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Rao, V. K.
- Velocity Structure in Parts of the Gondwana Godavari Graben
Abstract Views :208 |
PDF Views:2
Authors
Affiliations
1 National Geophysical Research Institute, Hyderabad, 500 007, IN
1 National Geophysical Research Institute, Hyderabad, 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 56, No 4 (2000), Pagination: 373-384Abstract
Godavari graben, a palaeorift on the east coast of India, has been studied to delineate sedimentary thickness and basement configuration. First arrival seismic refraction data in the Chintalapudi sub-basin of Godavari graben have been utilized for 2-D ray trace modeling. Results indicate a thee layer velocity model, with velocities of 2.3-2.4, 3.2, and 4.0 kms-1 for the Gondwana (Permian to Cretaceous) sediments. Maximum depth to the basement, of velocity 55-57 kms-1, is to about 3 km in the deepest part of the sub-basin. The basement is possibly the Eastern Ghats suite of rocks. These results are in conformity with the thickness of stratigraphic sequences in a deep bore well in the basin, Another layer of velocity 5.8-6.3 kms-1 is present at about 4 km depth through out the study region, representing the base of Eastern Ghats Suite of rocks.Keywords
Godavari Graben, Gondwana, Chintalapudi Sub-Basin, Precambrian Basement, Seismic Refraction, Seismic Velocity.- Crustal Velocity Model in the Eastern Part of the Indian Peninsular Shield
Abstract Views :195 |
PDF Views:2
Authors
H. C. Tewari
1,
V. K. Rao
1
Affiliations
1 National Geophysical Research Institute, Hyderabad 500057, IN
1 National Geophysical Research Institute, Hyderabad 500057, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 36, No 5 (1990), Pagination: 475-483Abstract
The velocity analysis of the first arrival refraction data, along the two deep seismic sounding profiles in the eastern part of the Indian Peninsular shield has yielded a zone of high velocity at 3 to 15km depth within the limits of the Eastern Ghat Mobile Belt towards east of the Cuddapah basin. The analysis also indicates that the crustmantle boundary in the eastern part of the Indian shield is highly disturbed due to the intrusion from the upper mantle through the lower crust and, therefore, can be termed as transitional.Keywords
Geophysics, Seismology, Eastern Ghat Mobile Belt, Cuddapah Basin, Crustal Velocity Model.- Finite Element Gravity Regional and Residual Anomalies and Structural Fabrics of Northwest Ganga Basin
Abstract Views :187 |
PDF Views:2
Authors
Affiliations
1 Department of Applied Geology, University of Madras, Chennai, IN
2 National Geophysical Research Institute, Hyderabad, IN
1 Department of Applied Geology, University of Madras, Chennai, IN
2 National Geophysical Research Institute, Hyderabad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 54, No 2 (1999), Pagination: 169-178Abstract
The separation of the regional gravity anomaly by any of the existing techniques has one common drawback, i.e. the Bouguer gravity values over the anomalous zone enter into the computations. In order to overcome this, a new scheme, based on the finite element approximation, is suggested to compute the regional anomaly. The uniqueness of this approach is that except a few discrete gravity values coinciding with the nodes of the element superimposing the map space, often very large, no other gravity data are invoked to compute the regional anomaly. As a case study, regional - residual anomaly separation has been carried out for the north west Ganga Basin. This area is chosen as it is tectonically very active, and based on the regional and residual gravity anomalies, we can unfold the imprints of various tectonic episodes along the lndo - Eurosian plate boundary. While the regional gravity anomaly shows possible association with deep-seated faults along the rivers Yarnuna and Chambal, the seismicity appears to be correlated with the residual gravity anomaly around Delhi.Keywords
Geophysics, Finite Element Analysis, Regional Gravity, Ganga Basin.- Missing Granitic Crust (?) in the Godavari Graben of Southeastern India
Abstract Views :190 |
PDF Views:161
Authors
O. P. Pandey
1,
V. K. Rao
1
Affiliations
1 National Geophysical Research lnstitute, Uppal Road, Hyderabad - 500 007, IN
1 National Geophysical Research lnstitute, Uppal Road, Hyderabad - 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 67, No 3 (2006), Pagination: 307-311Abstract
Detailed analysis of seismic signatures of the Godavari graben together with available geological and geophysical informations suggests that the granitic crust, especially in the axial part of the graben, may be altogether missing. There is a possibility that Gondwana sediments rest directly over the granulitic basement.Keywords
Seismic Signatures, Basement Relationships, Godavari Graben, Southeastern India.- Sedimentology and Sequence Stratigraphy of Hydrocarbon Bearing Mandapeta Pays: A Braided Fluvial Reservoir, Krishna-Godavari Basin
Abstract Views :181 |
PDF Views:130
Authors
V. K. Rao
1,
Yadagiri Kotha
2
Affiliations
1 Directorate General of Hydrocarbons, Ministry of Petroleum, New Delhi, IN
2 ONGC, Jorhat, Assam, IN
1 Directorate General of Hydrocarbons, Ministry of Petroleum, New Delhi, IN
2 ONGC, Jorhat, Assam, IN