Word: nevado
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Dates: during 1990-1999
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...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 del Ruiz in 1985 and 1987 and multiple eruptions of Alaska's Redoubt. Seismometers positioned at Pinatubo have recorded similar seismic patterns...