Velocity of longitudinal waves in eclogite and ultrabasic rocks under pressures to 4 kilobars     

E. I. Bajuk  M. P. Volarovich  Karel Klíma  Zdeněk Pros  Jiří Vaněk 《Studia Geophysica et Geodaetica》1967,11(3):271-280

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Radio Emission from Three-dimensional Relativistic Hydrodynamic Jets: Observational Evidence of Jet Stratification     

Aloy MA  Gómez JL  Ibáñez JM  Martí JM  Müller E 《The Astrophysical journal》2000,536(2):L85-L88

High-resolution, high signal-to-noise ratio, blue-violet spectra of three red giant branch tip stars in M15 have been obtained with the Keck I High-Resolution Echelle Spectrograph. These spectra have been analyzed to determine the abundances of several neutron-capture elements, including the radioactive chronometer element thorium. There are two principal results of this study. First, the abundances of the heavier (Z>/=56) elements for each of the three stars is well matched by a scaled solar system r-process abundance distribution. Second, a weighted mean-observed Th/Eu ratio for the stars implies an age for the neutron-capture material in M15 stars of 14+/-3 Gyr, in reasonable agreement with other recent age estimates for Galactic globular clusters.  相似文献   

The effect of the irregularities of the shape of the Earth's core-mantle boundary on the observed acceleration of gravity     

Jiří Trešl  Reviewer M. Pick 《Studia Geophysica et Geodaetica》1981,25(1):5-13

Summary The disturbing gravitational effect of the irregularities of the shape of the coremantle boundary are studied at a point on the Earth's surface. The effect is computed for models of local and zonal distribution of the disturbing masses under the assumption that the total mass of the Earth remains constant. Formulae giving the disturbing gravitational effect as a function of the distribution of the disturbing masses and of the position of the point of observation on the Earth's surface are derived for the individual models. Numerical values of the disturbances have been calculate in all cases.  相似文献   

Geodynamic interpretation of the earthquake distribution in the kermadec subduction zone     

Václav Hanuš  Jiří Vaněk  Reviewer A. Zátopek 《Studia Geophysica et Geodaetica》1978,22(3):259-275

Summary The morphology of the Wadati-Benioff zone in the Kermadec region, based on the distribution of 1100 earthquake foci, verified the existence of an intermediate aseismic gap and its relation to active andesitic volcanism, and the non-uniformity of subduction due to the hampering effect of the main structural features of the subducting Pacific plate. Two cycles of the recently active subduction in the Tonga-Kermadec island arc were found.  相似文献   

Elastic properties of eclogite rocks from the Bohemian massif   总被引：1，自引：0，他引：1  

Vladislav Babuška  Jiří Fiala  D. J. Mayson  R. C. Liebermann  Reviewer J. Buben 《Studia Geophysica et Geodaetica》1978,22(4):348-361

Summary Compressional velocity anistropy has been studied in detail at atmospheric pressure for 78 specimens of 23 types of eclogite rocks from the Bohemian massif. For nine of these rock types, compressional and shear velocities were measured as a function of pressure to750 MPa at room temperature. The velocity anisotropy for both compressional and shear waves is less than4% at high pressure. The velocities increase with increasing garnet content and decrease with increasing symplectitization. The Moldanubian eclogites have significantly higher velocities, on the average, than the eclogites from the Kruné hory crystalline complex, although the densities of both groups are comparable.  相似文献   

Morphology of the Wadati-Benioff zone,andesitic volcanism,and active fracture zones in Central America     

Visiting professors Václav Hanuš  Jiří Vaněk  Reviewer M. Krs 《Studia Geophysica et Geodaetica》1979,23(3):218-234

Summary The morphology of the Wadati-Benioff zone in the region of Central America, based on the distribution of 1377 earthquake foci, verified the existence of an intermediate aseismic gap and its relation to active andesitic volcanism, and the non-uniformity of subduction due to the hampering effect of the main structural features of the subducting Cocos plate. Four deep seismically active fracture zones, genetically connected with the process of subduction, and three fracture zones manifesting the possible boundary between the Americas and Caribbean plates were identified in the continental wedge.  相似文献   

On the universal character of particle transfer in a field of turbulence     

Jiří Horák  Reviewer J. Navrátil 《Studia Geophysica et Geodaetica》1980,24(1):88-91

Summary With the aid of elementary methods of the theory of dimensionality we approach the problem of existence of invariants in the process of mixing particles of a passive admixture in a field of turbulence.  相似文献   

Amplitude curves of seismic body waves at distances smaller than 12°     

Jiří Vaněk  Cornelius Radu 《Studia Geophysica et Geodaetica》1964,8(4):319-325

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Schwankungen der Niederschläge in der Elfjährigen Sonnenflecken Periode     

Jiří Bouška 《Studia Geophysica et Geodaetica》1964,8(4):412-415

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On the geometric origin of the spectral formulation of the self-preservation hypothesis in the theory of turbulence     

Jiří Horák  Reviewer J. Navrátil 《Studia Geophysica et Geodaetica》1981,25(4):404-410

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