Word: chouet
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Dates: during 1991-1991
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...Tilling's colleagues, geophysicist Bernard Chouet, believes he may have found an answer to this dilemma. Prior to many large-scale eruptions, he says, seismometers have picked up tremors that appear to be caused, not by the fracturing of rock, but by low-frequency waves that resonate through the magma itself. While their origin remains a mystery, these vibrations may result from small surges of gas and molten rock. Large numbers of such signals preceded Mount St. Helens' 1980 blast. They also appeared before the unexpected explosion of Mexico's El Chichon in 1982, the blowup of Colombia's Nevado...
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