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Earthquakes
chapter.2
27
Science
8th Grade
12/03/2008

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Term
Tension
Definition
Stress that stretches rock so that it becomes thinner in the middle.
Term
Compression
Definition
Stress that squeezes rock until it folds or breaks.
Term
Stress
Definition
A force that acts on rock to change its shape or volume.
Term
Shearing
Definition
Stress that pushes a mass of rock in two opposite dirtections.
Term
Normal faults
Definition
Tension in earths crust pulls rock apart.
Term
Hanging wall
Definition
The block of rock that lies above the noraml fault.
Term
Footwall
Definition
The rock that lies below the hanging wall.
Term
Reverse fault
Definition
The same structure as a normal fault.
Term
Strike-slip fault
Definition
Rocks on either side of the fault slip past each other sideways.
Term
Anticline
Definition
A fold in rock that bends upward into arch.
Term
Syncline
Definition
A fold in rock that bends downward to form a valley.
Term
Plateau
Definition
A large flat area of flat land elevated high above sea level.
Term
Earthquake
Definition
Shaking and trembling that results from the movement of rock beneath earths surface.
Term
Focus
Definition
the area beneath earths surface where Rock is under stress breaks, triggering a earthquake.
Term
Epicenter
Definition
The point on the surface directly above the focus.
Term
Surface waves
Definition
They move more slowly than p waves and s waves.
Term
Mercalli scale
Definition
Developed tp rate earthquakes according to the level of damage.
Term
Magnitude
Definition
A number or sign to earthquakes based on the size.
Term
Richter scale
Definition
rating of an earthquakes magnitude based on size of the seismic waves.
Term
Seismograph
Definition
What seismic wave are measrured by.
Term
Moment magnitude scale
Definition
Rating system that estimates the total energy released by an earthquake.
Term
Seismogram
Definition
The record of earthquakes seismic waves produced by a seismograph.
Term
Friction
Definition
Force that opposes the motion of one surface as it moves across another surface.
Term
Liquefaction
Definition
Occurs when an earthquakes violent shaking suddenly turns loose, soft soil into liqiud mud.
Term
Aftershock
Definition
Is is an earthquake that occursafter a larger earthquake in the same area.
Term
Tsunami
Definition
The water displaced by the earthquake may form a large wave called a tsunami.
Term
Base islolated building
Definition
Is a designed to reduce the amount of energy that reaches the building during an earthquake.
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