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Term | Definition |
---|---|
earthquake | moments of the ground due to sudden release of energy |
focus | point in earths interior where the earthquake occurred |
seismic waves | waves of energy released by an earthquake |
epicenter | point on earths surface difectly above the focus |
elastic rebound | sudden return of deformed rock back to unformed shape |
body waves | seismic waves that move through the inside of earth |
p waves | push pull body waves |
s waves | side to side waves |
surface waves | seismic waves that move on earths surface |
seismograph | all waves are recored on a seimograph |
seismogram | pen traces vibrations onto a moving drum of paper to crete a seismogram |
richter scale | numerical scale based on height of largest seismic wave magnitude |
moment magnitude scale | small shallow quakes |
modified mercalli scale | roman numeral scale that measures the intansity creating by an earthquake |
liquefaction | phenomeron sometimes assoicate with earthquakes in which soils and other materials come with water and turn into a liquid that is not supported |
tsunami | is a wave formed when the ocean floor shifts suddenly during a earthquake |
seismic graph | a graph that reads how big a earthquake is. |
crust | the thin , rocky outer layer of earth is divided into oceanic and continetal crust |
mantle | 82 percent of earths volume is contained in the mantle a solid , rocky shell. |
outer core | is a sphere having a radius of 1220 kilometers |
inner core | are compressed into a solid state by the immense pressure |
moho | short for mohorovicic discontinuity |
ring of fire | a major area in the basin of the pacific ocean |
hot spot | volcanic areas far from plate boundaries |
viscosity | the state of being thick, sticky, and semifuid in consistency |
vent | an opening as in a wall, an opening at the earths surface from volcanic material |
pyroclastic material | composed of rock fragments of explosive orgin |
volcano | opening vent that allows magma to escape to the surface |
crater | a crater thats in the ground bowl shape cavity in the ground or on the surface |
shield volcano | quiet eruptions of basaltic lava |
cinder cone | explosive eruption of grantic lava |
composite volcano | combination of forms lands |
caldera | a large volcanic crater typically one formed by a major eruption leading to the collaspe of the mouth of the volcano |
lahar | a destructive mudflow on the slopes of a volcano |
pluton | a body of a intrusive rock |
sill | a sheet of igneous rock intruede between and parallel with the existing strata |
laccolith | a mass of igneous rock typically lens shaped that has been intruded between rock. |
dike | a ditch or water course |
batholith | a very large igneous intrusion extending deep in the earths crust |