Figure 6 - uploaded by T. J. Majumdar
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Map showing correlation of subsurface topography (highs/lows) with known structural / tectonic features and sedimentary thickness (available from ONGC ship-borne surveys)
Source publication
Geosat altimeter Exact Repeat Mission (ERM) data over a part of western offshore, India have been used to determine the prospecting geoid and the free‐air gravity anomaly. The sea surface height measured by satellite altimeter, when corrected for atmospheric propagation delays and other dynamic (time‐varying) oceanic variabilities, conforms to an e...
Context in source publication
Context 1
... geoid undulations calculated using Rapp's model (up to degree and order 50) are shown in Fig.4 ( Rapp, 1982Rapp, , 1983Rapp, , 1986. The contour map of the prospecting geoid over a part of western offshore, India, as obtained using Geosat altimeter data, is shown in Fig.5 The interpreted map is shown in Fig.6, which indicates that the Bombay High (a prominent oil-bearing structure) is observed as a prominent geoidal high, while the South Bombay, Surat, Ratnagiri and self-margin depressions are associated with geoidal lows (Biswas, 1982;Curray et al., 1982). ...
Citations
... The residual geoid and free-air gravity imageries generated over the Indian offshore are shown in Figs. 4 and 5 respectively. Latitude and, 1973; Srivastava et al., 1992 Srivastava et al., , 1995 Mohanty et al., 1999). 3D image generated using free-air gravity over the Bombay High region is shown inFig. ...
In this study, ERS-1 altimeter data over the Indian offshore have been processed for deriving marine geoid and gravity. Processing
of altimeter data involves corrections for various atmospheric and oceanographic effects, stacking and averaging of repeat
passes, cross-over correction, removal of deeper earth and bathymetric effects, spectral analyses and conversion of geoid
into free-air gravity anomaly. Methods for generation of residual geoid and free-air gravity anomaly using high resolution
ERS-1 168 day repeat altimeter data were developed. High resolution detailed geoid maps, gravity anomaly and their spectral
components have been generated over the Indian offshore using ERS-I altimeter data and ARCGIS system. A number of known megastructures
over the study area have been successfully interpreted e.g. Bombay High, Saurastra platform, 90° east ridge etc. from these
maps.
