Preliminary radon measurements at Villarrica volcano, Chile

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• 作者：C. Cigolini ; M. Laiolo ; D. Coppola ; G. Ulivieri
• 关键词：Radon survey ; Villarrica volcano ; Fault zones ; Diffuse degassing
• 刊名：Journal of South American Earth Sciences
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：46
• 期：Complete
• 页码：1-8
• 全文大小：2077 K

文摘

We report data from a radon survey conducted at Villarrica volcano. Measurements have been obtained at selected sites by E-PERM^? electrets and two automatic stations utilizing DOSEman detectors (SARAD Gmbh). Mean values for Villarrica are 1600 (¡À1150)?Bq/m³ are similar to values recorded at Cerro Negro and Arenal in Central America. Moderately higher emissions, at measurement sites, were recorded on the NNW sector of the volcano and the summit, ranging from 1800 to 2400?Bq/m³. These measurements indicate that this area could potentially be a zone of flank weakness. In addition, the highest radon activities, up to 4600?Bq/m³, were measured at a station located near the intersection of the Liqui?e-Ofqui Fault Zone with the Gastre Fault Zone.

To date, the Villarrica radon measurements reported here are, together with those collected at Galeras (Colombia), the sole radon data reported from South American volcanoes. This research may contribute to improving future geochemical monitoring and volcano surveillance.