Seafloor Geomagnetic Sounding near the 85.DEG.E Ridge in the Bay of Bengal.

Joseph, Emma; Iyengar, Rajagopal; D'Cruz, L. A.; Singh, B. P.

doi:10.5636/jgg.47.421

Cited by 2 publications

(2 citation statements)

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“…However, during the seafloor campaigns in 1991, 1992 and 1995, a land reference station was con-currently operated at stations Selam (SAL), Annamalainagar (ANN) and Tirunelveli (TIR) respectively. The results reported by Joseph et al (1995Joseph et al ( , 2000 and Subba Rao et al (2000) have used data from these reference sites in reducing and interpreting data from the seafloor sites. The horizontal fields particularly at the station Annamalainagar (even to that matter at Tirunelveli) have earlier been shown to contain significant anomalous fields .…”

Section: Selection Of the Normal Stationmentioning

confidence: 94%

“…Both these ridges are demonstrated to be traces of hotspots and constitute the most prominent tectonic elements of the Bay of Bengal (Curray et al, 1982). Although analysis and interpretation separately of the on-land (references cited above) and seafloor data (Joseph et al, 1995(Joseph et al, , 2000Subba Rao et al, 2000) has been carried out quite extensively, their combined interpretation has still not been attempted. The present paper is an attempt towards the integration and joint interpretation of the entire data generated so far.…”

Section: Introductionmentioning

confidence: 99%

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Integrated modeling of EM response functions from Peninsular India and Bay of Bengal

Arora

Rao

2014

Earth Planet Sp

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Existing sets of magnetovariational data from the large numbers of sites distributed across the peninsular India and those in the Bay of Bengal are reanalysed to obtain inter-site vertical and horizontal field transfer functions. Maps of induction arrows relocate the earlier reported conductive zones beneath the Palk-Strait and a regional scale anomaly in the offshore region, immediately southwest of the southern tip of Indian Peninsula, named South India Offshore Conductivity Anomaly (SIOCA). Period dependence of the induction arrows suggests that with increasing period SIOCA tends to control the induction pattern over the entire peninsula. Presentation of the horizontal transfer functions in the form of ellipses of anomalous currents helps to characterize the period and spatial behaviour of horizontal fields at seafloor sites. Integrated thin sheet modeling of the on-land and seafloor induction features suggest that the greater part of the anomalous behaviour of the horizontal fields at seafloor sites can be attributed to the shielding effects due to seawater. The weak anisotropic behaviour of the horizontal fields at selected sites can be explained in terms of the concentration of the induced currents in the sediment filled troughs on either side of the 85• E Ridge. Several lines of geophysical evidence favour the hypothesis that SIOCA, low velocity zone, low magnetization anomaly, all centered near the southern tip of the India, are the relics of the interaction of Marion Plume outburst with Indian lithosphere.

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Section: Selection Of the Normal Stationmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%