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Published byMolly Jacobs Modified over 8 years ago
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EARTHQUAKES Shake, Rattle and Roll! https://www.youtube.com/watch?v=CtBXTvtFaCU https://www.youtube.com/watch?v=VSgB1IWr6O4
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What is an Earthquake? The shaking, rolling or sudden shock of the earth’s surface Occur when rocks under stress suddenly shift along a fault. Rarely last even 1 minute yet are responsible for the greatest number of lives lost (and property damage) due to a natural event!
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Elastic Rebound Theory: Rocks that are strained past a certain point will fracture and spring back to original shape. As rock return to new positions, energy is dissipated into the surrounding medium through seismic waves
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Three Types of Faults Strike-SlipNormal Thrust
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Where do earthquakes occur? Is it random? Is any place safe or free of earthquakes?
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Epicenter vs. Focus
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Focus: Area along a fault where slippage first occurs. Deep in Earth Epicenter: Point on Earth’s surface directly above the focus.
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Earthquake Depths
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Major Earthquake Zones Most earthquakes occur along or near edges of the Earth’s lithospheric plates. Three Major Earthquake Zones: 1. Pacific Ring of Fire 2. Along mid ocean ridges 3. Eurasian-Melanesian mountain belt
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Major Earthquake Zones Pacific Ring of Fire
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Major Earthquake Zones Mid Ocean Ridge
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Major Earthquake Zones Eurasian-Melanesian Belt
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Fault Zones Groups of interconnected faults Form at plate boundaries because of great stress. Plates separate, collide, subduct or slide past each other. Ex. San Andreas Fault Zone
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Recording Earthquakes
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