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Investigations on volcanic risk in Lanzarote. II- Some observational methods

AuthorsFernández Torres, José ; Vieira, Ricardo
Issue Date1991
PublisherCouncil of Europe
CitationComptes rendus, Journées Luxembourgeoises de Géodynamique, 1991: 56-59
AbstractThe variation of any parameter related to the Earth geodynamics is as much influenced by external causes to the earth surface as by internal ones, besides the possible instrumental effects. The elimination of the first and the last ones in the considered parameters (sea level, grav1ty, deformations, etc.) would leave us as data the variations produced by geodynamical phenomena internal to Earth, among which we can find the volcanic activity previous to an eruption, concreted in masses movements at a very high temperature. \/ith sea level data we can try to detect vertical deformations of the crust; with gravimetric records the gravity variations produced on the surface; with cllnometric ones the inclinations produced by deformations, etc. To clearly distinguish volcanic phenomena from other possible ones, 1t would be suitable to have at our disposal the maximum and most diversified information possible.
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