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P.B.Gawali et al. secular changes at DD’ and EE’ more or less follow a similar trend. Since the whole area of NSL is under stress it may cause changes in the total geomagnetic field or it could also be that the stresses are building due to active geological inhomogeneities along these profiles. The space-time pattern of residual geomagnetic field around Jabalpur and adjoining areas in NSL indicates certain characteristic features which have been interpreted as stress change in the crust. The small-scale secular variation anomalies of the crustal origin may be a manifestation of tectonically active parts and joints of different tectonic crustal blocks of NSL. The secular variation anomalies of total geomagnetic field may have resulted in response to the gradual movement of Indian plate in NE-SW direction and collision with Eurasian plate building stresses and tension on the fault systems of the NSL zone. However, dominant contribution for secular changes in the total geomagnetic field in the crust originating from the stress induced tectonomagnetic (piezomagnetic) effect rather than fluids produced electrokinetic effect. In the present scenario taking into account the long tectonic and seismicity history of the NSL belt, it seems possible that both piezomagnetic and electrokinetic mechanisms may be operative. But, since no earthquake of measurable magnitude occurred in the surveyed region during the duration of experiment, such general conclusions may be premature. However, data gathered in present surveys will help in investigating the tectonomagnetic effect of the impending seismic activity. ACKNOWLEDGEMENTS The authors are thankful to the Director, Indian Institute of Geomagnetism, New Panvel (W), Navi Mumbai for encouraging and supporting the project “Tectonomagnetic investigation in Jabalpur-Kosamghat area in Central India” and permission to publish this work. The authors are also thankful to the Director, Geological Survey of India, Jabalpur (M.P.) for providing necessary help during fieldwork. Mr. S.B.Waknis and Mr.B.I. Panchal are gratefully acknowledged for drawing the figures. REFERENCES Arora, B.R., 1988. Tectonomagnetic studies in India. In: Guha, S.K.K., Patwardhan, A.M. ( Eds.) Earthquake Prediction-Present Status. Deptt. of Geology, University of Poona, Pune, India pp. 53-62. Arora, B.R.& Singh, B.P., 1992. Geomagnetic and geoelectric 72 investigations for seismicity and seismotectonics of the Himalayan region. Mem. Geol. Soc. India 23, 223-263. Arora, B.R. & Waghmare, S.Y., 1984. Delineation of longwavelength magnetic anomalies over Central India by Rectangular Harmonic analysis, Proc. Indian Acad. Sci. (Earth Planet. Sci.) 93, 353-362. Arora, B.R., Waghmare, S.Y. & Mahashabde, M.V., 1995. Geomagnetic depth sounding along the Hirapur– Mandla-Bhandara profile, Central India, Mem. Geol. Soc. India 31, 519-535. Choubey, V.D., 1971. Narmada-Son lineament, India. Nature Phys. Sci., 232, 38-40. Djadkov, P.G., Mikheev, O.A., Minenko, M.I. & Sobolev O.A., 2007. Some results of tectonomagnetic monitoring in the epicentral zone of the M7.5 Altay earthquake, September 27, 200, Annals of Geophysics, 50, 31-37. Eremenco, N.A. & Negi, B.S., 1968. Tectonic map of India, Oil and Natural Gas Commission, Dehradun, Printed at the 101(H.L.O.) printing group of Survey of India. Ghosh, D.B., 1976. The nature of Narmada-Son lineament. In: Seminar volume on Tectonics and Metallurgy of South and East Asia, Geol. Surv. India Misc. Publ., 34, 119-132. Gokarn, S.G. & Singh, B.P., 2000. Magnetotelluric technique. In:Varma, O.P., Mahadevan, T.M. (Eds.) Research highlights in Earth System Science, DST’s Spl. Publication, Ind. Geol. Cong., 1, 123-142. Gokarn, S.G., Rao, C.K., Gupta, G., Singh, B.P. & Yamashita, M., 2001. Deep crustal structure in Central India using Magnetotelluric studies, Geophys. J. Int., 144, 685-694. Gough, D.I., 1973. The interpretation of magnetometer array studies. Geophys, J. R. Ast. Soc., 35, 83-98. Gough, D.I., 1992. Electromagnetic exploration for fluids in the Earth’s crust, Earth Science Review 32, 3-18. Grabowska, T. & Bojdys, G., 2004. Analysis of geomagnetic field along seismic profile P4 of the International project POLONAISE’ 97, Tectonophysics, 383, 15-28. Gupta, H.K., Chadha,R.K., Rao, M.N., Narayana, B.L., Mandal, P., Ravi Kumar, M. & Kumar, N., 1997. The Jabalpur Earthquake of May 22, 1997, Jour. Geol. Soc. India, 50, 85-91. Hamano, Y., 1983. Experiment on the stress sensitivity of natural remanent magnetization , J. Geomag. Geoelectr., 35, 155-172. Honkura, Y., 1981. Electric and magnetic approach to earthquake prediction: In: Rikitake, T. (Ed.), Current research in earthquake prediction I, DEPS02, Reidel Publication Co., Center of Academic publication, Tokyo, Japan, pp 301-383. Honkura, Y. & Koyama, S., 1976. On a problem in earthquake prediction research based on the survey
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