Dr Johannes ObenholznerResearch Associate Naturhistorisches Museum/Mineralogie Research Expertise
Characterization of tephra and aerosols with special interest in barite (barium sulphate). Recently, work has focused on characterization of aerosols from Popocatepetl, Solfatra, Etna and Vulcano, using the FESEM/EDS technique. The images and spectra obtained are available for use by other researchers (please contact Johannes directly). Field emission scanning electronmicroscopy analysis is performed at the Zentrum fuer Elektronenmikroskopie, Technical University of Graz, Austria in cooperation with P. Poelt and H. Schroettner. See also: www.felmi-zfe.at.
Relevant Publications
Obenholzner, J.H. and Heiken, G. 1999. Pyroclast relict textures in the Triassic Rio Fontanaz Tuff - similarities of vesiculation and fragmentation with the Quarternary Campanian Ignimbrite. Acta Vulcanol., Vol. 11 (2) 283-292. Obenholzner. J.H., Schroettner, H. Golob, P., Delgado, H. 2003. Particles From the Plume of Popocatepetl Volcano, Mexico - the FESEM/EDS approach. Submitted to Geological Society (UK) Special Publication, eds. C. Oppenheimer & D. Pyle (Cambridge): VOLCANIC GASES - in press Obenholzner, J.H., Schroettner, H., Delgado, H. 2003. Barite aerosol particles from volcanic plumes and fumaroles - FESEM/EDS analysis. EGS-AGU-EUG, Nice 2003.
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Latest News
We are proud to announce the publication of two pamphlets on volcanic ash fall hazards. They are designed for mass distribution at the onset of new eruptions. They are now avaiable in English, Japanese, French Spanish, Portuguese and Swahili with Italian versions being available shortly. Please see our Pamphlets page for further infomation.
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