Word: magnitude5
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Dates: during 1981-1981
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...volcano will cooperate by keeping quiet. But will it? Geologists are reluctant to forecast the future. Reconstructing last year's disaster with readings from seismographs and tiltmeters - which measure the swelling of the earth's surface - scientists have determined that the eruption was triggered by a magnitude5 earthquake that shook the mountain on May 18, the day of the volcano. The tremor dislodged a flank of the mountain already swollen from rising semimolten rock. A huge hunk of the mountain rumbled downhill like a great sliding door, uncovering rock saturated with compressed gases. Exposed...
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