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  • Articles  (24)
  • Springer  (24)
  • 1985-1989  (10)
  • 1970-1974  (14)
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  • Articles  (24)
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  • 1
    Electronic Resource
    Electronic Resource
    Refraction of elastic waves into a medium of lower velocity — Pseudospherical waves (1971)
    Springer
    Pure and applied geophysics 92 (1971), S. 115-132 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary An irregular wave group (here called pseudospherical), the existence of which is connected with the velocity boundary at which the velocity decreases discontinuously, is investigated. A schlieren modelling device was chosen for a model investigation of this wave since it permits the investigation of wave fields inside the measured models. The model consisted of two layers of transparent gels, the source lay in the layer of higher velocity. The measurements have shown that an irregular wave in the layer of lower velocity exists only in a certain region along the boundary; its wave front has a spherical form and its intensity decreases rapidly with increasing distance of the source from the boundary. The wave always comes only after the regular refracted wave which conforms with the ray theory. These properties correspond to the properties of a wave first described byOtt [1]3) andBrekhovskikh [2]. In the conclusion of the present paper the possibilities of recording pseudospherical waves in seismology are outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00874996
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  • 2
    Electronic Resource
    Electronic Resource
    Frequency content of stress waves in the nearest zone of a spherical explosive source in gravel sandy soil (1971)
    Springer
    Studia geophysica et geodaetica 15 (1971), S. 421-423 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Zusammenfassung Bei Verfolgung der Entstehung und Formierung der durch eine explosive Kugelquelle erregten Druckwellen steht die Frage ihres Frequenzgehalts im Vordergrund. Der Frequenzgehalt dieser Wellen wurde durch die Abhängigkeit ausgedrückt (2), die die Änderungen der relativen Breite des Amplitudenspektrums (1) vom Gewicht und von der Entfernung der Quelle angibt. Aus(2) erfolgt, dass der Frequenzgehalt der Druckwellen mit wachsender Entfernung und Grösse der Ladung exponential sinkt, wobei die Steilheit dieses Abfalls für höhere Grössen der Ladung kleiner ist. Das Herabsetzen des Frequenzgehalts dieser Wellen verursacht, dass die maximate spektral Dichte in grösseren Entfernungen von der Quelle markanter wird.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01589261
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  • 3
    Electronic Resource
    Electronic Resource
    The computation of the elastic constants of an anisotropic medium from the velocities of body waves (1973)
    Springer
    Studia geophysica et geodaetica 17 (1973), S. 115-122 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Резюме Иссле¶rt;уеmся оnре¶rt;еленuе уnру uх nосmоянных nо скоросmям объемных волн. Меmо¶rt;ом nосле¶rt;овamельных nрuблuженuŭ решaеmся сuсmемa урaвненuŭ muna (6) u (10). Для мamерuaлов с высокоŭ aнuзоmроnuеŭ вмесmо скоросmеŭ nоnеречных волн можно uсnользовamь uх оценкu, коmорые nовmоренuем рaсчеma уmочняюmся (фu . 2). Для вычuсленuя уnру uх nосmоянных необхо¶rt;uмо знamь скоросmu nро¶rt;ольных волн мuнuмaльно в 15mu нanрaвленuях u скоросmu обеuх nоnеречных волн мuнuмaльно в шесmu нanрaвленuях. Прu uсnользовaнuu оценок скоросmеŭ nоnеречных волн необхо¶rt;uмо знamь скоросmu nро¶rt;ольных волн мuнuмaльно ¶rt;ля 21 о нanрaвленuя.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01613681
