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volhaz&pred - Volcanic Hazards and Prediction EENS 204...

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This page last updated on 05-Feb-2007 EENS 204 Natural Disasters Tulane University Prof. Stephen A. Nelson Volcanic Hazards & Prediction of Volcanic Eruptions Volcanic Hazards This lecture will begin with a video entitled "Understanding Volcanic Hazards". This video was prepared by the International Association of Volcanology and Chemistry of the Earth's Interior in several languages, and was designed show people living in the vicinity of volcanoes the possible effects of an eruption. Although the terminology may vary slightly from what we have learned in this course, the effects are the same and the footage of volcanic eruptions in progress is spectacular. The video is dedicated to the 23,000 people who died as a result of mudflows (lahars) from the 1985 eruption of Nevado del Ruiz volcano in Columbia, and is intended to help prevent similar disasters in the future. The video covers: z Ash Falls (tephra falls) z Hot Ash Flows (pyroclastic flows) z Mudflows (lahars) z Volcanic Landslides (debris flows and debris avalanches) z Lava Flows z Volcanic Gases Primary Effects of Volcanism z Lava Flows { Lava flows are common in Hawaiian and Strombolian type of eruptions, the least explosive. { Although lava flows have been known to travel as fast as 64 km/hr, most are slower and give people time to move out of the way. { Thus, in general, lava flows are most damaging to property, as they can destroy anything in their path. { Control of lava flows has been attempted with limited success by bombing flow fronts to attempt to divert the flow, and by spraying with water to cool the flow. Volcanic Hazards and Prediction 2/5/2007 Page 1 of 9
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