A high sensitivity spinner magnetometer     

Vít Jelínek 《Studia Geophysica et Geodaetica》1966,10(1):58-78

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Catalogue of earthquakes and atlas of isoseismals for the Bohemian massif,the Carpathians and the Rhodope Mts     

Dana Procházková  Zdeňka Schenková  Vít Kárník  Reviewer K. Pěč 《Studia Geophysica et Geodaetica》1977,21(1):102-105

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Magnitude-intensity relations for European and mediterranean seismic regions     

Vít Kárníe 《Studia Geophysica et Geodaetica》1965,9(3):236-249

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Intensity—Distance relation for European earthquakes and its application     

Vít Kárník 《Studia Geophysica et Geodaetica》1965,9(4):341-349

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Preliminary studies on the geochemistry of the Cauvery river basin     

V Subramanian  L van t’ Dack  R van Grieken 《Journal of Earth System Science》1985,94(2):99-110

Samples of water and sediments were collected over a three year period from the entire region of Cauvery river basin excluding the estuary. On the basis of our observations, we have calculated the average composition of the Cauvery river at several locations from the catchment to the river mouth, the downstream profile of sediment load, annual erosion rates, solute and sediment fluxes and have predicted on long term changes. The sediment chemistry was determined by x-ray fluorescence (xrf) technique, and calculated mean compositions of the Cauvery and its tributary bed and the suspended sediment were compared to those of world average river sediments. Downstream profiles of some of the elements appear to be controlled by size and mineralogical characteristics besides local factors specific to the location of the samples. Interelemental relationships indicated good correlation among the transition elements indicating their co-genetic behaviour within the drainage basin.  相似文献   

Three-component spectral analysis of geomagnetic pulsations     

Jaroslav Střeštík  Reviewer M. Hvoždara 《Studia Geophysica et Geodaetica》1980,24(2):163-172

nua m¶rt; nma aaua a, umua m nma, m n¶rt;um umau nuau un nmam. m¶rt; annua aaum nauu Pi2 u Pc3 u amu u u ¶rt;. ¶rt;a ma m ¶rt; nmam nuau aamumu u u auum m aum amumu.  相似文献   

Long term mobilisation of chemical elements in tephra-rich peat (NE Iceland)   总被引：1，自引：0，他引：1  

Franois De Vleeschouwer  Brigitte Van Vliët Lano  Nathalie Fagel 《Applied Geochemistry》2008,23(12):3819-3839

This paper presents geochemical profiles of a tephra-bearing minerotrophic peat column from NE-Iceland obtained using various elemental analyses of the solid phase and the pore water. The influence of tephra grain size, thickness and composition of each tephra on the peat geochemistry was investigated. Interpretations are supported by a statistical approach, in particular by autocorrelation, and by microscopy observations. Minerotrophic peat geochemistry may be strongly dependent upon post-depositional mobilization and possible leaching of elements as demonstrated by Fe and trace metal concentration profiles. Chemical elements, and more specifically potentially harmful metals, can be slowly leached out of volcanic falls during their weathering and re-accumulate downwards. It is emphasised that a tephra deposit can act as an active geochemical barrier, blocking downward elemental movements and leading to the formation of enriched layers. In this study, the formation of poorly amorphous Fe phases above the Hekla 3 tephra is shown. These poorly crystalline Fe phases scavenged Ni.  相似文献   

Ständige Polnisch-Tschechoslowakische Zusammenarbeit bei der meteorologischen und Klimatischen Erforschung der Tatra     

Št. Petrovič 《Studia Geophysica et Geodaetica》1961,5(4):376-376

Ohne Zusammenfassung  相似文献   

Amount and type of derelict gear from the declining black pearl oyster aquaculture in Ahe atoll lagoon,French Polynesia     

Serge Andréfouët  Yoann Thomas  Cedrik Lo 《Marine pollution bulletin》2014

Pearl oyster aquaculture is a major activity in French Polynesia atoll lagoons. After the economic decline that characterized the last decade, concerns recently rose about discarded installations and materials that supported aquaculture practices and by facilities abandoned after they had to close their activities. In May 2013, a first inventory of the type and amount of pearl farms derelict gear (PFDG) was achieved on 47 sites in Ahe lagoon. Surveys were conducted within and outside the boundaries of aquaculture concessions. Twenty types of PFDG littered the lagoon floor and the water column. The most impacted areas were near abandoned grafting houses with up to nine types of PFDG. Forty-five percent of the sites were impacted, including outside concessions. While management authorities are fully aware of the problem, this first assessment is a wake-up call to stimulate the cleaning of lagoons, enhance awareness among farmers, and identify potential ecological consequences on lagoon ecosystems.  相似文献   

Scales of columnar jointing in igneous rocks: field measurements and controlling factors     

György Hetényi  Benoît Taisne  Fanny Garel  Étienne Médard  Sonja Bosshard  Hannes B. Mattsson 《Bulletin of Volcanology》2012,74(2):457-482

Columnar jointing is a common feature of solidified lavas, sills and dikes, but the factors controlling the characteristic stoutness of columns remain debated, and quantitative field observations are few in number. In this paper, we provide quantitative measurements on sizing of columnar joint sets and our assessment of the principal factors controlling it. We focus on (1) chemistry, as it is the major determinant of the physical (mechanical and thermal) properties of the lava, and (2) geology, as it influences the style of emplacement and lava geometry, setting boundary conditions for the cooling process and the rate of heat loss. In our analysis, we cover lavas with a broad range of chemical compositions (from basanite to phonolite, for six of which we provide new geochemical analyses) and of geological settings. Our field measurements cover 50 columnar jointing sites in three countries. We provide reliable, manually digitized data on the size of individual columns and focus the mathematical analysis on their geometry (23,889 data on side length, of which 17,312 are from full column sections and 3,033 data on cross-sectional area and order of polygonality). The geometrical observations show that the variation in characteristic size of columns between different sites exceeds one order of magnitude (side length ranging from 8 to 338 cm) and that the column-bounding polygons’ average order is less than 6. The network of fractures is found to be longer than required by a minimum-energy hexagonal configuration, indicating a non-equilibrium, geologically quick process. In terms of the development and characteristic sizing of columnar joint sets, our observations suggest that columns are the result of an interplay between the geological setting of emplacement and magma chemistry. When the geological setting constrains the geometry of the emplaced body, it exerts a stronger control on characteristic column stoutness. At unconstrained geometries (e.g. unconfined lava flows), chemistry plays the major role, resulting in stouter columns in felsic lavas and slenderer columns in mafic lavas.  相似文献