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  • 1
    Electronic Resource
    Electronic Resource
    Seismological observations in the eastern Alps
    Amsterdam : Elsevier
    Physics of the Earth and Planetary Interiors 75 (1992), S. 145-152 
    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(92)90125-F
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Tektonische, gravimetrische und seismische Untersuchungen in einem Senkungsgebiet der Böhmischen Masse (Niederösterreich) (1980)
    Springer
    Meteorology and atmospheric physics 29 (1980), S. 167-178 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Description / Table of Contents: Summary Seismic and gravimetric measurements as well as investigations of the orientation of joints were made in the basin of Horn in Lower Austria. In this region, Tertiary sediments overlie mica-schists and phyllites of the Bohemian Massif. The investigations show that the top of the basement can be found with great accuracy by the geophysical methods employed. It is also seen that the joint orientations in the Bohemian Massif correspond to those expectable from the action of the regional “European” neotectonic stress system.
    Notes: Zusammenfassung Im Horner Becken (Niederösterreich) wurden Kluftmessungen, gravimetrische Aufnahmen und seismische Messungen durchgeführt. In dieser Gegend liegen tertiäre Ablagerungen auf Glimmerschiefern und Phylliten der Böhmischen Masse. Die Arbeit zeigt, daß die Anwendung geophysikalischer Methoden die Grenze und den Verlauf des Grundgebirges mit hoher Genauigkeit feststellen läßt. Weiters ist ersichtlich, daß auch in der Böhmischen Masse die Kluftstellungen dem großräumigen neotektonischen Spannungsfeld entsprechen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02247741
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Seismotectonic and refraction seismic investigations in the border region between the Eastern Alps and the Pannonian Basin (1981)
    Springer
    Pure and applied geophysics 119 (1981), S. 1125-1133 
    Details
    ISSN: 1420-9136
    Keywords: Seismicity and crustal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Focal solutions of four strong earthquakes and P signals of twenty-four smaller shocks of the active Mur-Mürz Valley, the Semmering Pass and the Vienna Basin. An ‘equivalent slip rate’ of 0.03 This feature agrees with the model of a subsiding Pannonian Basin. An ‘equivalent slip rate’ of 0.03 cm/year is roughly estimated from earthquake data 1903–1978. This rate does not include the creep rate, but it gives an idea of the magnitude of speed of geological processes in this area. Refraction seismic data from the Alpine Longitudinal Profile 75 shows a low velocity zone in the upper crust of the seismic active East Alpine area but not in the aseismic part of the Pannonian Basin. The eastern margin of the Eastern Alps and the Carpathians limits the Pannonian Basin, which has a special and interesting geological history. Many authors (Szadezky-Kardoss, 1966;Stegena, Ceszy andHorvàth, 1975) presented models of the genesis of the Pannonian Basin. They apply the concept of the ‘mantle diapirs’ to explain the following facts: subsiding of the Pannonian Plate in comparison to the Alps, high terrestrial heat flow within the Pannonian Plate, decrease of the Moho depth from 40 km below the Eastern border of the Alps to 27 km below the Pannonian Basin. They claim that the Alpine-Carpathian interarc and basin represent the final stage of an orogenetic system where ‘subcrustal erosion’ leads to a thinning of the crust. Consequently the surface subsides and is covered by young sediments. They proved that this subsidence and sedimentation is more or less in isostatic equilibrium. The aim of this paper is to provide new arguments using focal solutions and refraction seismic investigations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00876691
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of focal coordinates of near earthquakes in an area of unknown crustal parameters (1977)
    Springer
    Pure and applied geophysics 115 (1977), S. 667-673 
    Details
    ISSN: 1420-9136
    Keywords: Seismology ; Hypocenter determination ; Focal coordinate determination ; Near earthquakes location
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary A new computation method is described which determines the focal coordinates, theP n-andP G-velocity, the focal time and the Moho-depth in the case of near earthquakes. The method is provided especially for areas where the crustal parameters are insufficiently known. It presumes that the standard error ofP n-andP G-arrival times is a minimum. The problem turns out to represent the solution of a set of at least seven equations with seven unknown parameters. Four of these unknowns can be separated in advance. This leads to a considerable simplification. The three remaining unknowns are the focal coordinates. Their best fitting values are found by the gradient method. An example is presented which shows how errors can arise if the initial trial coordinate is chosen at an unfavourable position.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00876131
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Remarks about magnitudes and maximum intensities of the earthquakes in Friuli, 1976 (1976)
    Springer
    Pure and applied geophysics 114 (1976), S. 1105-1108 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The magnitudesM and maximum intensitiesI 0 of 66 earthquakes which occurred in the period from 1901 to 1973 in the eastern alpine area are compared with those of 62 earthquakes occurred in Friuli, northern Italy between 6 May and 15 September 1976. The average focal depth of the Friuli events is about 10 km. The existing empirical relation betweenM andI 0 for this area is improved by many new data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00876204
