Wave phenomena on blocks — A schlieren model study     

Jan Kozák  Ludvík Waniek  Reviewer V. Červený 《Studia Geophysica et Geodaetica》1975,19(4):350-357

  相似文献   

Special Contribution: Pictorial Series of the Manifestations of the Dynamics of the Earth: 6. South Pacific and Antarctica - the Last Explored Regions     

Kozák  J.  Guterch  A.  Venera  Z. 《Studia Geophysica et Geodaetica》2004,48(3):661-671

Studia Geophysica et Geodaetica -  相似文献   

Special Contribution: Pictorial Series of the Manifestations of the Dynamics of the Earth: 3. Historical Images of Landslides and Rock Falls     

Kozák  Jan  Rybář  Jan 《Studia Geophysica et Geodaetica》2003,47(1):221-232

Studia Geophysica et Geodaetica -  相似文献   

Macroseismic information from historic pictorial sources     

Jan Kozák  John E. Ebel 《Pure and Applied Geophysics》1996,146(1):103-111

Prephotographic depictions of earthquakes can contain important information on the types and amount of damage due to a large earthquake in historic times. Care must be used in evaluating such depictions because some are more accurate than others, and many depictions contain little that is of value in making estimates of seismic intensity. Depictions of two earthquakes, in 1692 at Jamaica and in 1843 at Guadeloupe, illustrate the utility of depictions in intensity estimation. A depiction of the scene at Port Royal in Jamaica of the 1692 shock suggests that the major damage was caused by soil slumping and a tsunami, with the ground shaking itself probably only having been about MMI VII. Two depictions of Pointe-à-Pitre at Guadeloupe after the 1843 event contain evidence that the town was damaged by strong ground shaking as well as by major soil failures. The ground shaking here was probably MMI VII–IX. These and other pictures are being assembled for a monograph of prephotographic earthquake depictions in the Americas.  相似文献   

Contact conditions on seismoactive faults     

Blahoslav Košťák  Jan Kozák  Tomáš Lokajíček 《Pure and Applied Geophysics》1984,122(5):680-693

Square plate models with a diagonally located slit in compression were studied photoelastically. The resulting stress field surrounding the discontinuity (slit) is evaluated before and after seismoactive (seismic-energy-releasing) shear displacement. The mechanism of the fast shear movement (stick-slip), including its radiation properties, in interpreted. The results confirm the existence of a central locked zone in the loaded slit, the limits of which coincide with the initiation points of stick-slip movements. The zone is interpreted as the source of the seismic energy release. The complementary measurements (direct optical and ultrasonic) are presented to verify the results of the photoelastic analysis. The results obtained are discussed in regard to the conclusions that follow from the theory of elasticity.  相似文献   

Sustainability aspects of thermal water production in the region of Hajdúszoboszló-Debrecen,Hungary     

Tamás Buday  Péter Szűcs  Miklós Kozák  Zoltán Püspöki  Richard William McIntosh  Erika Bódi  Béla Bálint  Kornél Bulátkó 《Environmental Earth Sciences》2015,74(12):7511-7521

  相似文献   

Toxicity of the organophosphate pesticide diazinon to crayfish of differing age     

M. Buřič  A. Kouba  J. Máchová  I. Mahovská  P. Kozák 《International Journal of Environmental Science and Technology》2013,10(3):607-610

Diazinon is a widely applied agricultural pesticide whose effect importantly on the environment and the possible contamination of surface waters has led to increased interest in toxicological studies. Crayfish, as an ecologically important benthic macroinvertebrate, seems to be an appropriate model organism for such assessments. Acute toxicity tests were carried out on three crayfish age groups: young-of-the-year (total length = 25.0 ± 4.9 mm), juvenile (total length = 56.5 ± 3.8 mm) and adult (total length = 83.5 ± 5.7 mm). Young-of-the-year crayfish were found to be the most sensitive to diazinon (96 h LC50 = 0.15 mg L^?1), followed by juvenile crayfish (96 h LC50 = 0.27 mg L^?1), and adults (96 h LC50 = 0.51 mg L^?1). Crayfish were highly sensitive to diazinon. A delayed effect of Diazinon 60EC on adults was detected (144 h LC50 = 0.44 mg L^?1) suggests functional damage from the use of sublethal concentrations.  相似文献   

Eclogite–gneiss complex of the Muya block (East Siberia): age,mineralogy, geochemistry,and petrology     

V.S. Shatsky  E.S. Sitnikova  A.A. Tomilenko  A.L. Ragozin  O.A. Koz’menko  E. Jagoutz 《Russian Geology and Geophysics》2012,53(6):501-521

Results of study of eclogite–gneiss complex of the Muya Block (East Siberia) are presented. Several structural types of the studied eclogites have been recognized. Kyanitic eclogite has been found for the first time. The host granite-gneisses are two-mica and biotite varieties, mainly garnet-bearing. The exposure of eclogites from different depths of the subducted plate at the present-day denudation level might be the reason for the wide range of the equilibrium temperatures of the Muya block eclogites (590–740 °C). The Sm–Nd dating of the eclogites and host gneisses showed the Neoproterozoic age of high-pressure metamorphism (～630 Ma). The model age (T_DM) of the eclogites (720 Ma) differs considerably from the model age of the host gneisses (>1.3 Ga). The geochemical features of the eclogites point to the mobility of LILE (Rb, Cs, Ba, K) and LREE during their interaction with fluids, whereas the gneisses in the same process showed the mobility of LILE only. The oxygen isotope composition of minerals in the eclogites varies over a narrow range (δ¹⁸O = 5.5–3.9) and is close to the average mantle value, which evidences a negligible interaction between the eclogite protoliths and meteoric or sea water. The study of fluid inclusions in quartz from the eclogites and host gneisses showed a predominance of liquid-nitrogen inclusions in the former and carbon dioxide inclusions in the latter.  相似文献   

Seismogeodynamics of the Aldan-Stanovoi block     

L. P. Imaeva  V. S. Imaev  B. M. Koz’min 《Russian Journal of Pacific Geology》2012,6(1):1-12

New geological-structural, seismological, seismotectonic, land geodetic, and GPS data were summirized to study the general geodynamic position of the Aldan-Stanovoi block, its recent structural-tectonic patterns, and the tendencies in the structural formation of active faults in the heterogeneous field of tectonic stresses determined by the interaction between the Eurasian and Amur lithospheric plates in southern East Siberia (Transbaikal region), southern Yakutia, and the Amur region.  相似文献   

Designs and test results for three new rotational sensors     

P. Jedli?ka  J. T. Kozák  J. R. Evans  C. R. Hutt 《Journal of Seismology》2012,16(4):639-647

We discuss the designs and testing of three rotational seismometer prototypes developed at the Institute of Geophysics, Academy of Sciences (Prague, Czech Republic). Two of these designs consist of a liquid-filled toroidal tube with the liquid as the proof mass and providing damping; we tested the piezoelectric and pressure transduction versions of this torus. The third design is a wheel-shaped solid metal inertial sensor with capacitive sensing and magnetic damping. Our results from testing in Prague and at the Albuquerque Seismological Laboratory of the US Geological Survey of transfer function and cross-axis sensitivities are good enough to justify the refinement and subsequent testing of advanced prototypes. These refinements and new testing are well along.  相似文献