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  • 1
    Electronic Resource
    Electronic Resource
    The Preparation and Properties of a Series of Alkyl Thiolacetates1 (1937)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 59 (1937), S. 1089-1090 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01285a037
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  • 2
    Electronic Resource
    Electronic Resource
    Some Monothioformals (1937)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 59 (1937), S. 1090-1091 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01285a038
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  • 3
    Electronic Resource
    Electronic Resource
    Scales of Heterogeneities in the Continental Crust and Upper Mantle (1999)
    Springer
    Pure and applied geophysics 156 (1999), S. 29-52 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Inhomogeneous media, scattering, lower crust, upper mantle, transition zone.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —A seismological characterization of crust and upper mantle can refer to large-scale averages of seismic velocities or to fluctuations of elastic parameters. Large is understood here relative to the wavelength used to probe the earth.¶In this paper we try to characterize crust and upper mantle by the fluctuations in media properties rather than by their average velocities. As such it becomes evident that different scales of heterogeneities prevail in different layers of crust and mantle. Although we cannot provide final models and an explanation of why these different scales exist, we believe that scales of inhomogeneities carry significant information regarding the tectonic processes that have affected the lower crust, the lithospheric and the sublithospheric upper mantle.¶We focus on four different types of small-scale inhomogeneities (1) the characteristics of the lower crust, (2) velocity fluctuations in the uppermost mantle, (3) scattering in the lowermost lithosphere and on (4) heterogeneities in the mantle transition zone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050288
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  • 4
    Electronic Resource
    Electronic Resource
    Realistic Models of Anisotropic Laminated Lower Crust (1999)
    Springer
    Pure and applied geophysics 156 (1999), S. 139-155 
    Details
    ISSN: 1420-9136
    Keywords: Key Words: Anisotropy, reflectivity.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —The genesis of the laminated lower crust has been attributed to extensional processes leading to structural and textural ordering. This implies that the lower crust might be anisotropic. Laboratory measurements of lower crustal rock samples and xenolithes show evidence of anisotropy in these rocks due to oriented structure.¶In this paper we investigate the seismic shear-wave response of realistic anisotropic lower crustal models using the anisotropic reflectivity method. Our models are based on representative petrophysical data obtained from exposed lower crustal sections in Calabria (South Italy), Val Strona and Val Sesia (Ivrea Zone, Northern Italy). The models consist of stacks of anisotropic layers characterized by quantified elastic tensors derived from representative rock samples which provide alternating high and low velocity layers.¶The seismic signature of the data is comparable to seismic observations of in situ lower crust. For the models based on the Calabria and Val Strona sequences shear-wave splitting occurs for the Moho reflection at offsets beyond 70 km with travel-time delays up to 300 and 500 ms, respectively. The leading shear wave is predominantly horizontally polarized and followed by a predominantly vertically polarized shear wave. Contrastingly, the Val Sesia model shows no clear evidence of birefringence. Isotropic versus anisotropic modelling demonstrates that the shear-wave splitting is clearly related to the intrinsic anisotropy of the lower crustal rocks for the Val Strona sequence. No evidence of birefringence caused by thin layering is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050293
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  • 5
    Electronic Resource
    Electronic Resource
    Architecture of the micropylar apparatus in Bradysia tritici (syn. sciara ocellaris)
    Amsterdam : Elsevier
    Cell Differentiation and Development 27 (1989), S. 139 
    Details
    ISSN: 0922-3371
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0922-3371(89)90430-9
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  • 6
    Electronic Resource
    Electronic Resource
