click below
click below
Normal Size Small Size show me how
Set 1
earthquakes
Term | Definition |
---|---|
Earthquake | vibrations in the 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, along which blocks of rock on opposite sides of the fracture move. |
Mantle | The layer of the earth beneath the crust. |
Lithosphere | The cool, solid outer shell of the earth. |
Lithospheric plates | The layer of the mantle that lies directly below the lithosphere. |
Seismologists | A scientist who studies earthquakes. |
P-waves | A primary earthquake wave that travels through the body of the earth. |
S-waves | A secondary earthquake. |
Surface waves | An earthquake wave that travels on or near the surface of the earth. |
Focus | The location where the rupture of an earthquake begins and energy is released. |
Epicenter | The point on the surface of the earth directly above the focus of the earthquake. |
Richter Scale | A scale that rates an earthquake's magnitude. |
Moment-magnitude | The moment magnitude scale is used by seismologists to measure the size of earthquakes in terms of the energy released. |
mercalli scale | The Mercalli intensity scale is a seismic scale used for measuring the intensity of an earthquake. |
seismic waves | an elastic wave in the earth produced by an earthquake or other means. |
magnitude | the great size or extent of something. |
seismograph | an instrument that measures and records details of earthquakes, such as force and duration. |
Liquefaction | Liquefaction is a phenomenon in which the strength and stiffness of a soil is reduced by earthquake shaking or other rapid loading. |
aftershcock | a smaller earthquake following the main shock of a large earthquake. |
tsunami | a long high sea wave caused by an earthquake, submarine landslide, or other disturbance. |
Base Isolator | A building mounted on bearings designed to absorb the energy of an earthquake |
Shear core walls | shear walls in the center of a large building — often encasing an elevator shaft or stairwel |
Tension Ties | Helps you fasten down bookshelf etc. during in earthquake |
Cross bracing | cross bracing is a system utilized to reinforce building structures in which diagonal supports intersect. |
Mass damper | A mechanical device to dissipate kinetic energy of seismic waves penetrating a building structure. |
Flexible pipes | flexible pipes that help keep the foundation |
compression | the reduction in volume (causing an increase in pressure) of the fuel mixture in an internal combustion engine before ignition. |
stress | pressure or tension exerted on a material object. |
tension | the state of being stretched tight. |
strike-slip fault | a fault in which rock strata are displaced mainly in a horizontal direction, parallel to the line of the fault. |
normal fault | A geologic fault in which the hanging wall has moved downward relative to the footwall. |
reverse fault | A geologic fault in which the hanging wall has moved upward relative to the footwall. |
shearing | break off or cause to break off, owing to a structural strain. |
San andreas fault | n active strike-slip fault in W United States, extending from San Francisco to S California and forming the on-land portion of the western margin of the North American Plate. |
plateau | a land area having a relatively level surface considerably raised above adjoining land on at least one side, and often cut by deep canyons. |
hanging wall | the underside of the wall rock overlying a vein or bed of ore. Compare |
foot wall | a mass of rock lying beneath a fault plane. |
antilcline | an anticlinal rock structure. |
syncline | a synclinal fold. |
asthenosphere | |
mantle | |
crust | |
Inner core | |
outer core | |
Lithosphere |