Seismically active fracture zones and distribution of thermal springs in Ecuador     

Václav Hanuš  Jiří Vaněk  Gaston Sandoval  Reviewer J. Zahradník 《Studia Geophysica et Geodaetica》1987,31(3):258-265

Summary The analysis of the geometry of distribution of earthquake foci occurring in the continental South American plate above the subducted Nazca plate reveals that in the region of Ecuador these earthquakes accumulate in 8 well-separated fracture zones. These zones are interpreted as a system of deep seismically active fractures induced in the continental plate by the process of subduction. It is shown that the position of known thermal springs and of observed hydrothermal alterations in Ecuador correlates with the outcrops of the fracture zones.

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Deep structure of the bohemian massif from phase velocities of Rayleigh and Love waves     

Erhard Wielandt  Andreas Sigg  Axel Plešinger  Josef Horálek  Reviewer K. Pěč 《Studia Geophysica et Geodaetica》1987,31(1):1-7

Summary Phase velocities of Rayleigh and Love waves have been measured between the broadband seismic stations KHC (Kaperské Hory, South Bohemia) and KSP (Ksi, Lower Silesia), a profile that nearly coincides with the Interactional DSS Profile VII. The data for both wave types were separately inverted into models of shear-wave velocity versus depth. Novotný's model KHKS 82[1] for the DSS Profile VII was used as a start model. While the crustal section of Novotný's model is compatible with both of our data sets, our Rayleigh-wave data require smaller shear-wave velocities, on the average by 0.24 km/s, in the top 180 km of the mantle. The average difference between Novotný's model and our Love-wave model in that depth range is only 0.06 km/s. If our identification of the observed Love waves as the fundamental mode is correct, this result indicates the presence of polarization anisotropy in the uppermost mantle.

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On global short-periodic synchronous oscillations of the atmosphere     

Vojtěch Vítek  Reviewer J. Bednář 《Studia Geophysica et Geodaetica》1987,31(3):324-326

Summary The existence of global synchronous atmospheric oscillations with the period of about 1.4 hour is indicated in terms of a simple theoretical model of the circumpolar circulation.

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u nu nm mmu ¶rt;u un uuu naa maua au am nu¶rt; 1,4 .

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Deep seismically active fracture zones in ecuador and northern peru     

Václav Hanuš  Jiří Vaněk  Reviewer J. Zahradník 《Studia Geophysica et Geodaetica》1987,31(1):8-25

Summary A system of 8 seismically active fracture zones was delineated on the basis of the distribution of earthquake foci in the continental lithosphere of Ecuador. The position and width of the outcrop, thickness, dip and maximum depth of the individual fracture zones were estimated and correlated with surface geological and tectonic phenomena, volcanism and hydrothermal manifestations. The existence and strike of the fracture zones was independently confirmed by the occurrence of historical disastrous earthquakes.

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Visiting professors at Instituto Geofísico and Facultad de Geología, Minas y Petróleos, Escuela Politécnica Nacional, Quito (Ecuador).  相似文献   

On the spiral structure of atmospheric vortices     

Vojtěch Vítek  Reviewer O. Zikmunda 《Studia Geophysica et Geodaetica》1982,26(2):173-175

a au au a ¶rt;am m ¶rt;uauu n¶rt;nu mau nua am u nu uu, m n amu n nua n uau mua mu.  相似文献   

Time pattern of large earthquake sequences in Europe in 1976–1979     

Vít Kárník  Zdeňka Schenková  Vladimír Schenk  Reviewer K. Pěč 《Studia Geophysica et Geodaetica》1982,26(1):42-58

Summary The time development of three large sequences, Friuli 1976, Thessaloniki 1978 and Monte Negro-Albania 1979, was investigated by analysing the characteristics of the time distribution of magnitudes of the events, M(t), of average magnitudes, (t), and of the number of events, n(t), as well as the strain release curves and the magnitude-frequency relations, N(M). The existence of time gaps and of an anomalous decay of the numbers of shocks before major events, as well as the oscillation of ( const b^–1) may be considered as precursory phenomena. The clustering of events has been tested by the Poisson and negative binomial laws.Communication presented at the XVIIth General Assembly of the European Seismological Commission in Budapest, 21–29 August, 1980 under the title Properties of Seismic Regime and Recent Earthquake Sequences in Europe.  相似文献   

Expansion of geoid heights over a triaxial earth's ellipsoid into a spherical harmonic series     

Karel Pěč  Zdeněk Martinec  Reviewer M. Burša 《Studia Geophysica et Geodaetica》1983,27(3):217-232

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Model of a cold-front “jump”     

Dagmar Novotná  Vojtěch Vítek  Reviewer O. Zikmunda 《Studia Geophysica et Geodaetica》1983,27(3):305-311

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Determination of Geopotential Differences between Local Vertical Datums and Realization of a World Height System   总被引：2，自引：0，他引：2  

Burša  Milan  Kouba  Jan  Müller  Achim  Raděj  Karel  True  Scott A.  Vatrt  Viliam  Vojtíšková  Marie 《Studia Geophysica et Geodaetica》2001,45(2):127-132

The methodology developed for connecting Local Vertical Datums (LVD) was applied to the Australian Height Datum (AHD) and the North American Vertical Datum (NAVD88). The geopotential values at AHD and NAVD88 were computed and the corresponding vertical offset of 974 mm with rms 51 mm was obtained between the zero reference surfaces defined by AHD and NAVD88. The solution is based on the four primary geodetic parameters, the GPS/levelling sites and the geopotential model EGM96. The Global Height System (or the Major Vertical Datum) can be defined by a geoidal geopotential value used in the solution as the reference value, or by the geopotential value of the LVD, e.g. NAVD88.  相似文献   

Preface     

Ivan Pšenčík  Vlastislav Červený  Luděk Klimeš 《Pure and Applied Geophysics》1996,148(1-2):1-1

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