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Increased volcanic activity had prompted fears a major eruption was imminent.
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The scale runs from zero to five -a major eruption.
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It produced a major eruption about 2000 years ago.
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A major eruption from Mount Sakurajima, in south-western Japan, could happen in the next 30 years.
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How close is it to a major eruption?
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Etna's last major eruption occurred in 1992.
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The last major eruption of the 2,003-meter-tall Volcano Calbuco was in 1961.
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Eight thousand people remain displaced after a major eruption of Papua New Guinea's Mt Ulawun volcano last month.
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Its last major eruption in 1963 killed around 1 600 people.
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The probe has already found volcanic rock from a major eruption 15,000 years ago.
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The ash fall has worsened the plight of over 8000 people still displaced by Ulawun's major eruption in June.
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Photo: Supplied to RNZ Tipene Maangi is one of eight people missing on the island after the major eruption yesterday.
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The volcano erupted again at the weekend, following another major eruption in June which prompted mass evacuations from nearby villages.
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About 5000 people living on Papua New Guinea's volcanic Manam Island are reluctant to evacuate after the weekend's major eruption.
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In 2004, a major eruption forced the evacuation of some 9,000 people from the island.
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A major eruption occurs about once every 100,000 years.