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  • 4
    Electronic Resource
    Electronic Resource
    The elastic constants of crystalline limestone computed from the velocities of body waves (1973)
    Springer
    Studia geophysica et geodaetica 17 (1973), S. 255-260 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Резюме Меmо¶rt; вычuсленuя уnру uх nосmоянных uз скоросmеŭ nро¶rt;олЩных волн, оnuсaнныŭ в[4], был uсnолЩовaн ¶rt;ля обрaзцa uзвесmнякa с небольщuм коэффцuенmом aнuзоmроnuu. Для maко о мamерuaлa возможно нaŭmu ря¶rt; совокуnносmеŭ уnру uх nосmоянных, коmорые хорощо annроксuмuруюm кuнемamuческuе u ¶rt;uнaмuческuе своŭсmвa nро¶rt;олъных волн. Девяmъ uз эmuх nосmоянных uмеюm о¶rt;нознaчные, nрaвuльные знaченuя. Для осmaльных ¶rt;венa¶rt;цamu nосmоянных мозно uз скоросmеŭ nро¶rt;ольных волн оnре¶rt;елumь mолько щесmъ условных урaвненuŭ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01626589
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  • 5
    Electronic Resource
    Electronic Resource
    Kinematics of refracted and reflected waves in inhomogeneous media with non-planar interfaces (1972)
    Springer
    Studia geophysica et geodaetica 16 (1972), S. 126-152 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Zusammenfassung Es werden die Grundbeziehungen für die Berechnung von Strahlen seismischer Wellen in inhomogenen Milieus abgeleitet, in denen die Geschwindigkeit allgemein von drei krummlinigen Koordinaten abhängt. Die angeführten Beziehungen stellen ein System von gewöhnlichen Differentialgleichungen erster Ordnung dar. Die numerische Lösung dieses Systems bietet eine Möglichkeit, die Strahlendiagramme, Laufzeitkurven und Isochronen für die gegebenen Geschwindigkeitsmodelle zu konstruieren. Aufmerksamkeit wird ebenfalls dem Einfall der Strahlen auf eine unebene Grenzschicht gewidmet. Die Beziehungen für die Berechnung reflektierter und refraktierter Strahlen werden abgeleitet. Anhand der abgeleiteten Beziehungen werden Strahlendiagramme und Laufzeitkurven für eine Geschwindigkeitsverteilung berechnet, die durch die vorläufige Interpretation der Ergebnisse von seismischen Tiefensondierungen am tschechoslowakischen Teil des Profils VI gewonnen wurden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01614511
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  • 6
    Electronic Resource
    Electronic Resource
    Relation between the field of surface heat flow and the distribution ofP n -wave velocities for continents (1988)
    Springer
    Studia geophysica et geodaetica 32 (1988), S. 287-299 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Description / Table of Contents: Summary The dependence between Pn-wave velocities and the surface heat flow, temperature at the core-mantl boundary and thickness of the Earth's crust for continents (Europe, Asia, North America and Australia) was investigated statistically in connection with the problem of lateral inhomogeneities in the upper mantle. The relations obtained were compared with those determined under laboratory conditions. The conclusion is that temperature and pressure effects may provide additional explanations of the regional variations of Pn-wave velocities observed in most continents.
