Shared Flashcard Set

Details

Hines
Earthquakes
26
Science
7th Grade
03/06/2014

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Cards

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 uses to measure earthquakes (size and location)
Term
magnitude
Definition
strength of earthquakes
Term
Richter scale
Definition
measurement of earthquake magnitude
Term
liquefaction
Definition
when ground acts like a "liquid" during an earthquake
Term
tsunami
Definition
large wave caused by an earthquake
Term
True or False
surface waves are the fastest
Definition
false
Term
True or False
epicenter is the instrument used to measure an earthquake
Definition
false
Term
True or False
magnitude is strength of the earthquake
Definition
true
Term
True or False
focus is the point underground where earthquakes begin
Definition
true
Term
fault
Definition
place where rocks break
Term
earthquake
Definition
vibrations caused by breaking rocks
Term
normal fault
Definition
found at divergent boundary - plates pull together
Term
reverse fault
Definition
found at convergent boundary - plates push together
Term
strike-slip fault - found at transform boundary - plates slide past each other
Definition
Term
Where did the largest recent earthquake (over 4.5 on Richter scale) occur?
Definition
Northern California
Term
How many earthquakes occur each year
Definition
500,000
Term
How many of them can actually be felt
Definition
100,000
Term
What percent does that represent
Definition
20%
Term
Where was the largest earthquake ever recorded
Definition
9.5
Term
Where and when was the world's most deadly earthquake
Definition
Chile on May 22,1960
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