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Volcanoes and Quakes

Definitions

QuestionAnswer
Epicenter Point on Earth's surface directly above an earthquake's focus.
Fault Fracture that occurs when rocks break and that results in relative of compression(reverse fault), being pulled apart (normal fault), or shear (strive-slip fault)
Focus Point deep inside Earth where enrgy is released, causing an earthquake.
Lava Monlten rock flowing onto Earth's surface
Lithosphere Rigid layer of Earth about 100km thick, made of the crust and apart of the upper mantle.
Magnitude A measure of the energy released by an earthquke.
Rifts Long crack, fissure, or through that forms between tectonics
Magnitude Describes the abilty of structures to stand up agian the vibrations caused by an earthquake.
Seismic Waves Earthquake waves, including primary waves.
Surface Waves When the water in the ocean in it gets higher and higher near the land.
Seismograph Instrument used to record seisemicwaves. Secondart waves, known as S-waves move through rock material by causing particles in the rock to vibrate right angle to the direction in which the waves are moving. P-and S- waves trave; through Earth's interior.
Tsunami Powerful seismic sea wave that begins over an ocean-floor earthquake, can reach 30m in height when approaching land, and can cause destruction in coatal areas.
Volcanoes Cone-shaped hill or mountain formed when hot magma , solid and gas erupt onto Earth's surface through a vent.
Pyroclastic Flow Pyroclastic flpws are another hazard for inhabitsnts of Montaerrat.
Ritcher Scale Richer magnitude is based on measirements of amplitudes, or heights of seismic waves as recored on seismographs.
Created by: rosalind135
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