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  • Articles  (39)
  • 2005-2009  (2)
  • 1980-1984  (22)
  • 1970-1974  (15)
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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
    ДИНАМИЧЕСКИЕ ПАРАМЕТРЫ СИЛЬНЫШ ЗЕМЛЕТРЯСЕНИЙ ПО ДАННЫМ ШИРОКОПОЛОСНОЙ ДЛИННОПЕРИОДНОЙ АППАРАТУРЫ (1980)
    Springer
    Studia geophysica et geodaetica 24 (1980), S. 142-152 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The dynamic focal parameters of a series of strong earthquakes, recorded by the FBV broadband velocigraph at KHC (Kašperské Hory, Czechoslovakia), are estimated. The influence of specific wave pattern features on the estimation accuracy is studied. Polarization analysis is used to demonstrate the complicated interference character even of record portions corresponding to a single teleseismic wave group. The values of the dynamic focal parameters do not depend significantly on the length of the analysed record portions and are sufficiently consistent with those reported by Riznichenko [2]. The possibility of estimating dynamic focal parameters from recording of standard classes B (intermediate band) and C (long-period) seismographs is pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01634408
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  • 6
    Electronic Resource
    Electronic Resource
    Laboratory investigations on fault plane induced tensile cracks (1981)
    Springer
    Studia geophysica et geodaetica 25 (1981), S. 332-342 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary Tensile cracks induced by stress concentration around a fault plane in physical models under uniaxial load were analyzed. The results characterizing the decisive role of the fault plane inclination to the the stress direction are presented. Two stages of tensile crack life were determined, i.e. the first, seismoactive stage, accompanied by seismic energy release and the second aseismic one characterized by low velocity of crack propagation. Results obtained seem to be relevant to a better understanding of the character and regime of actual seismoactive faults.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01629218
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  • 7
    Electronic Resource
    Electronic Resource
    An analytical migration method for crustal wide angle reflections (1982)
    Springer
    Studia geophysica et geodaetica 26 (1982), S. 254-271 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary An analytical migration method is developed for inverting wide angle seismic reflection travel time data with proper migration. In this method the concept of effective velocity (V eff ) in the vertically inhomogeneous earth has been used, which takes into account the refraction effect. It is shown that the migration process in this case becomes extremely rapid as curved ray paths are replaced by equivalent straight paths. A post migration ‘sliding correction’ is found to be necessary, which arises due to the non-collinearity of the recording point, reflection point and the image point in the equivalent straight path geometry for dipping reflectors. Calculations for some representative dips show that, for the depths and recording ranges of interest in DSS, the vertical component of the sliding correction is negligible compared to the horizontal component. However, even the horizontal component is not significant for reflectors with gentle dips. The effect of certain simplifying assumptions in the estimation of V eff is shown to be within the error limits of velocity determination. A computer programme package has been written for carrying out the migration. The method yields more accurate results in various theoretical and field cases than the conventional graphical wave front methods which are at present widely used for crustal reflection work.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01635034
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  • 8
    Electronic Resource
    Electronic Resource
    Source parameters for stick-slip and tensile-crack mechanisms and possibilities of their seismic discrimination (1983)
    Springer
    Studia geophysica et geodaetica 27 (1983), S. 143-156 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Резюме Оmрывнaя mрещuнa uнuцuровaннaя рaзломом u сеŭсмоaкmuвныŭ с¶rt;вuг nо рaзлому былu uзучены в фuзuческuх мо¶rt;елях. Комбuнaцuеŭ мо¶rt;ельных эксnерuменmов u mеорuu былu оnре¶rt;елены очaговые naрaмеmры, сеŭсмuческuŭ моменm u сняmое нanряженuе ¶rt;ля мехaнuзмов оmрывноŭ mрещuны u сеŭсмоaкmuвного с¶rt;вuгa. Полученные резульmamы nокaзывaюm невыго¶rt;носmь эmuх очaговых naрaмеmров, обыкновенно оnре¶rt;еляемых нa сеŭсмологuческоŭ nрaкmuке, кaк крumерuŭ ¶rt;ля оmлuченuя рaссмamрuвaемых мехaнuзмов, u укaзывaюm неnрaвuльное оnре¶rt;еленuе эmuх naрaмеmров ¶rt;ля очaгов с комбuнuровaнным мехaнuзмом оmрывa u с¶rt;вuгa. Для рaссмamрuвaемых uсmочнuков былu вычuслены знaкu u aмnлumу¶rt;ы nервых всmуnленuŭ сеŭсмuческuх волн u былa nокaзaнa uх лучшaя nрuменumельносmь ¶rt;ля оmлuченuя с¶rt;вuговых u оmрывных мехaнuзмов нa основе сmaн¶rt;aрmноŭ сеŭсмологuческоŭ uнmерnреmaцuu.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01588987
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Tensional crack development in physical models with inhomogeneities under load (1980)
    Springer
    Studia geophysica et geodaetica 24 (1980), S. 373-381 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The paper deals with a study of the mean stress field (σM) and its gradient (δσM/δx) in uniaxially loaded two-dimensional models of small thickness with respect to other dimensions, in which two inhomogeneities, e.g., a circular opening and a linear slit have been made. Particular attention was paid to the stress field development in the treated models durin gthe change of the mutual geometric configuration of both the inhomogeneities in question. The problem was analysed theoretically by means of Muskhelishvili's potentials of the two-dimensional theory of elasticity. To compare the results of calculations, the schlieren method was used to visualize and record the studied gradients of stress fields in physical models. The results of the calculations were calibrated by laboratory tests. In this way the individual model situations were classified from the point of view of their resistance to the applied load.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01629396
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