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  • 1
    Series available for loan
    Series available for loan
    Braunschweig : Inst. für Geophysik und Meteorologie der Techn. Univ. Braunschweig
    Associated volumes
    Call number: SR 93.0336(18)
    In: Geophysikalische Arbeiten sowie Mitteilungen aus Meteorologie und Astrophysik
    Type of Medium: Series available for loan
    Pages: 62 S.
    Series Statement: Gamma 18
    Language: German
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
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    Instituts für Geophysik und Meteorologie der TU Braunschweig
    In:  Mitteilungen, TU Braunschweig, Instituts für Geophysik und Meteorologie der TU Braunschweig, vol. 10, no. 18, pp. 1-226
    Publication Date: 1983
    Keywords: Absorption ; Data analysis / ~ processing ; Seismology ; Seismics (controlled source seismology) ; Elasticity
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  • 3
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    In:  DGG-Mittl., Münster, 3, vol. 75, no. 2, pp. 2-32, pp. L12311, (ISBN 0-471-26610-8)
    Publication Date: 1998
    Keywords: Deep seismic sounding (espec. cont. crust) ; Refraction seismics ; Reflection seismics ; Acoustics ; Travel time ; Earth model, also for more shallow analyses ! ; Velocity depth profile
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  • 4
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    Inst. f. Geophysik und Meteorologie
    In:  Geowissenschaftliche Arbeiten sowie Mitteilungen aus Meteorologie und Astrophysik (GAMMA), TU Braunschweig, Inst. f. Geophysik und Meteorologie, vol. 10, no. 18, pp. 1-226
    Publication Date: 1971
    Keywords: Applied geophysics ; Electromagnetic methods/phenomena
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A new method to estimate seismic-wave attenuation is presented on the basis of complex trace analysis. Various distortions occuring in ‘classical’ time-domain and Fourier-frequency-domain methods are not present in this method. As a by-product, an accurate estimate of the group traveltime can be derived. the effect of the dispersion, which is always associated with attenuation, can either be taken into account or can be disregarded by application of the method to the autocovariance functions of the wavelets.
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2017-10-02
    Description: The damping in theoretical waveforms is described phenomenologically and a classification is proposed. A method for studying the Earth's crust was developed which includes this damping as derived from reflection seismograms. Seismic wave propagation by absorption, attenuation of seismic waves by scattering, and dispersion relations are considered. Absorption of seismic waves within the Earth as well as reflection and transmission of elastic waves seen through boundary layer absorption are also discussed.
    Keywords: GEOPHYSICS
    Type: TUBS/GAMMA-36
    Format: application/pdf
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  • 7
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    In:  Geological Society Special Publication 240: 37-45.
    Publication Date: 2007-10-08
    Description: Fundamental understanding of the origin, geometry, extension and scale dependence of fluid pathways in fractured rock is still incomplete. We analysed fracture networks on different scales, based on data from fluorescent thin sections and borehole televiewer (BHTV) images, to obtain geometrical network parameters and to estimate fracture permeability in the vicinity of a mantle plume (Hawaii Scientific Drilling Project, HSDP). In the depth interval between 814 and 1088 m below sea-level, we observed microfractures in the fluorescent thin sections, and macroscopic fractures in the corresponding BHTV data from the same depth range. Initial modelling of the microscopic network from the fluorescent thin section taken at 1088 m below sea-level gives a clear indication that in this particular case the preferential hydraulic pathways on the microscopic scale are the microfractures in the olivine crystals. This is the only plausible explanation of high porosity (16.6%, based on core measurement), due to the observed vesicles and the corresponding low permeability of 10 {micro}darcy. Modelling hydraulic flow and calculation of permeability leads to similar values of permeability of 12.3 {micro}darcy, assuming a mean fracture aperture of 1 {micro}m and an exponential distribution function of the fractures. Detected structures from BHTV measurements were used to construct a macroscopic stochastic network to simulate the hydraulic flow. We found 337 fractures in the depth section from 783.5 to 1147.5 m below sea-level, which result in a linear frequency of 0.927 m-1. Assuming horizontal layers and constant fracture apertures of 100 {micro}m for all structures, leads to a first estimate of permeability of 77 mdarcy (7.7 x 10-14 m2) in this depth section. In a recent work, we showed that for data from the Continental Deep Drilling Project (KTB), the fracture density versus fracture length follows a power law. First results from the Hawaiian data suggest a similar relationship, despite all of the differences in the lithological conditions between both sites.
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  • 8
    Publication Date: 2003-05-01
    Description: — Knowledge of rock properties controlling the fluid movement is a basic prerequisite to understand the dynamical processes and the temperature and stress regime of the upper crust. Fracture networks were investigated on different scales to obtain quantitative results of fracture geometry like fracture length, orientation and fracture frequencies. Due to the scale effect, these parameters differ in several orders of magnitude in dependence of the scale of investigation. On the microscopic scale, fluorescent thin sections from cores were analysed and permeability was estimated for 2-D hydraulic networks. On the macroscopic scale, fracture parameters were determined from images of structural borehole measurements. The vicinity of the drill site represents the megascopic scale, where seismic reflectors were assumed as active hydraulic structures for construction of a fracture network. Compiling the fracture densities from all investigated scales and taking into consideration only the networks above the percolation threshold, the fracture length distribution follows a power law with an exponent of −1.9 ± 0.05. Besides the scale differences of the geometric parameters like fracture density and length and the hydraulic parameters like permeability, the connectivity of the networks seems to be a confining characteristic. This is quantitatively described by the percolation parameter and the mean number of intersections per fracture. When assuming a macroscopic hydraulic system at the percolation threshold for the KTB site, the macroscopic mean fracture length can be estimated to approximately 30 m. This stands in agreement with the hydraulic experiments on site. ©2003 Birkhäuser Verlag, Basel,
    Print ISSN: 0033-4553
    Electronic ISSN: 1420-9136
    Topics: Geosciences , Physics
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  • 9
    Publication Date: 2017-11-28
    Description: Author(s): S. A. Chambers, M. H. Engelhard, L. Wang, T. C. Droubay, M. E. Bowden, M. J. Wahila, N. F. Quackenbush, L. F. J. Piper, Tien-Lin Lee, C. J. Nelin, and P. S. Bagus We have measured high-resolution core-level and valence-band x-ray photoemission spectra for single-crystal T i 2 O 3 cleaved anoxically. The Ti(III) spectra for this lattice are considerably more complex than those measured for Ti(IV)-based oxides due to the presence of a single unpaired electron in th... [Phys. Rev. B 96, 205143] Published Mon Nov 27, 2017
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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