005) Interpretation of magnetic data using an enhanced local wavenumber (ELW) method, Geophysics, DOI: 10.1190/1.884828, 70, L7-L12
• Salem, A., D. Ravat, T.J. Gamey, K. Ushijima (2005) Chapter 16: Detection of buried steel drums from magnetic anomaly data using an artificial intelligence technique, pp.513-523, In D.K. Butler (eds), Near-Surface Geophysics, Investigations in Geophysics No. 13, Tulsa, Society of Exploration Geophysicists, 732p. pages, ISBN=1-56080-130-1 (bookchapter)
• Salem, A., D. Ravat, M.F. Mushayandebvu, K. Ushijima (2004) Linearized least-squares method for interpretation of potential-field data from sources of simple geometry, Geophysics, 69, 783-788
• Milligan, P.R., R. Franklin, D. Ravat (2004) A new generation of Magnetic Anomaly Grid Database of Australia (MAGDA) - use of independent data increases the accuracy of long wavelength components of continental-scale merges, Preview, 113, 25-29
• Ravat, D., and P.S. Millegan (eds.), Geophysics from Space (special Grav/Mag section), The Leading Edge, 22(8), 2003
• Salem, A., and D. Ravat (2003) A combined analytic signal and Euler Method (AN-EUL) for automatic interpretation of magnetic data, Geophysics, 68, 1952-1961
• Ravat, D., T.G. Hildenbrand, and W. Roest (2003) New way of processing near-surface magnetic data: The utility of the Comprehensive Magnetic Field Model, The Leading Edge, 22, 784-785
• Ravat, D., and P.S. Millegan (2003) An introduction - Geophysics: Doing it in space, The Leading Edge, 22, 757-758
• Ravat, D. (2003) New uses of continuous coverage satellite magnetic field data in studying the Earth's lithosphere In P. Stauning, H. Lühr, P. Ultre-Guerard, J. LaBrecque, M. Purucker, F. Primdahl, J. Jorgensen, F. Christiansen, P. Hoeg, and K. Lauritsen (eds), OIST-4 Proceedings, Copenhagen, Narayana Press, 79-82 pages (bookchapter)
• Bankey, V., and 17 others, Digital data grids for the magnetic anomaly map of North America (http://pubs.usgs.gov/of/2002/ofr-02-414/), U.S. Geological Survey Open-File Report, 02-414, 2002
• Wheeler, R.L., and D. Ravat (editors, special issue), The Illinois basin: Seismicity, Quaternary faulting, and Seismic Hazard, Seismological Research Letters, 73(5), 2002
• Wheeler, R.L., and D. Ravat (2002) Introduction to the special issue on Seismic hazards of the Illinois basin, Seismological Research Letters, 73, 590-596
• Hildenbrand, T.G., J.H. McBride, and D. Ravat (2002) The Commerce geophysical lineament and its possible relation to Mesoproterozoic igneous complexes and large earthquakes in the central Illinois Basin, Seismological Research Letters, 73, 640-659
• Salem, A., D. Ravat, T.J. Gamey, and K. Ushijima (2002) Analytic signal approach and its applicability in environmental magnetic investigations, Journal of Applied Geophysics, 49, 231-244
• Ravat, D., K. Kirkham, and T.G. Hildenbrand (2002) A source-depth separation filter: Using the Euler method on the derivatives of total intensity magnetic anomaly data, The Leading Edge, 21, 360-365
• Ravat, D., K.A. Whaler, M. Pilkington, T. Sabaka, and M. Purucker (2002) Compatibility of high-altitude aeromagnetic and satellite-altitude magnetic anomalies over Canada, Geophysics, 67, 546-554
• Ravat, D. B. Wang, E. Wildermuth, P.T. Taylor (2002) Gradients in the interpretation of Satellite-altitude Magnetic Data: An Example from Central Africa, J. Geodynamics, 33, 131-142
