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  • 1
    Monograph available for loan
    Monograph available for loan
    Twenty years research & development activity of NGRI (1982)
    Hyderabad : Nat. Geoph. Res. Inst.
    Details Availability
    Call number: MR 90.1061
    Type of Medium: Monograph available for loan
    Pages: 413 S.
    Series Statement: Geophysical research bulletin : special issue / National Geophysical Research Institute, Council of Scientific and Industrial Research, India
    Language: English
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Ambiguity in the solution to the velocity inversion problem and a solution by joint inversion of seismic refraction and wide-angle reflection times (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 124 (1996), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: In a multilayered earth system no refraction signal will be generated from the top of a layer that has a seismic velocity less than that of the layer immediately above. The interpretation of refraction data in such a situation cannot provide any information about the low-speed layer (LSL), and its presence leads to the overestimation of depths to the bottom of the overlying or cap layer and all subsequent underlying layers. This is the velocity inversion (VI) problem of seismic refraction work. Other geological/geophysical information is required to solve the VI problem. In this respect, wide-angle reflections from the bottom of the LSL may constitute the most reliable information, since they are observed as very strong arrivals on the seismogram after first arrivals. This paper shows that, even if reflections from the bottom of the LSL are used, the solution (i.e. the thickness of the cap layer, and the thickness and velocity of the low-speed layer) to the VI problem is still ambiguous. However, use of the wide-angle reflected phase limits the number of solutions. A method of joint inversion of traveltimes for refractions and wide-angle reflections from the bottom of the LSL is proposed to calculate the thickness of the cap layer and that of the LSL, the velocity of the LSL having been constrained from other information. The reliability of the method has been tested on synthetic data using various initial models. Application to field data demonstrates the practical feasibility of the method by comparing the result with the available solution for the region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1996.tb06365.x
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  • 3
    Electronic Resource
    Electronic Resource
    Crustal structure of the west Bengal basin, India from deep seismic sounding investigations (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 111 (1992), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Basement and sub-basement crustal configuration of parts of the west Bengal basin has been delineated from inverse and forward modelling of refraction and wide-angle reflection data obtained along two east-west profiles: (a) Beliator-Burdwan-Bangaon (profile-1) about 180 km long and (b) Gopali-Tamluk-Port Canning (profile-2) about 140 km long. The study has revealed the existence of four groups of prominent refractors (velocities 1.7–2.1 km s−1, 2.7–3.2 km s−1, 3.7–4.2 km s−1, and 4.6–5.3 km s−1) overlying the crystalline basement with a velocity of 5.8–6.2 km s−1. Rajmahal Traps (velocity 4.6–5.3 km s−1, averaging 4.8 km s−1) occur beneath the base of the Tertiary sediments in the middle parts of the profiles. The presence of sub-Trappean Gondwanas is also indicated from the wide-angle reflection modelling supported by deep well lithological information. In general, depth to the basement is found to increase from west to east, with a maximum depth of around 10 to 11 km at the extreme eastern parts of the profiles. A basement upwarp, with a sharp flexure west of Bishnupur on profile-2 in combination with the fault west of Shantipur on profile-1 possibly brings into focus the regionally extending NNE-SSW ‘Hinge zone’. A low velocity layer (LVL) of about 2 to 3 km thickness (velocity 5.6–5.8 km s−1) has been inferred in the upper crust in this area. In general the thickness of the upper (including the sedimentary column) and the middle (6.4–6.6 km s−1 velocity) parts of the crust is found to be larger (thickness varying between 22 and 27 km) than the lower crustal column (interval velocity 6.8–7.0 km s−1 with a thickness of 5 to 10 km). The Moho lies at varying depths of 36 to 26 km along profile-1, with a prominent domal feature of about 40 km width between Satgachia and west of Shantipur. In the middle part of profile-2 the Moho occurs at depths of 32 to 34 km, with a mild flexure east of Tamluk. Configuration of the Moho indicates that the crust is more akin to continental in nature in the western and middle parts of the basin, whereas significantly thinned continental crust is indicated in the eastern and southeastern parts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1992.tb00554.x
