Physics – Geophysics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pepi...25..226n&link_type=abstract
(International Union of Geodesy and Geophysics, Symposium on Electrical Conductivity and the Characteristics of the Asthenospher
Physics
Geophysics
7
Earth Planetary Structure, Geomagnetism, Magnetic Anomalies, Magnetic Storms, Magnetic Variations, Spectrum Analysis, Earth Crust, Himalayas, India, Sudden Storm Commencements
Scientific paper
Anomalies in the horizontal and vertical components of induced geomagnetic variations observed at Sabhawala magnetic observatory in the foothills of the Himalayas are analyzed in order to determine the subsurface geology responsible for the anomalies. Magnetogram records of 42 geomagnetic bays and 19 sudden storm commencements were examined to obtain indicated vectors, horizontal disturbance vectors, and the period and frequency dependence of induced variations observed during seven storms. The results indicate the presence of a deep-seated conductor lying south of Sabhawala in an east-west direction, with a linear dimension greatly surpassing its depth and width. The conductor may be identified with a rise of the asthenosphere south of Himalayan range, which, together with currents induced in the sedimentary trough running south of and parallel to the Himalayas, are proposed to be responsible for the induced variations.
Agarwal A. K.
Nityananda N.
Singh B. P.
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