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Dietmar Mller, Belinda Brown, Takemi Ishihara, and Sergey Ivanov.
In early April, excursionists noted the appearance of sulfurous vapors emitting from fumaroles near the mountaintop.
This was not regarded as important, as fumaroles had been appearing and disappearing in the past.
"Tephra" and "pyroclastics" are general terms used in reference to particles of igneous rock material of various sizes that have been ejected from volcanoes. The terms "ash" and "dust" communicate a specific size of tephra or pyroclastic particles. At first glance, volcanic ash looks like a soft, harmless powder.
Instead, volcanic ash is a rock material with a hardness of about 5 on the Mohs Hardness Scale.