文章基本信息

标题：Descent of tremor source locations before the 2014 phreatic eruption of Ontake volcano, Japan
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作者：Masashi Ogiso ; Hirotoshi Matsubayashi ; Tetsuya Yamamoto 等
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2015
卷号：67
期号：1
页码：1-12
DOI：10.1186/s40623-015-0376-y
出版社：Springer Verlag
摘要：On 27 September 2014, Ontake volcano, in central Japan, suddenly erupted without precursory activity.We estimated and tracked the source locations of volcanic tremor associated with the eruption at high temporal resolution, using a method based on the spatial distribution of tremor amplitudes.Although the tremor source locations were not well constrained in depth, their epicenters were well located beneath the erupted crater and the summit.Tremor sources were seen to descend approximately 2 km over a period of several minutes prior to the beginning of the eruption.Detailed analysis of the time series of tremor amplitudes suggests that this descent is a robust feature.Our finding may be an important constraint for modeling the 2014 eruption of Ontake volcano as well as for monitoring activities on this and other volcanoes.
关键词：Tremor location; Migration; Mechanism of phreatic eruption; Volcano monitoring; Ontake volcano