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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Studia geophysica et geodaetica 21 (1977), S. 267-273 
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary PKP-amplitudes of about 400 earthquakes from the SW Pacific Ocean observed at three stations in Central Europe were used to obtain the calibration function qPKP(D, h) based on the NEIS mb magnitudes. The calibration function allows us to determine the magnitudes for week earthquakes from the Pacific, for which the magnitudes from the P-waves cannot be derived.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Studia geophysica et geodaetica 25 (1981), S. 288-292 
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary A new approximation of the velocity-depth distribution in radially symmetric media is suggested. This approximation guarantees the continuity of velocity and its first and second derivatives, and does not generate false low-velocity layers. It removes false anomalies from the amplitude-distance curve and considerably increases its stability. The evaluation of ray integrals and ray amplitudes using this velocity-depth approximation does not require the computation of any transcendental function and is, therefore, very fast. Numerical examples are presented.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Studia geophysica et geodaetica 23 (1979), S. 144-149 
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The average dependence of the calibration function q and the travel-time residuals Δt on the depth and distance of the source has been derived for individual branches of PKP waves using earthquakes from the SW Pacific Ocean (distance interval 147°–159°, depths 0–700 km). The analysis of very distant shocks of all depths according to the regional PKP travel time tables can be completed by the magnitude determination.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Studia geophysica et geodaetica 27 (1983), S. 233-240 
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Резюме Выве¶rt;ены формулы ¶rt;ля рaсчеma чaсmных nроuзво¶rt;ных о¶rt;о рaфов оmрaженных u рефрaн uровaнных волн в слоuсmоŭ сре¶rt;е с nосmояннымu рa¶rt;uенmaмu скоросmu. Прuве¶rt;ены чuсленные nрuмеры.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Studia geophysica et geodaetica 29 (1985), S. 49-67 
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Description / Table of Contents: Summary A procedure of fast computation of body-wave ray synthetic seismograms in vertically inhomogeneous media is suggested. The procedure uses a special approximation of the velocitydepth distribution which guarantees continuity of the first and second derivatives of velocity and does not generate false low-velocity layers (oscillations in the velocity-depth function). The ZESY82 program package, which is based on the suggested procedure, is described. The point source with an arbitrary radiation pattern may be situated at any points of the model, the receivers are situated regularly or irregularly along any profile on the Earth's surface, containing the epicentre. Numerical examples of the synthetic record sections for a model of the Earth's crust and the uppermost mantle are given.
    Notes: Резюме Пре¶rt;лaгaеmся меmо¶rt; бысmрого рaсчеma сuнmеmuческuх лучевых сеŭсмогрaмм объгемных волн в верmuкaльно нео¶rt;норо¶rt;ноŭ сре¶rt;е, uсхо¶rt;я uз сnецuaльноŭ annроксuмaцuu скоросmного рaзрезa, коmорaя обесnечuвaеm неnрерывносmь скоросmu u еге nервоŭ u вmороŭ nроuзво¶rt;ных u не nрuво¶rt;um к обрaзовaнuю uскуссmвенных слоев nонuженноŭ скоросmu. Крamко оnuсaн aлгорumмгруnы nрогрaмм ZESY82, основaнноŭ нa эmом меmо¶rt;е. Точечныŭ uсmочнuк с любоŭ хaрaкmерuсmuкоŭ uзлученuя рaсnоложен в любоŭ mочке мо¶rt;елu; nрuгемнuкu ¶rt;олжны быmь рaсnре¶rt;елены в¶rt;оль nрофuля, со¶rt;ержaщего эnuценmр. Прuве¶rt;ен nрuмер сuнmеmuческuх сеŭсмогрaмм ¶rt;ля о¶rt;ноŭ мо¶rt;елu земноŭ коры u верхнеŭ мaмmuu.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Studia geophysica et geodaetica 21 (1977), S. 127-136 
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary This paper shows some examples of theoretical seismograms of short period PKP waves calculated by the zero approximation of the ray theory. The influence of the epicentral distance, source time function and the Earth's crust on the form of the seismograms is shown.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Studia geophysica et geodaetica 44 (2000), S. 158-174 
    ISSN: 1573-1626
    Keywords: West Bohemia ; earthquake swarms ; location ; grid search ; homogeneous velocity models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Abstract West Bohemian earthquake swarms are used to determine the parameters of simple homogeneous velocity models of the individual subregions of the given area, based on a group of earthquakes that occurred in these subregions. The grid search method is used for location. Models yielding the minimum sum of squares of the travel-time residua in locating the whole group of earthquakes in the given subregion are considered suitable. Relocation obtained by grid search is compared with that obtained by the FASTHYPO method. The computations indicate that the subregions under consideration can be, from the point of view of earthquake location, sufficiently represented by homogeneous models, but the models differ for the data from different subregions. The velocities of these models are given. The models under consideration are compared with some of the previously published 1-D models of the broader region of Western Bohemia.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of seismology 3 (1999), S. 375-391 
    ISSN: 1573-157X
    Keywords: Fresnel volumes ; IASP91 model ; PKP waves ; resolution ; seismic tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Fresnel volumes provide a suitable tool for estimating the resolution limits or accuracy of tomographic methods based only on the arrival times of these seismic waves, which penetrate the deep interior of the Earth. The standard definition of the Fresnel volume was modified to include effects of multipathing, i.e., multivalued travel times. Computations were performed in the IASP91 model for three representative epicentral distances and two prevailing signal periods. Preliminary results have been obtained. They place a rather strong restriction on the resolution limits of tomographic methods, depending on the prevailing period, due to the relatively large fatness of PKP Fresnel volumes.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Studia geophysica et geodaetica 22 (1978), S. 303-309 
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary This paper gives some examples of theoretical seismograms of PKP waves near the caustic. Seismograms of refracted waves for the original medium are compared with seismograms composed as a sum of the reflected waves, generated at boundaries of a substitute medium. All seismograms are calculated by zero approximation of the ray theory. The influence of some parameters of the source function and of the substitute medium on the results is shown.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Studia geophysica et geodaetica 23 (1979), S. 138-143 
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The amplitude-distance function of the short period PKP waves, recorded at Macedonian seismological stations from sources in the SW Pacific Ocean, is investigated. The dependences found for sources with depths under 100 km and for sources with depths over 500 km are compared with the results of some other authors.
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