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# EARTHQUAKES

things that rumble !
by

## carsten mitchell

on 19 April 2010

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#### Transcript of EARTHQUAKES

Steps on how an earthquake occurs Steps:
1: Convevtion current moves plates.
2: Plates bump into eachother.
3: They keep pushing into eachother.
4: The plates build up pressure.
5: All pressure is released.
= Causing an earthquake (the shaking of Earths crust by a sudden release of energy) Elastic-rebound theory: the thoery that earhtquakes occur when the stress building up between two lithospheric plates overcomes the force of friction, causing the plates to suddenly move,release energy,and then snap back into thier former shapes. Focus: a point within the earth at which an earthqauke originates.
L wave: an earthqauke wave that travels along earths surface. Mohorovic discontinuity (moho): The boundry between earths crust and mantle. P wave: Primary earthqauke waves, that can travel through liquids and material. Richterscale: A numerical descripition of an earthqaukes magnitude. Seismic moment: A more accurate measurement of earthquake magnitude than the Richter Scale. Seismogram: The recording of an earthquake made by a seismograph; it records the time the earthquake takes place and the type and strength of the earthquake waves. Seismograph: An instrument that detects and records earthquakes. Shadow zone: A wide area around the earth on the side opposite the focus of an earthquake where neither P nor S waves can travel through. S waves: Secoundary, or shear, earthquake waves, which can travel through solids, but not liquids or gases. Time travel graph: A graph that shows the relationship btween P and S wave travel times and epicenter distence. Epicenter: Point on earths surface directly above the focus of an earthquake. EARTHQUAKES There are many kinds of things that cause an earthquake, well four, subduction, diverging, converging or collusion, and sliding boundaries.
Subduction is when an oceanic plate goes under a continental plate.
Diverging is when two continental plated split, or move apart from one another.
Converging or collusion is when two continetal plates hit into eachother.
Sliding is when two continental plates slide past one another, causing friction.
CARSTEN MITCHELL AND JAMES BAILEY
BLOCK: C
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