The past 18th May marked 39 years since one of the most emblematic volcanic eruptions in historic times: the 1980 Mt St Helens explosive eruption. With a death toll of 57 victims, it is the deadliest volcanic event in U.S. history. If that wasn’t enough, it also destroyed hundreds of houses and roads. When we think about explosive volcanic eruptions what commonly comes in our minds about the possible related hazards are impressive Pyroclastic Density Currents (PDC) or Lahars (a glossary below), mainly because of their quick deadly potential, moving ashfall to a secondary role in producing hazards to population.
However, ashfall can be hazardous too even affecting people’s health in the long term and in distal areas from the volcano itself. In today’s post, we will go through how the fall of volcanic ash can be a hazard that must be taken into account by people living in the close (and sometimes not-too-close) neighbourhood of an active volcano. [Read More]