Unlike most geohazards, volcanic eruptions are often preceded by warning signs, including increased seismicity, ground deformation, degassing, or thermal emissions from hours to months (or even years) before eruption (e.g., UNESCO, 1971). Such preeruptive unrest is defined as "the deviation from the background or baseline behavior of a volcano towards a behavior which is a cause for concern in the short-term because it might prelude an eruption" (Phillipson et al., 2013). Implicit in this definition of unrest is a quantification of
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