Tectonomagnetic study in the seismoactive area of Narmada-Son lineament,central India: Preliminary results on repeat field observations |
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| Authors: | S Y Waghmare S D Pimprikar P B Gawali L Carlo A G Patil |
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| Institution: | (1) Oil India Limited, Duliajan, Assam, India;(2) Department of Geophysics, BHU, Varanasi, India |
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| Abstract: | Repeated measurements of the total geomagnetic field on the five profiles have revealed a picture of stress-induced tectonomagnetic
effect in the form of secular variation of the total geomagnetic field in the tectonically and seismically active area of
Jabalpur and adjoining areas of the Narmada-Son lineament (NSL), central India. For this experiment, a reference base station
was established within the study area at Jabalpur. Using proton precession magnetometers with a sensitivity of 0.1 nT, simultaneous
measurements of total geomagnetic field were made annually at the base and all field stations. Five cycles of repeated observations
have been performed between 2003 and 2007. For data analysis, a difference method has been applied and the residuals have
been calculated as secular variations of the total geomagnetic field with values ranging from ±0.1nT to about ±14.6nT/yr over
the different stations. The anomalies in secular variation of the total geomagnetic field may be related to anomalous accumulation
of tectonic stresses and tensions on the deep fault zones and crustal blocks due to recent geodynamic processes and active
geological inhomogeneities in the NSL. |
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