• Ravat, D. and M. Purucker (2002) Unraveling the Magnetic Mystery of the Earth's Lithosphere: The Background and the Role of the CHAMP Mission In C. Reigber, H. Luehr, P. Schwintzer (eds), In: C. Reigber, H. Luehr, P. Schwintzer (Eds.), First CHAMP Mission Results for Gravity, Magnetic and Atmospheric Studies, Springer-Verlag, Heidelberg, Heidelberg, Springer-Verlag, 251-260 pages (bookchapter)
• Salem, A., D. Ravat, R. Johnson, and K. Ushijima (2001) Detection of Buried Steel Drums from Magnetic Anomaly Data using a Supervised Neural Network, Journal of Environmental Engineering and Geophysics, 6, 115-122
• Salem, A., K. Ushijima, T.J. Gamey, and D. Ravat (2001) Automatic detection of UXO from airborne magnetic data using a neural network, Journal of Subsurface Sensing Technologies and Applications, 2 (3), 193-215
• Purucker, M., D. Ravat, H. Frey, C. Voorhies, T. Sabaka, and M. Acuna (2000) An altitude-normalized magnetic map of Mars and its interpretation, Geophysical Research Letters, 27, 2449-2452
• Ravat, D. (2000) Magnetohydrodynamic Waves in the Earth In P.L. Hancock and B.J. Skinner (eds), The Oxford Companion to the Earth, P.L. Hancock and B.J. Skinner (eds.), Oxford University Press, Oxford, U.K., Oxford, U.K., Oxford University Press, 632 pages (bookchapter)
• Ravat, D. (2000) Magnetic Field: Origin of Internal Field In P.L. Hancock and B.J. Skinner (eds), The Oxford Companion to the Earth, P.L. Hancock and B.J. Skinner (eds.), Oxford University Press, Oxford, U.K., Oxford, U.K., Oxford University Press, 631 pages (bookchapter)
• Ravat, D. (2000) Magnetic Pole In P.L. Hancock and B.J. Skinner (eds), The Oxford Companion to the Earth, P.L. Hancock and B.J. Skinner (eds.), Oxford University Press, Oxford, U.K., Oxford, U.K., Oxford University Press, 630-631 pages (bookchapter)
• Ravat, D. (2000) Geomagnetism: Polarity Reversals In P.L. Hancock and B.J. Skinner (eds), The Oxford Companion to the Earth, P.L. Hancock and B.J. Skinner (eds.), Oxford University Press, Oxford, U.K., Oxford, U.K., Oxford University Press, 422-423 pages (bookchapter)
• Ravat, D. (2000) Geomagnetism: Main Field, Secular Variation and Westward Drift In P.L. Hancock and B.J. Skinner (eds), The Oxford Companion to the Earth, P.L. Hancock and B.J. Skinner (eds.), Oxford University Press, Oxford, U.K., Oxford, U.K., Oxford University Press, 421-422 pages (bookchapter)
• Ravat, D. (2000) Geomagnetism: External Fields In P.L. Hancock and B.J. Skinner (eds), The Oxford Companion to the Earth, P.L. Hancock and B.J. Skinner (eds.), Oxford University Press, Oxford, U.K., Oxford, U.K., Oxford University Press, 420-421 pages (bookchapter)
• Ravat, D. (2000) Geomagnetic Measurement, Techniques and Surveys In P.L. Hancock and B.J. Skinner (eds), The Oxford Companion to the Earth, P.L. Hancock and B.J. Skinner (eds.), Oxford University Press, Oxford, U.K., Oxford, U.K., Oxford University Press, 417-420 pages, ISBN=978-0-19-8540 (bookchapter)
• Ravat, D. (2000) Curie Temperature In P.L. Hancock and B.J. Skinner (eds), The Oxford Companion to the Earth, P.L. Hancock and B.J. Skinner (eds.), Oxford University Press, Oxford, U.K., Oxford, U.K., Oxford University Press, 202-203 pages, ISBN=978-0-19-8540 (bookchapter)
• Ravat, D. (2000) Aeromagnetic Surveying In P.L. Hancock and B.J. Skinner (eds), The Oxford Companion to the Earth, P.L. Hancock and B.J. Skinner (eds.), Oxford University Press, Oxford, U.K., Oxford, U.K., Oxford University Press, 6-7 pages, ISBN=978-0-19-8540 (bookchapter)