    Wave propagation in laterally heterogeneous layered media (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: This paper derives a solution of the seismic response of an acoustic medium with 2-D geometry using Kirchhoffs representation of the wavefield. The medium can be composed of several layers, separated by curved interfaces.The difference between the approach presented here and other Kirchhoff-type solutions of the multilayer case is that we take care of all diffractive effects during wave propagation, including those during transmission from source to reflector and from reflector to receiver.A crucial point in this method is the replacement of the Kirchhoff-Helmholtz formula, that requires both the knowledge of the wavefield and its directional derivative at the medium's interfaces, by the Rayleigh-Sommerfeld representation where only the wavefield must be known or approximated. The propagation of acoustic or elastic waves through a stack of layers with curved interfaces can then be described by a sequence of plane-wave compositions or plane-wave decompositions. This point of view implies a reinterpretation of Kirchhoff's formula, in terms of plane waves emanating from a reflector, excited by an incident wavefield.The outlined theory provides a convenient formulation for the transmission and reflection of waves in a multilayered laterally inhomogeneous medium with good accuracy as long as the radius of curvature of the boundaries clearly exceeds the dominant wavelength and if the distance between interfaces is larger than a few wavelengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1990.tb05679.x
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  • 7
    Electronic Resource
    Electronic Resource
    A deep reflection seismic line across the Northern Rhine Graben
    Amsterdam : Elsevier
    Earth and Planetary Science Letters 104 (1991), S. 140-150 
    Details
    ISSN: 0012-821X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0012-821X(91)90200-2
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  • 8
    Electronic Resource
    Electronic Resource
    Wave propagation in a multiple-scattering upper mantle—observations and modelling (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 127 (1996), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A striking feature of Russian long-range seismic refraction data from Peaceful Nuclear Explosions is the observation of a high-frequency teleseismic Pn, phase, which travels with a group velocity of 8.0 km s-1 out to distances of several thousands of kilometres. Modelling using the reflectivity method shows that this phase can be understood as the response of an upper mantle that contains random RMS velocity fluctuations of about ±4 per cent superimposed on a positive velocity gradient. This class of model explains the existence of the teleseismic Pn, its high-frequency content and its coda length. A teleseismic Pn can only be generated if velocity flucluations are strong enough to cause multiple scattering and occur on a subwavelength scale. Cross-correlation properties of P- and S-wave velocity fluctuations exert a substantial influence on the wavefield. A completely unexpected phase can be observed if the fluctuations are imposed on a negative gradient
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1996.tb04735.x
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  • 9
    Electronic Resource
    Electronic Resource
    P-wave mantle velocity structure beneath northern Eurasia from long-range recordings along the profile Quartz
    Amsterdam : Elsevier
    Physics of the Earth and Planetary Interiors 79 (1993), S. 269-286 
    Details
    ISSN: 0031-9201
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9201(93)90151-X
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  • 10
    Electronic Resource
    Electronic Resource
    Seismic mapping of crustal structures beneath the Indus-Yarlung Suture, Tibet (1997)
    Oxford, UK : Blackwell Science Ltd
    Terra nova 9 (1997), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Records of densely spaced shots along the Sino-US reflection line INDEPTH II at offsets between 70 and 130 km parallel to the main profile provide an image of the crust straddling the Indus-Yarlung suture. The major features are prominent reflections at about 20 km depth beneath and extending out to about 20–30 km north and south of the surface exposure of the suture, and north-dipping reflectors north of the suture. Various interpretations for the reflections are possible. (i) They represent a decollement, possibly of the Gangdise thrust system. In this scenario, the surface expression of the Gangdise thrust as mapped in eastern south Tibet is a splay with the decollement continuing southwards and either ending as a blind thrust or ramping up as one of the thrusts within the northernmost Tethyan shelf sequence. (ii) The reflections represent fabrics within gneisses, partly obliterated by intrusions reaching various levels of the crust. The reflection bands may be interpreted in terms of deformation or sedimentary structures belonging to the Indian crust, the accretionary complex, and the basement of the Gangdise belt. The intrusions could be related to the Tethyan leucogranites south of the suture (Rinbung leucogranite), and to the Gangdise magmatic arc to the north of the suture. (iii) The reflections represent a fortuitous coincidence of different features north and south of the suture. South of the suture, the reflections may record the basement–cover interface of the Indian crust or a thrust system in the Tethyan shelf. North of the suture, they may comprise different levels within the Gangdise belt and its basement. Although it is not possible to discriminate between the suggested scenarios without additional information, the seismic mapping points to the importance of post-collisional (Oligocene–Miocene) tectonics, which reshaped the suture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3121.1997.d01-7.x
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