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__NOTOC__ COLOR-CODE CONDITIONS, LONG VALLEY CALDERA AND MONO-INYO CRATERS REGION, CALIFORNIA Developed in 1997 to replace a previous 5-level system devised in 1991 . LEVEL OF CONCERN COLOR CODES FOR VOLCANOES IN ALASKA Established during the 1989 - 90 eruption of Redoubt Volcano . WARNING SYSTEM FOR CASCADE RANGE VOLCANOES IN WASHINGTON AND OREGON Introduced following the May 18 , 1980 , Eruption of Mount St. Helens . EXTERNAL LINK |
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