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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.
Mit 5 Abbildungen 相似文献
Tectonic, gravimetric, and seismic studies of a depression area of the Bohemian Massif (Lower Austria)
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.
Mit 5 Abbildungen 相似文献
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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. 相似文献
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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.Paper presented at the ESC-Workshop Meeting Seismic Waves in Laterally Inhomogeneous Media, Liblice, 1978. 相似文献
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Ushijima-Mwesigwa Hayato Hyman Jeffrey D. Hagberg Aric Safro Ilya Karra Satish Gable Carl W. Sweeney Matthew R. Srinivasan Gowri 《Mathematical Geosciences》2021,53(8):1699-1724
Mathematical Geosciences - We present a topology-based method for mesh-partitioning in three-dimensional discrete fracture network (DFN) simulations that takes advantage of the intrinsic... 相似文献
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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. 相似文献
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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. 相似文献
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Ushijima-Mwesigwa Hayato Hyman Jeffrey D. Hagberg Aric Safro Ilya Karra Satish Gable Carl W. Sweeney Matthew R. Srinivasan Gowri 《Mathematical Geosciences》2021,53(8):1977-1978
Mathematical Geosciences - The publication of this article unfortunately contained a mistake. The assignment to the affiliations of author Satish Karra was not correct 相似文献
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