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Earth Quakes
Question | Answer |
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Earthquake | Vibrations in Earth caused by the sudden release of energy, usually as 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, a long which blocks of rock on opposite sides of the fracture move. |
Mantle | The layer of the Earth beneath the crust. It is about 2900 km. thick, and it makes up about 83% of the Earth's interior. |
Lithosphere | The cool, solid outer shell of the Earth. It consists of the crust and the rigid uppermost part of the mantle and is broken up into segments, or plates. |
Lithospheric Plates | Ride on top of the Earth's crust. Large portions of crust. |
Seismologists | A scientist who studies Earthquakes. |
Epicenter | The point on the surface directly above the focus. |
Focus | The point at which a rock under stress breaks and triggers an earthquake. |
Seismic Waves | Vibrations that travel through Earth carrying the energy released during an Earthquake. |
P-Waves | Fastest moving waves that go forward and backward (push and pull). Causes buildings to contract and expand. |
S-Waves | Not the slowest or fastest moving waves. They go side to side. Shakes building from side to side. |
Surface Wave | Slowest moving waves that create violent ground movements. |
Seismograph | Records ground movements caused by seismic waves as they move through the Earth. |
Magnitude | A measurement of an Earthquake's strength. |
Richter Scale | Rates the amount of energy an Earthquake releases/ magnitude. |
Mercalli Scale | Rates the Earthquake based off how much damage is done. |
Moment Magnitude Scale | Rates how much energy is released by magnitude and damage. |
Tsunami | Water displaced by the earthquake may form a large wave. |
Liquefication | An earthquake's violent shaking suddenly turns loose, soft soil into liquid mud. |
Aftershock | An earthquake that occurs after a large earthquake in the same area. |
Base Isolators | Isolates a building from its foundation and prevent some of an earthquake's energy from entering the building. |
Shear Corewalls | Transfers some of a quake's energy from roofs and floors to the building's foundation. |
Tension Ties | These devices firmly "tie" the floors and ceilings of a building to walls. They absorb and scatter earthquake energy and thus reduce damage. |
Cross Braces | Places between stories to stiffen a building's frame and absorb energy during an earthquake. |
Dampers | Work like the shock absorbers in a car to absorb some of the energy of siesmic waves |
Flexible Pipe | When an earthquake happens it moves around without breaking, keeping gasses and water in. |
Tension | When an earthquake happens the rock stretches out. |
Compression | When an earthquake happens the rock gets squeezed together and up. |
Shearing | When the earth brakes. |
Plateau | Flat ground that has been pushed up from an earthquake. |
Normal Fault | A fault in witch the hanging wall has moved down relative to the foot wall. |
Reverse Fault | A fault in witch the hanging wall has moved up relative to the foot wall. |
Strike- Slip Fault | When the earths crust move horizontally. |