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Earthquakes
Upshur
22
Science
7th Grade
03/04/2014

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Cards

Term
When rocks break they move along...
Definition
faults
Term
vibration produce by breaking rock
Definition
earthquake
Term
Tension forces
Definition
normal
Term
compression forces
Definition
reverse
Term
Shear forces
Definition
Strike-slip
Term
seismic waves
Definition
pressure wave generates by an earthquake
Term
focus
Definition
point underground where earthquakes starts
Term
epicenter
Definition
point on earth's surface above the focus
Term
primary wave
Definition
fastest wave, underground
Term
secondary wave
Definition
next fastest wave, underground
Term
surface wave
Definition
slowest wave, but most destructive
Term
seismograph
Definition
instrument used to measure the size and location of an earthquake
Term
magnitude
Definition
strength of the earthquake
Term
ritcher scale
Definition
measurments of earthquake magnitude
Term
liquifaction
Definition
when the ground acts like liquid during an earthquake
Term
seismic waves
Definition
pressure wav generates by an earthquake
Term
how many earthquakes occur each year
Definition
500,000
Term
how mant earthquakes can be felt
Definition
100,000
Term
what % does this represent
Definition
20%
Term
where was the largest earthquake recorded
Definition
Chile
Term
Where was the most deadly earthquake
Definition
Central China
Term
How often to 10 earthquakes occur
Definition
extemely rare
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