latest news: Volcanoes
Showing 8 of 88 Articles:
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Azores: Health hazards and disaster potential of ground gas emissions at Furnas volcano, Sao Miguel
Abstract: A health hazard assessment of exposure to soil gases (carbon dioxide and radon) was undertaken in the village of Furnas, located in the caldera of an active volcano. A soil survey to map the area of soil gas flow was undertaken, gas emissions were monitored at fumaroles and in eight houses, and a preliminary […]
Volcanoes -
New Zealand: Uptake of fluoride into developing sheep teeth, following the 1995 volcanic eruption of Mt Ruapehu
Abstract: In the southern Spring of 1995 (mid-October) the active volcano Mt Ruapehu in the central North Island of New Zealand erupted explosively, spreading up to 40 million m3 of rhyolite tephra over thousands of km2 of farmland during the lambing season. This ash contained a high concentration of soluble fluoride, and more than 2000 […]
New Zealand Volcanoes -
Chile: Evaluating a fluorosis hazard after a volcanic eruption
Abstract: The August, 1991 eruption of Mt. Hudson (Chile) deposited ash across southern Argentina and contributed to the deaths of thousands of grazing sheep. Early ash analysis revealed high levels of fluoride, a potential ash constituent toxic to humans and animals. In order to evaluate fluorosis as the cause of sheep deaths and to examine […]
Chile Volcanoes -
Hawaii: Characterization of air contaminants formed by the interaction of lava and sea water
Excerpts from article: … We also analyzed the impinger and silicagel sorbent tubes for anions of other inorganic acids including bromide, fluoride, nitrate, perchloric, phosphate, and sulfate. Of these, fluoride, nitrate, perchloric, and sulfate were identified in some samples collected from the sampling stations within the plume. Nitric and perchloric acids were below quantifiable levels […]
Volcanoes -
Hawaii: Dispersion of gaseous volcanogenic fluoride, island of Hawaii
Abstract: Fluoride was measured in samples of lichen collected in 1990 from 68 sites on the island of Hawaii; in addition, fluoride levels were measured in 8 rainfall samples collected at the same time. The levels of fluoride in the lichens range from 6 to 332 ?g g?1, which are similar to the levels measured […]
United States, Hawaii Volcanoes -
Sicily: Accumulation of volcanogenic fluoride by vegetation: Mt. Etna, Sicily
Abstract: Fluoride was measured in samples of lichen and grass collected in 1987 from over 50 sites on the slopes of Mt. Etna. Raised levels of fluoridewere detected on the downwind, eastern side, indicating that the volcano’s plume is the principal source of the fluorides. Lichens proved to be more sensitive than grasses in determining […]
Volcanoes -
Hawaii: Iridium Enrichment in Airborne Particles from Kilauea Volcano: January 1983.
Abstract: Airborne particulate matter from the January 1983 eruption of Kilauea volcano was inadvertently collected on air filters at Mauna Loa Observatory at a sampling station used to observe particles in global circulation. Analyses of affected samples revealed unusually large concentrations of selenium, arsenic, indium, gold, and sulfur, as expected for volcanic emissions. Strikingly large […]
Volcanoes -
Hawaii: Incrustations and fumarolic condensates at Kilauea volcano, Hawaii: field, drill-hole and laboratory observations
Abstract: Hawaiian volcanoes characteristically have but few of the many types of minerals found in incrustations of other volcanic areas. In Hawaii sulfates resulting from air oxidation of volatiles predominate, and fluorides produced during rock alteration by fumarolic gases are prominent. Halides are generally found where reducing conditions exist in fumaroles and lava lake drill […]
Volcanoes