Went to a weird little theater in a rehabbed mill in Lowell, Mass., a real hipster's paradise. Saw "Love and Fire" about the Krafft's, two married French volcanologists who spent over twenty years studying active volcanos together.
They resist some of the classifications used by geologists, insisting that each volcano should be studied as an individual. They do make a distinction between "red" volcanos and "grey" volcanos(like Mt. Helens), the greys being more destructive, explosive and unpredictable.
Their warning to the government of the Philippines of an impending eruption allowed the evacuation of the surrounding villages, sparing the massive loss of life.
The Kraffts died together when a volcano in Japan they were filming erupted unexpectedly in June, 1991.
After watching this, my wife turned to me and told me she had climbed an active volcano once, before we were married. I was as surprised by this as if she had told me she had once robbed a bank.