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CE 10-17 Earthquakes
WORD | DEFINITION |
---|---|
Earthquake | Vibrations in the earth caused by the sudden release of energy, usually a result of the movement of rocks along a fault. |
Crust | The earth's outer layer; the coolest and least dense layer of the earth |
Fault | A fracture in bedrock, along which blocks of rock on opposite sides of the fracture move. |
Mantle | The layer of earth that is beneath the crust. |
Lithosphere | The cool, solid outer shell of the earth. |
(lithospheric) plate | Masses of land that are floating on the earths mantle. |
Seismologist | A scientist who studies earthquake activity |
S-wave | The seismic wave vibrate side to side an up and down |
P-wave | The seismic wave that compresses and expand the ground |
Focus | The point beneath the earths surface at which rock under stress breaks and triggers an earthquake. |
surface wave | The slowest seismic waves that produce the most severe ground movements |
Epicenter | The point on the surface directly above the focus. |
Seismic Waves | Carry the energy of an earthquake away from the focus through the earths interior, and across the surface. |
Tsunami | The water displaced by an earthquake |
liquefaction | When an earthquakes violent shaking suddenly turns loose, soft soil into liquid mud. |
aftershock | An earthquake that occurs after a large earthquake in the same area. |
Base isoloters | These rods separate or isolate a building from its foundation and prevent some of the earthquakes energy from entering the building |
Shear core walls | Transfers some of a quakes energy from the roof and floors to the foundation |
cross bracing | Steel cross braces are placed between stories to stiffin a buildings frame and absorb energy during a quake |
mass damper/damper | Work like shock absorbers in a car to absorb some of the energy of seismic waves. |
flexible pipe | Water and gas pipes that have flexible joints that bend as energy passes through them greatly reducing damage. |
tension ties | Firmly tie the floors and walls to the buildings frame. |
magnitude | Is a measure of the size of an earthquake based on the amount of energy released by the earthquake based Richter Scale |
Stress | A force that acts on rock to change its shape or volume. |
Tension | Causes the crust to become thinner by stretching the crust. |
Compression | Squeezes the rock until it folds or breaks |
Strike-slip fault | Rocks on either side of a strike slip fault slip past each other. |
Normal Fault | In this fault the hanging wall slips down relative to the footwall |
reverse fault | In this fault the hanging wall moves up relative tot the footwall |
Anti cline | A fold of rock that bends upward into an arch. |
Sycline | A fold of rock that bends downward to form a valley. |
Plateau | A large area of flat land raised high above sea level. |
Hanging Walls | The block of rock that lies above the fault. |
Foot wall | The rock that lies below the fault. |
Shearing | Stress that pushes a mass of rock in two opposite directions. |
Mercalli Scale | Is used to measure the intensity of an earthquake. |
inner core | Is solid and seems to be made out of iron ant nickel. Is 1280 km or 800 miles thick. |
outer core | Is liquid and most likely made out of iron. About 2,000 km or 1,400 miles thick. |
Richter Scale | Measures the magnitude of an earthquake. |
basalt | The rock that covers most of the earths ocean floor |
granite | The rock that is in most of the earths crust. |
aesthenosphere | The part of the mantle below the rigid part is hot and is similar to taffy |
continental crust | The crust in land. |
oceanic crust | The crust under the ocean |
Divergent boundry | Where two tectonic plates divide. (diverge/divide) |
convergent boundry | Where two tectonic plates move together and collide(converge) |
transform boundry | Where two tectonic plates slide past each other.(strike slip fault) |
subduction zone | The place where denser oceanic crust slips under the less dense continental crust. |