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  • 4
    Electronic Resource
    Electronic Resource
    Structure of the crystalline basement in the West Bengal basin, India, as determined from DSS studies (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 124 (1996), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Deep seismic sounding data were acquired in the West Bengal basin, India, along two profiles: (i) Bishnupur–Palashi–Kandi, along a line about 227 km long in the north–south direction and (ii) Taki–Arambagh, along a line about 120 km long in the east–west direction. Seismic refraction and wide-angle reflection data were recorded by continuous profiling using two 60-channel digital seismic units (DFS-V) with an 80 m geophone group interval and 4 ms sampling rate. These data were interpreted in order to delineate the basement configuration. The 2-D models of the seismic data both indicate a five-layer velocity structure above the Archaean crystalline basement (5.9–6.2 km s−1). A low-velocity layer (4.0 km s−1) is inferred immediately above the basement in the shelf region of the basin corresponding to the Gondwana sediments (Upper Carboniferous to Lower Triassic) below the Rajmahal Traps (Upper Jurassic to Lower Cretaceous) of 4.6 to 4.8 km s−1 velocity, which is also confirmed from the nearby well data. The results along the Taki–Arambagh profile and the drilling results at the Jaguli (J-1) well are used to investigate whether Gondwana sediments and the Rajmahal Traps exist in the deep part of the Bengal basin. An additional layer of velocity 5.2–5.3 km s−1, delineated in the Palashi–Kandi profile overlying the basement, may correspond to the Singhbhum group of rocks of the Proterozoic.A structural contour map of the basement prepared from the present results indicates a south-easterly dip of the basement in general. The depth of the basement on the stable shelf of the basin gently increases to about 8 km and dips steeply, plunging to a maximum depth of 14 km in the deep basin. No structural high that can be related to the ‘Calcutta gravity high’ is found in the basement around the Hooghly River.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1996.tb06362.x
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  • 5
    Electronic Resource
    Electronic Resource
    Direct Calculation of Interval Velocities and Layer Thicknesses From Seismic Wide-Angle Reflection Times (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 125 (1996), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Wide-angle seismic reflection traveltimes generated by large explosions are used extensively to obtain both velocity and regional structure of the crust and upper mantle. the method most commonly used to calculate interval velocities and thicknesses (layer parameters) of a multilayered earth, supposed to consist of homogeneous, isotropic and horizontal layers, is based on Dix's (1955) interval velocity formula, which needs a prior estimate of the rms velocity and traveltimes at zero offset. Use of Dix's hyperbolic approximation to the non-hyperbolic wide-angle reflection times causes large errors in the determination of layer parameters. Currently, no direct method exists to extract the velocity information from such wide-angle seismic data. Here we propose a layer-stripping method, using the ray parameter, to calculate the layer parameters directly in a vertically heterogeneous earth from a set of wide-angle seismic reflection data. Synthetic reflection times contaminated by some realistic errors have been used to demonstrate the efficiency and reliability of the algorithms. Field examples using well-identified wide-angle reflection times illustrate the practical feasibility of the proposed method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1996.tb06532.x
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  • 6
    Electronic Resource
    Electronic Resource
