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The western part of the Bohemian Massif is characterized by repeated occurrences of intraplate earthquake swarms. To study surface deformations of this anomalous region, a network covering about 2000 square kilometres for repeated geodetic measurements was established in 1993 - 1994. The positions of the individual points of the network were carefully picked with respect to local tectonic structure and earthquake foci distribution. GPS and precise levelling measurements were performed 1-2 times a year. The GPS data were processed by Bernese GPS software.
No tendency to any displacement - either horizontal or vertical - of geological blocks was derived from the geodetic data for the period 1993 - 96. Only displacements of less than 5 mm/year in average could occur in the whole region in that period; larger displacements would have been revealed by our measurements. 相似文献
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Jindra Cekan 《GeoJournal》1993,30(2):147-151
Agropastoralists in northern Mali, as elsewhere, feel the effects of seasonal changes. These mixed farmer-herders respond to some changes and pre-empt others. Their economic, social and nutritional structures adapt to changes in climate in order to control its effects on their fields, herds and families. Some decisions are taken individually, others as households and still others as village councils. In February to June 1991, the author interviewed male elders in village councils and groups of women and youth in 24 villages across northern Mali. This paper focuses on five of these villages in the Mourdiah Nara area of north-central Mali where the author travelled in late March, early April 1990. The author explores the strategies to cope with the dry season and proposes those strategies which may be most suitable for development into assistance programmes.Ph. D. Program, The Fletcher School of Law and Diplomacy, Medford, MA 02155 USA. This research was carried out under the aegis of Mali's Systeme d'Alerte Precoce (early warning system), the Pew Charitable Trust Scholars Program (USA) and the University of Cambridge African Studies Centre (UK). Many thanks to Alex Kremer of UK's Natural Resources Institute/ODA and Aminata Simpara, my interpreter. An earlier, narrower version of this paper appeared inDisasters 3 (1992). 相似文献
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Emel’yanov N. V. Arlot J.-E. Zhang X. L. Bradshaw J. De Cat P. Han X. L. Ivantsov A. Jindra J. Maigurova N. Manek J. Pauwels T. Pomazan A. Vingerhoets P. 《Solar System Research》2019,53(6):436-442
Solar System Research - Photometric observations of satellites during their mutual occultations and eclipses are a valuable source of astrometric data for studying the motion of natural planetary... 相似文献
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