期刊
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
卷 173, 期 1-2, 页码 113-121出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jvolgeores.2007.12.040
关键词
thermal water; volcanic eruption; eruption monitoring; volcanic activity; Usu volcano
Mt. Usu is a stratovolcano located on the southern side of the Toya caldera in Hokkaido, Japan. In historical times it emitted dacitic products associated to remarkable crustal deformations. Usu volcano erupted on March 31st 2000 after 23 yr of dormancy and this eruption was the fourth in the 20th century. Secular variations in water levels, temperature and chemical compositions of thermal water have been observed around Usu volcano. The water levels decreased since October 1999, 6 months prior to the eruption. The decrease in water levels is a precursory change and is probably due to leakage of thermal water from the shallow aquifer hosting it. No variations in temperature and chemical composition of thermal water were evident prior to the eruption. However, in a few wells, the temperature of the thermal water increased by up to 15 degrees C with respect to the pre-eruptive values. Moreover, the concentration of some solutes (Na, K, Cl and SO4) became higher after the eruption. These thermal and chemical changes are ascribable to increased input of a deep hydrothermal liquid into the shallow groundwater aquifer. (C) 2008 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据