El amigo Stefan R. de Alemania , me hace llegar esta interesante nota, la cual comparto con Uds. , siempre es importante mantenerse informado e informar y de esa manera tomar decisiones.Espero les sea útil.
Two new research results of volcano Chaitén:
1) Ph. D. Martin Reich (Departamento de Geologia, Facultad de Ciencias Fisicas y Matematicas, Universidad de Chile in Santiago) has published new research results about volcano Chaitén in magazine “Geology”.
He discovered that explosive volcanic eruptions release large amounts of finest particles into the atmosphere. These respirable particles are thinner than a human hair and enter directly into the lungs. Mr. Reich identified these particles by transmission electron microscopy as crystalline silica-ash particles (Cristobalite). CRISTOBALITE IS “DIÓXIDO DE SILICIO“.
This information is of utmost importance to assess the health risks of volcanic ash by short-term inhalation of ash during explosive volcanic eruptions and also long-term exposure in ash-covered areas. Mineral cristobalite has been previously in other studies identified as a health threat! Longer contact with mineral cristobalite has bad health effects, because the particles of cristobalite (“dióxido de silicio“) can cause silicosis or lung cancer many years after the inhalation!
(Illness silicosis: http://es.wikipedia.org/wiki/Silicosis )
2) Professor David Pyle (Department of Earth Sciences, University of Oxford, United Kingdom) analyzed the fallout and distribution of volcanic ash over Argentina in the “Journal of Geophysical Research”.
On May 2008 a team of scientists from the University of Oxford quickly travelled to Chaitén to check the distribution of ash from the eruption and to study its impacts on the local environment.
Now the team has shown in a new map that the several millimeters thickness of ash deposited across Argentina have been lost from wide areas in only nine months (50,000 square kilometers). The geologists were surprised by the enormous area of ash fallout. First they underestimated significantly the size of the eruption and the amount of ash erupted. By using satellite pictures they were able to map the ash fallout across Argentina to a thickness of less than one tenth of a millimeter.Traducción: