19 agosto 2015
Researchers discovered an increase in a helium isotope during a 10-year period before the 2014 Mount Ontake eruption in central Japan. The finding suggests that this helium isotope anomaly is related to activation of the volcano’s magma system and could be a valuable marker for long-term risk mitigation concerning volcanic eruption.
http://www.sciencedaily.com/releases/2015/08/150819083136.htm
