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Gaseous clue to impending eruption.

Gaseous clue to impending eruption

Several days before a major volcanic eruption near the Japanese city of Ito, distant scientific instruments detected significant changes that could help in predicting future volcanic activity there. The eruption occurred July 13, 1989, on the underwater Teishi knoll just off the coast from Ito. Forty kilometers to the southeast of the knoll lies a separate volcano called Izu-Oshima, where scientists had set up instruments to monitor the temperature of escaping gas. The gas temperature began to decrease 10 days before the eruption, and then dropped precipitously three days before the event, Japanese researchers report in the February GEOPHYSICAL RESEARCH LETTERS. They suggest the two volcanic systems are linked, raising the possibility that monitors placed at one site could provide an early warning of future eruptions at a distant volcano.
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Title Annotation:predicting future volcanic activity near Ito, Japan
Publication:Science News
Date:Mar 23, 1991
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