ENV 4521 Lecture Notes - Lecture 15: Weathering, Natural Hazard, Asthenosphere
24 Jun 2019
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Document Summary
Physical weathering: disintegrates rocks into gravel and sand: chemical weathering: decomposes rock into clay materials, earthquake the shaking of the earth by seismic waves radiating away from a disturbance, most commonly a fault movement. Magnitude an assessment of the size of an event. Magnitude scales exist for earthquakes, volcanic eruptions, hurricanes and tornadoes. For earthquakes, different magnitudes are calculated for the same earthquake when different types of seismic waves are used. Mitigation actions taken by humans to minimize the possible effects of a natural hazard. A process of heat transfer whereby hot material at depth rises upward due to its lower density while cooler material above sinks because of its high density. Return period amount of time between an event of a given size. Giant long period sea waves caused by oceanic disturbances such as fault movements, volcanic eruptions, meteorite impacts, and landslides.