• Ravat, D., and M. Purucker (1999) The future of satellite magnetic anomaly studies is bright!, The Leading Edge, 18, 326-329
• Ravat, D., Z. Lu, and L.W. Braile (1999) Velocity-density relationships and modeling the lithospheric density variations of the Kenya Rift, Tectonophysics, 302, 225-240
• Ravat, D., and P.T. Taylor (1998) Determination of depths to centroids of three-dimensional sources of potential-field anomalies with examples from environmental and geologic applications, Journal of Applied Geophysics, 39, 191-208
• Hildenbrand, T.G. and D. Ravat (1997) Geophysical Setting of the Wabash Valley Fault System, Seismological Research Letters, 68, 567-585
• Taylor, P.T., and D. Ravat (1997) Reply to comments by R. Pucher and T. Wonik on 'An interpretation of the Magsat anomalies of central Europe, J. Applied Geophys., 34, 83-91,', Journal of Applied Geophysics, 36, 217-219
• Ravat, D. (1996) Analysis of the Euler method and its applicability in environmental magnetic investigations, Journal of Environmental Engineering and Geophysics, 1, 229-238
• Ravat, D. (1996) Magnetic properties of unrusted steel drums from laboratory and field-magnetic measurements, Geophysics, 61, 1325-1335
• Taylor, P.T., and D. Ravat (1995) An interpretation of the Magsat anomalies of central Europe, Journal of Applied Geophysics, 34, 83-91
• Ravat, D., R.A. Langel, M. Purucker, J. Arkani-Hamed, and D.E. Alsdorf (1995) Global vector and scalar Magsat magnetic anomaly maps, Journal of Geophysical Research - Solid Earth, 100, 20111-20136
• Ravat, D., W.J. Hinze, and P.T. Taylor (1993) European tectonic features observed by Magsat, Tectonophysics, 220, 157-173
• Ravat, D. and W.J. Hinze (1993) Considerations of variations in ionospheric field effects in mapping equatorial lithospheric Magsat anomalies, Geophysical Journal International, 113, 387-398
• Taylor, P.T., W.J. Hinze, and D. Ravat (1992) The Search for Crustal Resources: Magsat and Beyond, Adv. Space Res., 12, (7)5-(7)15
• Ravat, D., W.J. Hinze, and R.R.B. von Frese (1992) Analysis of MAGSAT Magnetic Contrasts across the African and South American Lithospheric Plates, Tectonophysics, 212, 59-76
• Hinze, W.J., R.R.B. von Frese, and D. Ravat (1991) Mean Magnetic Contrasts between Oceans and Continents, Tectonophysics, 192, 117-128
• Ravat, D., W.J. Hinze, R.R.B. von Frese (1991) Lithospheric Magnetic Property Constrasts within the South American Plate Derived from Damped Least-Squares Inversion of Satellite Magnetic Data, Tectonophysics, 192, 159-168
• Goyal, H.K., R.R.B. von Frese, W.J. Hinze, and D. Ravat (1990) Statistical Prediction of Satellite Magnetic Anomalies, Geophysical Journal International, 102, 101-111
• von Frese, R.R.B., W.J. Hinze, C.A. McGue, and D. Ravat (1989) Use of Satellite Magnetic Anomalies for Tectonic Lineament Studies, in Qureshy, M.N., and W.J. Hinze (eds.), Regional Geophysical Lineaments - Their Tectonic and Economic Significance, Geol. Survey of India Memoir, 12, 171-180
• von Frese, R.R.B., D. Ravat, W.J. Hinze, and C.A. McGue (1988) Improved Inversion of Geopotential Field Anomalies for Lithospheric Investigations, Geophysics, 53, 375-385
• Ravat, D., L.W. Braile, and W.J. Hinze (1987) Earthquakes and Plutons in the Midcontinent - Evidence from the Bloomfield Pluton, Seismological Research Letters, 58, 41-52