GLG 112 1st Edition Lecture 29Outline of Last Lecture II. Tephra A. What is it?B. Associated volcanoesC. Hazards Outline of Current Lecture C. HazardsIII. Pyroclastic FlowsA. What are they?B. Associated volcanoesC. HazardsD. ExamplesCurrent LectureIf you are more than 3km away from the vent there are a few other things you need to be worried about with tephra. They are the following:- Ash inhalation (especially in people with bad asthma)- Eye irritation from ash- Visibility problems- Water contamination (drinking)- Crop failure- Kills aquatic life- FloodingThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Disrupts transportation/shipping- Clogs air filters (cars don’t drive)- Clogs turbines (no electricity)- Abrasive- Roof collapse is the #1 cause of death due to tephraPyroclastic flows are dense clouds of hot volcanic debris and gases. They flow down the volcano at about 100mph. They travel across both land and water.Pyroclastic flows are associated with composite cones (andesite) and calderas (rhyolite). These are the most lethal part of the eruption because they incinerate everything in their path.EXAMPLES1. Mt. Pelee (1902) - Composite cone- Destroyed the town of St. Pierre- 30,000 killed but 2 men survived- One was in a dungeon jail cell- The other was in a house on the edge of the flow2. Mt. Vesuvius (79 AD)- Italy- Killed
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