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G. Green
Earthquakes
26
Science
7th Grade
03/04/2014

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Cards

Term
Faults
Definition
Surfaces
Term
Earthquake
Definition
The vibrations produced by the breaking of rock
Term
Normal fault
Definition
Rock above the fault surface moves downward in relation to rock below the fault surface
Term
Reverse fault
Definition
Rock is forced up and over the rock below the fault surface
Term
Strike-slip fault
Definition
Rocks on either side of the fault are moving past each other without much upward or downward movement
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 (size and location)
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 an earthquake
Term
t/f. a normal fault is when the rock is forced up and over the rock below the fault surface
Definition
false
Term
t/f. seismic waves are large waves caused by an earthquake
Definition
false
Term
t/f. an epicenter is the point on earth's surface right above the focus
Definition
true
Term
t/f. primary waves are the fastest waves
Definition
true
Term
Where did the largest recent earthquake (over 4.5 on Richter scale) occur?
Definition
California
Term
How many earthquakes occur each year?
Definition
500,000
Term
How many of them can actually be felt?
Definition
100,000 which is 20%
Term
Where was the largest earthquake ever recorded?
Definition
Chile
Term
Where was the world's most deadly earthquake?
Definition
Central China
Term
How often do earthquakes with a magnitude between 8.0 and 8.9 occur each year?
Definition
1 per year
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