Abrupt changes of hydrothermal activity in a lava dome detected by combined seismic and muon monitoring.

ABSTRACT: The recent 2014 eruption of the Ontake volcano in Japan recalled that hydrothermal fields of moderately active volcanoes have an unpredictable and hazardous behavior that may endanger human beings. Steam blasts can expel devastating ejecta and create craters of several tens of meters. The management of such hydrothermal events in populated areas is problematic because of their very short time of occurrence. At present no precursory signal is clearly identified as a potential warning of imminent danger. Here we show how the combination of seismic noise monitoring and muon density tomography allows to detect, with an unprecedented space and time resolution, the increase of activity (at timescales of few hours to few days) of a hydrothermal spot located 50 to 100 m below the summit of an acti

SUBMITTER: Le Gonidec Y 

PROVIDER: S-EPMC6395750 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature