Dr Johannes Obenholzner

Research Associate

Naturhistorisches Museum/Mineralogie
Postfach 417
A-1040 Wien
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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., 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’, Geological Society (UK) Special Publication, 213(1):123-148. 

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


Download our pamphlets on preparing for ashfall and on the health hazards of ash. They are designed for mass distribution at the onset of new eruptions. They are now avaiable in English, Japanese, French Spanish, Portuguese, Swahili, Indonesian and Icelandic with Italian versions being available shortly. Please see our Pamphlets page for further infomation.





IVHHN has an article under the Guidelines tab which used to be called 'Recommended Face Masks'. This has now been updated to 'Information on face masks' and is an interim page whilst the Health Interventions in Volcanic Eruptions project investigates which types of respiratory protection are effective in protecting the general population from volcanic ash inhalation. Please note that the translations in Spanish, Japanese and Portuguese have not yet been updated.



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