    Multiple diving waves and high-velocity gradients in the Bengal sedimentary basin (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 121 (1995), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Seismic refraction and wide-angle reflection studies were carried out in the Bengal basin, India. Trace normalized record sections were produced from the digital data recorded in this sedimentary basin. The most significant feature observed in these seismograms is the presence of high-energy later arrivals which appear in arcuate shapes with their curvatures concave downwards. These arrivals are identified as free-surface reflected refractions (or multiple diving waves), which belong to the family of free-surface multiples. The nature and generation of these waves are demonstrated with the help of synthetic examples. It is found that the presence of high-velocity gradients in the top layers is a necessary prerequisite for the generation of these high-energy multiple diving waves. These later arrival multiples, along with the other primary phases present on the observed record section from the Bengal basin, have been used to prepare a well-constrained velocity model. The results bring out the presence of very high-velocity gradients (∼0.3–1.0 km s−1 km−1) in the sedimentary layers of the Bengal basin, which are an order of magnitude higher than those obtained in other sedimentary basins of India.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1995.tb06452.x
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  • 7
    Electronic Resource
    Electronic Resource
    Deep seismic sounding studies in the north Cambay and Sanchor basins, India (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 103 (1990), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Deep seismic sounding (DSS) studies have been carried out in the north Cambay and Sanchor sedimentary basins in western India along three lines covering about 350km. Seismic refraction and wide angle reflection data, pertinent to the sedimentary basin as well as the deep crustal section, have been recorded from 41 shot points using a 60 channel DFS-V digital recording system with 200 m geophone spacing and 4 ms data sampling. Extensive modelling and interpretation of a large number of seismic record sections reveal four sub-basins in the sedimentary section along these lines. Maximum depth to the granitic/Proterozoic basement (P-wave velocity 5.9–6.0 km s-1) is about 5000 m in the north Sanchor and the Patan sub-basins and about 5600 m in the south Sanchor sub-basin. The deepest part of the sedimentary basin is delineated within the Gandhinagar sub-basin where the basement depth reaches 7700 m. The Deccan Traps (P-wave velocity 4.3–4.8 km s-1) form the base of the Tertiary sediments, almost in the entire study area except the extreme northern part. There is also some indication of the presence of sub-Trappean Mesozoic sediments along this profile. Within the sedimentary basin two horst features, one near Diyodar (the Diyodar ridge) and the other northwest of Mehsana (the Unhawa ridge), are indicated by the seismic data consistent with the tectonics of the region.The thickness of the upper crust in this region does not exceed 15 km (P-wave velocity reaching 6.3km s-1). A prominent low-velocity zone (velocity 5.5 km s-1) occurs in the depth range from 10.5 to 12.5 km. The lower crust consists of two layers of velocities 6.6–6.9 km s-1 and 7.3–7.4 km s-1, the discontinuity between them occurring at 23–25 km depth. The Moho discontinuity (PM velocity 8.0 km s-1) lies at a depth of 31–33 km. The high-velocity (7.3–7.4 km s-1) lower crustal layer represents underplating of the crust due to mantle upwelling and rifting with large-scale extrusion of the Deccan volcanics. The large thickness of the Tertiary sediments in the Cambay basin and a relatively thin crust in the region suggest further rifting during the Tertiary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1990.tb05676.x
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  • 8
    Electronic Resource
    Electronic Resource
    Dependence of cytoplasmic calcium transients on the membrane potential in isolated nerve endings of the guinea pig
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 815 (1985), S. 203-208 
    Details
    ISSN: 0005-2736
    Keywords: (Guinea pig nerve) ; Arsenazo III ; Ca^2^+ transport ; Membrane potential ; Synaptosome
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0005-2736(85)90290-1
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  • 9
    Electronic Resource
    Electronic Resource
    Quantitative measurements of the cytosolic Ca^2^+ activity within isolated guinea pig nerve-endings using entrapped arsenazo III and quin2
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 858 (1986), S. 275-284 
    Details
    ISSN: 0005-2736
    Keywords: (Guinea pig nerve) ; Arsenazo III ; Ca^2^+ ; Cytosolic Ca^2^+ ; Quin2 ; Synaptosome
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2736(86)90332-9
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  • 10
    Electronic Resource
    Electronic Resource
    Post-storm mid-latitude green aurora and electron precipitation
    Amsterdam : Elsevier
    Planetary and Space Science 29 (1981), S. 405-413 
    Details
    ISSN: 0032-0633
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0032-0633(81)90084-2
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