    Notes: Резюме Зaвuсuмосmь меж¶rt;угрaнuчнымu скоросmямu nро¶rt;ольных волн нa nоверхносmu Мохоровuчuчa(Pn ), nоверхносmным mеnловым nоmоком, mемnерamуроŭ нa Мохо u мощносmью земноŭ коры конmuненmов былa uссле¶rt;овaнa в связu с воnросом о нрuчuнегорuзонmaльных нео¶rt;норо¶rt;носmеŭ скоросmu Pn. Оnублuковaнные ¶rt;aнные о резульmamaх лaборamорных uссле¶rt;овaнuŭ уnругuх своŭсmв nоро¶rt; верхнеŭ мaнmuu в условuях высокuх ¶rt;aвленuŭ u mемnерamур нaхо¶rt;umся в сооmвеmсmвuu с резульmamaмu nре¶rt;лaгaемоŭ рaбоmы. Делaеmся выво¶rt;, чmо регuонaльные uзмененuя скоросmеŭ Pn-волн ¶rt;ля больщеŭ чaсmu конmuненmaльноŭ коры оnре¶rt;еляюmся рaзлuчuем mермо¶rt;uнaмuческuх условuŭ нa nоверхносmu Мохоmовuчuчa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01637886
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  • 7
    Electronic Resource
    Electronic Resource
    Modellseismische Untersuchungen an 2- und 3-dimensionalen Testmodellen, Teil 1 (1971)
    Springer
    Studia geophysica et geodaetica 15 (1971), S. 147-160 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary Following the recommendation of the European Seismological Commission (Copenhagen 1966) to carry out comparative measurements on simple seismic models with a prescribed velocity-depth distribution (test models), an attempt was made to compare results obtained with different model techniques. In the present paper, model investigations with the first two proposed test models carried out by 2- and 3-dimensional model techniques are described. Seismogrammes, travel-time curves and amplitude-distance curves of the models investigated are given. A quantitative comparison of the results shows a satisfactory agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01623912
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  • 8
    Electronic Resource
    Electronic Resource
    Colour schlieren representation of compressional-stress fields with respect to focal zone study (1973)
    Springer
    Studia geophysica et geodaetica 17 (1973), S. 314-320 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary A method of colour schlieren recording of the compressional-stress field gradients, suitable for focal zone study on models, is suggested. The study presents colour schlieren records of the compressional-stress fields in loaded square plates, containing inhomogeneities which give instant quantitative information on these fields. If the inhomogeneity is shaped like Griffith's diagonal slit, good agreement is demonstrated between the experiment and the theoretical calculation of the compressional-stress field in a model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01576722
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  • 9
    Electronic Resource
    Electronic Resource
    Approximative ray tracing and the accuracy of earthquake localization in media approximated by block structures (1989)
    Springer
    Studia geophysica et geodaetica 33 (1989), S. 164-176 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Description / Table of Contents: Summary Localization errors made by approximating a given medium by a homogeneous rectangular block model and due to the approximative solution of two-point ray tracing are estimated for four different structures. The separate influence of the individual characteristics of the medium is discussed. The iterative Geiger method supplemented by a generalized inversion of the damped least-squares and Marquardt algorithm is used for localizating five hypothetical hypocentres using 9 stations. Travel times in the original structures, used as input data for localization, are calculated using a special ray tracing system.
    Notes: Резюме В рaбоmе оценены ошuбкu локaлuзaцuu вызвaнные annроксuмaцuеŭ реaльноŭ сре¶rt;ы мо¶rt;елеŭ сосmaвленноŭ uз орmогонaлных о¶rt;норо¶rt;ных блоков u annроксuмaцuеŭ mочного лучa ¶rt;вумя munaмu nрuблuзumельных лучеŭ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01646582
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  • 10
    Electronic Resource
    Electronic Resource
    Computation of synthetic seismograms in 2-D and 3-D media using the Gaussian beam method (1989)
    Springer
    Studia geophysica et geodaetica 33 (1989), S. 213-229 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Description / Table of Contents: Summary The Gaussian beam method is applied to vertical seismic profiling in 2-D and 3-D models. A simple approach to the computation of Gaussian beam seismograms in the vicinity of structural interfaces is proposed. The effects of (a) the radiation pattern of a point source, (b) noncausal attenuation, (c) transverse inhomogeneities in synthetic seismograms are studied on numerical examples.
    Notes: Резюме Меmо¶rt; Гaуссевых nучков uсnользуеmся ¶rt;ля верmuкaльно о сеŭсмuческо о nрофuлuровaнuя в ¶rt;вух u mрехмерных мо¶rt;елях сре¶rt;ы. Уnоmребляеmся несложныŭ nо¶rt;хо¶rt; к рaсчеmу сеŭсмо рaмм в окресmносmu сmрукmурно о рaз¶rt;елa. Нa nрuмерaх сuнmеmuческuх сеŭсмо рaмм uзучaюmся эффекmы (a) uзлученuя mочечно о uсmочнuкa, (б) неnрuчнно о nо лощенuя u (в) nоnеречных нео¶rt;норо¶rt;носmеŭ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01633525
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