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Computation of travel times and rays in a medium of two-dimensional velocity distribution (1980)
    Springer
    Pure and applied geophysics 118 (1980), S. 796-806 
    Details
    ISSN: 1420-9136
    Keywords: Ray-tracing computer program ; Seismic travel times, computation of the Alpine Longitudinal Profile
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A ray-tracing computer program is described for a two-dimensional velocity distribution defined by the local wave velocitiesv i, j in points at arbitrary depthv i, j below the surface points with the horizontal coordinatesx i . The velocity variation is assumed to be linear in the triangles formed by three neighbouring points. Travel times and rays are then calculated after the exact analytic formulae for any position of the source within the model. No assumptions other than of a piecewise linear velocity structure are made. A first-order discontinuity can be approximated by a thin layer with a strong velocity gradient and refracted waves or wide-angle reflections obtained in this way. As an example,P-wave rays were computed for section No. 05 of the Alpine Longitudinal Profile. The model includes a low-velocity channel which is cut off on the eastern side, first-order discontinuities and a sediment basin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01593031
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  • 7
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    Structure of the lithosphere in the eastern alps derived from P-residual analysis (1989)
    In:  EPIC3Arbeiten aus der Zentralanstalt für Meteorologie und Geodynamik, Wien, 73, pp. 1-26
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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    PAPER (OA)
  • 8
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    Über die Struktur der Großen Meteor-Bank nach seismischen Ergebnissen (1970)
    Bornträger
    Details
    Publication Date: 2022-07-11
    Description: From reflection and refraction seismic measurements in the area of the Great Meteor-Seamount a crustal section of a part of the Great Meteor-Seamount and the adjoining deep sea area is presented. Two remarkable results can be compared with the crustal structure on the continental margin. Firstly there has been found a very distinct horizon with a p-wave velocity of 5.9-6.0 km/s, which is generally observed for the basement under the continents. This horizon has not been found in the deep sea. Secondly the Mohorovicic discontinuity (p-wave velocity 8.1 km/s) shows a distinct down dip from the deep sea to the centre of the seamount. In its central area the "Moho" has not been observed. From the topography of the "Moho" and the upper horizons the core of the Great Meteor-Seamount is assumed to be a mixture of crustal and mantle material. From the centre of the seamount to the deep sea it changes into material of the "oceanic layer". A comparison of the seismic results with magnetic measurements also points to a continental structure of the Great Meteor-Seamount.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    A multibeam-sonar, magnetic and geochemical flowline survey at 14°14′S on the southern East Pacific Rise: insights into the fourth dimension of ridge crest segmentation (2002)
    Elsevier
    In:  Earth and Planetary Science Letters, 199 (3-4). pp. 359-372.
    Details
    Publication Date: 2016-11-15
    Description: A detailed bathymetric and magnetic survey of the eastern flank of the East Pacific Rise at 14°14′S covering seafloor ages of 0–10 Ma has been carried out and used, along with a flowline profile on the conjugate western ridge flank, to reveal the spreading history and the temporal ridge crest segmentation. Additional information from basaltic lavas is included to study the relationship between physical and magmatic segment boundaries. The sequence of magnetic reversals indicates a total spreading rate of 150 mm/yr since 10 Ma. Symmetric spreading, however, occurred only since 2.8 Ma. Between 7 and 2.8 Ma spreading was asymmetric, with a higher spreading rate toward the east. Migration events of at least five overlapping spreading centres (OSC) left discordant zones on the Nazca plate consisting of hummocky basins and motley texture of curved lineations striking a few degrees oblique to the strike of the ridge crest. Four of the OSCs were right-stepping and migrated northward and one was left-stepping and migrated southward. By transferring Pacific lithosphere to the Nazca plate, these migration events may account for most of the asymmetric accretion observed. The basaltic samples from the eastern flank have been analysed and back tracked to the position of eruption on the ridge crest. In terms of their geochemical signature (Mg# 0.41–0.68) the samples reveal that the magmatic segment boundary between the Garrett transform and 14°30′S has remained stationary over the last 10 Myr and therefore provide no evidence for a link between magmatic and physical segmentation. We therefore propose that migrating non-transform ridge axis discontinuities are governed by propagating giant cracks; as a crack front advances a melt reservoir is tapped and magma rises passively into the crack and erupts subsequently on the seafloor. Some of the OSCs seem to have originated close to transform faults and therefore argue that far-field stresses, perhaps caused by the evolution of the Bauer microplate, rather than mantle upwelling create non-transform ridge axis discontinuities.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0012-821X(02)00595-2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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