Publication Date:
2001-04-09
Description:
Magmatic carbon dioxide (CO2) degassing has been documented before the 31 March 2000 eruption of Usu volcano, Hokkaido, Japan. Six months before the eruption, an increase in CO2 flux was detected on the summit caldera, from 120 (September 1998) to 340 metric tons per day (September 1999), followed by a sudden decrease to 39 metric tons per day in June 2000, 3 months after the eruption. The change in CO2 flux and seismic observations suggests that before the eruption, advective processes controlled gas migration toward the surface. The decrease in flux after the eruption at the summit caldera could be due to a rapid release of CO2 during the eruption from ascending dacitic dikes spreading away from the magma chamber beneath the caldera.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hernandez, P A -- Notsu, K -- Salazar, J M -- Mori, T -- Natale, G -- Okada, H -- Virgili, G -- Shimoike, Y -- Sato, M -- Perez, N M -- New York, N.Y. -- Science. 2001 Apr 6;292(5514):83-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory for Earthquake Chemistry, Graduate School of Science, University of Tokyo, Bunkyo-Ku 113-0033, Tokyo, Japan. phdez@iter.rcanaria.es〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11292867" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
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Chemistry and Pharmacology
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Computer Science
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Medicine
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Natural Sciences in General
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Physics
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