Slide 1. Earth Science. Chapter 5 Earthquakes
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1 Slide 1 Earth Science Chapter 5 Earthquakes
2 Slide 2 Forces in Earth's Crust A force that acts on rock to change its shape or volume is stress 3 types of stress acting on rock layers Tension pulls on the crust Compression squeezes rock Shearing pushes a mass of rock in two opposite directions.
3 Slide 3 Types of Force
4 Slide 4 Faults & Folds Fault - a break in the rock layer of the crust where rock surfaces slip past each other. Fold Forces on the rock layer are not fast or strong enough to break or snap the rock but simply bends the rock layer
5 Slide 5
6 Slide 6 Fault Types & Land Forms When two reverse faults cut through a block of rock, fault movements may push up a fault-block (typed lecture notes are wrong) When two normal faults cut through a block of rock, fault movements may push up a rift valley
7 Slide 7 Rock Layers That Fold Caused by Compression type forces A fold in rock that bends upward into an arch is an anticline. A fold in rock that bends downward to form a valley is a syncline. Anticlines synclines
8 Slide 8 Earthquake!! A shaking and trembling that results from the sudden movement of part of the Earth s crust. Similar to ripples from a pebble in a pond Usually occur along a fault More than 1 million per year on the planet Entire fault doesn t all move at the same time. Energy is released at different places at anyone time
9 Slide 9 Earthquake Terms Focus: (aka hypocenter) the point underground where the release of stress is located Epicenter: the point on the earth s surface directly above the focus Aftershock: an earthquake that occurs after a larger earthquake in the same area. Liquefaction: earthquake's violent shaking suddenly turns loose, soft soil into a liquid-like slurry. Seismic waves: carry energy from an earthquake away from the focus P waves S waves L waves
10 Slide 10 Seismic Waves Primary Waves: P waves 1. Fastest moving of the waves 2. Travel through solid, liquids and gases 3. Push-pull type of wave Secondary Waves: S Waves 1. Second to arrive 2. Travel through solid but not liquid or gas 3. S shaped waves 4. Rock particles move at right angles to the direction of the wave Surface Waves: L Waves 1. Slowest moving of the waves 2. Travel across the surface of the Earth 3. Originate on the earth s surface 4. Cause the most damage of all the waves
11 Slide 11 Primary Waves: P waves
12 Slide 12 Secondary Waves: S Waves
13 Slide 13 Surface Waves: L Waves
14 Slide 14 Seismic Wave Movements P waves travel thru solid & liquid. P waves arrive first then come the S waves S waves reflect off the liquid outer core
15 Slide 15 Earthquake Strength & Intensity Richter Scale - rating of an earthquake's magnitude based on the size of the earthquake's seismic waves ( 1 10) Mercalli Scale - rate earthquakes according to the level of damage at a given place. ( I XII) Moment Magnitude Scale - rating system that estimates the total energy released by an earthquake
16 Slide 16 Richter Scale Most commonly used scale Each number represents a magnitude 10x greater than previous number.
17 Slide 17 Seismograph A Seismograph detects and measures intensity of the earthquake A Record of an earthquake is a seismogram
18 Slide 18 Mercalli Scale rate earthquakes according to the level of damage at a given place. ( I XII)
19 Slide 19 Tsunamis Tidal Wave Tsunami - a large water wave caused by an under sea earthquake. When an earthquake jolts the ocean floor, plate movement causes the ocean floor to rise slightly and push water out of its way. Tsunamis
20 Slide 20 That s it!! Let s go home.
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