GLG 112 1st Edition Lecture 30Outline of Last Lecture C. HazardsIII. Pyroclastic FlowsA. What are they?B. Associated volcanoesC. HazardsD. ExamplesOutline of Current Lecture IV. LandslidesA. What is it?B. Associated volcanoC. ExampleV. LaharsA. What is it?B. Associated VolcanoC. HazardsD. ExamplesCurrent LectureThese 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.Landslides are loose material falling down a mountain. Earthquakes, loose material, and oversteepened slopes can trigger them.Composite Cones are often associated with landslidesEXAMPLE: Mt. St. Helens (eruption was triggered by a massive landslide). It had a hummocky (bumpy) terrain because of the landslides. It was the largest landslide in recorded history.Lahars are volcanic mudflows. They are the mixture of water and loose volcanic material. They come from explosive eruptions. The water can come from rain or the melted snow on ice from the mountain. They follow low topography and travel through river valleys until they hit flat ground and expand. They travel long distances.Lahars are mainly associated with Composite Cones.Hazards: high ground is safe. They are warm but not hot. They last for years.EXAMPLES:1. 1985 Nevado del Ruiz -composite cone in Columbia-city of Armero was destroyed overnight without warning-about 23,000 deaths2. Mt.
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