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Ryan Evans Earthquakes
earthquakes
23
Science
7th Grade
03/04/2014

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Term
Fault
Definition
When rocks break they move along surfaces called faults
Term
Earthquake
Definition
Is the vibrations produced by breaking rock
Term
normal fault
Definition
rock above fault surface moves downward in relation to rock below fault
Term
reverse fault
Definition
surface is forced up and over the rock
Term
strike-slip fault
Definition
rocks on either side of the fault are moving past each other
Term
seismic wave
Definition
pressure wave generated by an earthquake
Term
focus
Definition
point underground where earthquake begins
Term
epicenter
Definition
point on earth's surface right above the focus
Term
primary waves
Definition
fastest underground
Term
secondary waves
Definition
next fastest underground
Term
surface waves
Definition
slowest, travel on surface, most destructive
Term
seismograph
Definition
instrument used to measure earthquakes
Term
magnitude
Definition
strength of earthquake
Term
Richter scale
Definition
measurement of earthquake magnitude
Term
Liquefaction
Definition
when ground acts like a liquid during an earthquake
Term
tsunamis
Definition
large wave caused by earthquake
Term
where did the largest earthquake occur?
Definition
California
Term
how many earthquakes occur each year?
Definition
500,000
Term
how many of them could be felt
Definition
100,000
Term
what percent does that represent
Definition
20%
Term
largest earthquake ever recorded
Definition
chile
Term
deadliest earthquake
Definition
china
Term
How about 10
Definition
extremely rare
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